Professor Jonathan Tammam
BSc MSc PhD RD RNutr FHEA
Director Centre for Nutrition and Health, and Programme Lead in Nutrition and Dietetics
School of Sport, Nutrition and Allied Health Professions
Role
I joined OBU in 2019 as both Programme (Academic) Lead and Director of the Centre for Nutrition and Health. I am actively involved in education, applied research, and commercial consultancy. I hold a Doctorate in intermediary metabolism, a Masters with distinction in nutrition and dietetics, and a Bachelors in Applied Biology. Professionally, I am a Registered Nutritionist with the Association for Nutrition and a Registered Dietitian with the Health and Care Professions Council. I am a member of the Nutrition Society and British Dietetics Association. Moreover, I hold Fellowships with the Higher Education Academy and Institute of Food Brain and Behaviour.
Areas of expertise
- Randomised Controlled Trials
- Nutrition intervention
- Public Health Nutrition
- Quantitative Research
- Prison food
- Adolescent diet
- Dietetics
Teaching and supervision
Courses
- Applied Human Nutrition (MSc, PGDip, PGCert)
- Dietetics (Pre-Registration) (MSc, PGDip)
- Nutrition (BSc (Hons))
- Nutrition Science (Final Year Entry) (BSc (Hons))
Modules taught
I am Module Leader for 'Nutrition Research Project', a final year module where students have the opportunity to immerse themselves in a genuine research project under the supervision of an experienced academic.
I also contribute to the teaching in 1st year, 2nd year, and MSc modules, and supervise both BSc and MSc research projects.
Programme Lead for Nutrition and Dietetics:
- Oversee the strategy, development, and operations of the BSc, MSc, and PhD Nutrition and Dietetics programmes.
- Manager to multidisciplinary team of academic staff.
Other experience:
- External examiner for the MSc in Public Health Nutrition at Liverpool John Moores University.
- Mentor for the Council of Deans Leadership programme
Supervision
I am on the supervisory team to two PhD students:
- Matt Poulter who is investigating Diet, Nutrition, and Health in UK prisons.
- Francesca Tabacchi who is investigating malnutrition in obese cancer patients.
I am available for proposals to supervise further PhD students either externaly- or self-funded.
Research Students
Name | Thesis title | Completed |
---|---|---|
Francesca Tabacchi | Nutritional support in cancer patients during treatment. | Active |
Matt Poulter | Diet, Nutrition, and Health in UK prisons | 2024 |
Research
My research interest focus on the nutritional needs of prisoners and adolescents, groups often ignored within a public health context. I have led randomised controlled trials within prison and school settings, exploring the effect of supplementary nutrition on behaviour. Subsequent to that I have investigated the provision and choice of prison food and how it compares with recommended dietary guidance. I also have a research interest in how TV food advertising is misaligned with healthy eating guidance. Additionally I am interested in the gender disparity within the Nutrition and Dietetics profession, and malnutrition screening and assessment in clinical dietetics. I currently co-supervise a research assistant investigating malnutrition screening in obese cancer patients.
Research grants and awards
Co-applicant Research Excellence Awards (2021 and 2022) funded project investigating the assessment of malnutrition in overweight and obese cancer patients.
Centres and institutes
- Oxford Institute of Applied Health Research
- Oxford Brookes Centre for Nutrition and Health
- Centre for Healthy Living Research
Projects as Principal Investigator, or Lead Academic if project is led by another Institution
- KTP with the Institute for Food, Brain and Behaviour (29/01/2024 - 28/09/2026), funded by: Technology Strategy Board (Innovate UK), funding amount received by Brookes: £309,913
Projects as Co-investigator
- Formulation and validation of Reducose as a functional food ingredient to reduce risk of diabetes(01/09/2023 - 28/02/2026), funded by: Technology Strategy Board (Innovate UK), funding amount received by Brookes: £169,024, funded by: Technology Strategy Board (Innovate UK)
Publications
Journal articles
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Poulter M, Coe S, Graham CA-M, Leach B, Tammam J, 'Menu Provision in a Young Offenders Institution, Comparison with Dietary Guidelines, and Previous Menu Allocation: A cross sectional Nutritional Analysis.'
Journal of Nutritional Science 13 (2024)
ISSN: 2048-6790 eISSN: 2048-6790AbstractPublished here Open Access on RADARObjective: This study aimed to assess and comparatively analyse two menus from a Young Offenders Institution (YOI), one from 2019 and 2022, identifying any improvements in meeting dietary guidelines. Design: Cross-sectional and comparative analysis. Setting: United Kingdom, a YOI in Northern England. Participants: YOI Menus. Results: A total of 30 dietary components were analysed, of these, 25 were exceeding the dietary guidelines (pConclusion: The 2022 menu has demonstrated progress towards meeting dietary guidelines and particularly with reducing calories, fat, saturated fat, salt, sodium, and chloride, as well as increasing vitamin D. Though improvements are seen, calories, free sugars, salt, saturated fat, sodium, and chloride are still exceeding dietary guidelines, posing as potential health risks.
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Thondre PS, Butler I, Tammam J, Achebe I., Young E, Lane M, Gallagher A, 'Understanding the Impact of Different Doses of Reducose® Mulberry Leaf Extract on Blood Glucose and Insulin Respons-es after Eating a Complex Meal: Results from a Double-Blind, Randomised, Crossover Trial'
Nutrients 16 (11) (2024)
ISSN: 2072-6643 eISSN: 2072-6643AbstractPublished hereNon-communicable diseases (NCDs) are becoming an increasingly important health concern due to a rapidly ageing global population. The fastest growing NCD, type 2 diabetes mellitus (T2DM), is responsible for over 2 million deaths annually. Lifestyle changes, including dietary changes to low glycemic response (GR) foods, have been shown to reduce the risk of developing T2DM. The aim of this study was to investigate whether three different doses of Reducose®, a mulberry leaf extract, could lower the GR and insulinemic responses (IR) to a full meal challenge in healthy individuals. A double-blind, randomised, placebo-controlled, repeat-measure, crossover design trial was conducted by the Oxford Brookes Centre for Nutrition and Health; 37 healthy individuals completed the study. Participants consumed capsules containing either 200 mg, 225 mg, 250 mg Reducose® or placebo before a test meal consisting of 150 g white bread and egg mayo filler. Capillary blood samples were collected at 15-min intervals in the first hour and at 30-min intervals over the second and third hours to determine glucose and plasma insulin levels. The consumption of all three doses of Reducose® resulted in significantly lower blood glucose and plasma insulin levels compared to placebo. All three doses of Reducose® (200 mg, 225 mg, 250 mg) significantly lowered glucose iAUC 120 by 30% (p = 0.003), 33% (p = 0.001) and 32% (p = 0.002), respectively, compared with placebo. All three doses of Reducose® (200 mg, 225 mg, 250 mg) significantly lowered the plasma insulin iAUC 120 by 31% (p = 0.024), 34% (p = 0.004) and 38% (p ® can be used to help lower the GR and IR of a full meal containing carbohydrates, fats and proteins.
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Yousefi Rad E, Saboori S, Tammam J, Thondre PS, Coe S
, 'The effect of Niacin on inflammatory markers and adipokines: A systematic review and meta-analysis of interventional studies'
European Journal of Nutrition 63 (2024) pp.2011-2024
ISSN: 1436-6207 eISSN: 1436-6215AbstractPublished here Open Access on RADARPurpose.
Niacin (Nicotinic acid), known for its lipid-modifying effects, has been explored for its potential anti-inflammatory properties and potential to affect adipokines secretion from adipose tissue. The aim of this systematic review and meta-analysis was to assess the effects of Niacin on inflammatory markers and adipokines.
Methods.
A comprehensive search was conducted across five databases: PubMed, Scopus, Cochrane Library, Embase, and ISI Web of Science. Randomized controlled trials exploring the effects of Niacin on inflammatory markers (CRP, IL-6, TNF-α) and adipokines (adiponectin, leptin) were included. Pooled effect sizes were analysed using a random-effects model, and additional procedures including subgroup analyses, sensitivity analysis and dose-response analysis were also performed.
Results.
From an initial 1279 articles, fifteen randomized controlled trials (RCTs) were included. Niacin administration demonstrated a notable reduction in CRP levels (SMD: -0.88, 95% CI: -1.46 to -0.30, p = 0.003). Subgroup analyses confirmed CRP reductions in trials with intervention durations ≤24 weeks, doses ≤1000 mg/day, and elevated baseline CRP levels (>3mg/l). The meta-analysis of IL-6 and TNF-α revealed significant TNF-α reductions, while IL-6 reduction did not reach statistical significance. Niacin administration also substantially elevated adiponectin (SMD: 3.52, 95% CI: 0.95 to 6.1, p = 0.007) and leptin (SMD: 1.90, 95% CI: 0.03 to 3.77, p = 0.04) levels.
Conclusion.
Niacin treatment is associated with significant reductions in CRP and TNF-α levels, suggesting potential anti-inflammatory effects. Additionally, Niacin positively influences adipokines, increasing adiponectin and leptin levels. These findings provide insights for future research and clinical applications targeting inflammation and metabolic dysregulation.
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Poulter M, Coe S, Graham CA-M, Leach B, Tammam J, 'A Systematic Review of the effect of Dietary and Nutritional Interventions on the Behaviours and Mental Health of Prisoners'
British Journal of Nutrition 132 (1) (2024) pp.77-90
ISSN: 0007-1145 eISSN: 1475-2662AbstractPublished here Open Access on RADARPrisoners experience a higher burden of poor health, aggressive behaviours and worsening mental health than the general population. This systematic review aimed to identify research that used nutrition-based interventions in prisons, focusing on outcomes of mental health and behaviours. The systematic review was registered with PROSPERO on the 26th of January 2022: CRD42022293370. Inclusion criteria comprised of current prisoners with no limit on time, location, age, sex, or ethnicity. Only quantitative research in the English language was included. PubMed/Medline, Web of Science, EMBASE, PsycINFO, and CINAHL were searched, retrieving 933 results, with 11 included for qualitative synthesis. Studies were checked for quality using the ROB 2 or ROBINS-I tool. Of the included studies, seven used nutritional supplements, three included diet changes, and one used education. Of the seven supplement-based studies, six included rule violations as an outcome, and only three demonstrated significant improvements. One study included mental health as an outcome, however, results did not reach significance. Of the three diet change studies, two investigated cognitive function as an outcome, with both reaching significance. Anxiety was included in one diet change study, which found a significant improvement through consuming oily fish. One study using diet education did not find a significant improvement in overall mental resilience. Overall, results are mixed, with the included studies presenting several limitations and heterogeneity. Future research should aim to consider increased homogeneity in research design, allowing for a higher quality of evidence to assess the role nutrition can play in improving the health of prisoners.
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F. Tabacchi, V. Iatridi, J. Tammam, E. Watson & S. Coe, 'Case report on a multidisciplinary approach to address malnutrition and improve a patient’s fitness for treatment'
Nutrition and Cancer [online first] (2024)
ISSN: 0163-5581 eISSN: 1532-7914AbstractPublished here Open Access on RADARApproximately 5,700 people are diagnosed with myeloma each year in the UK. The standard of care is to receive an autologous stem cell transplant after completion of induction therapy. There are no specific dietary recommendations for people with myeloma, however they are at risk of malnutrition due to symptoms and side effects of treatments. This report describes the journey of a 73-year-old male diagnosed with immunoglobulin A (IgA) lambda myeloma in April 2021. The patient lost 23% of his body weight during 6 months of systemic anti-cancer treatment (SACT), resulting in postponing his transplant twice due to reduced fitness. This report describes an effective, although late, multidisciplinary intervention which was successful for the patient who managed to reestablish a healthy weight and good quality of life. The patient received his transplant in January 2023. This case highlights two important aspects of patient care that should not be underestimated in dietetic clinical practice: early screening and multidisciplinary collaboration. Monitoring the nutritional status of patients and providing early nutrition support can prevent hospital admissions, treatment delays and reduce the associated costs. Multidisciplinary teamwork can improve patient care and clinical outcomes, and it is fundamental to strengthen communication and collaboration among clinical disciplines.
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Somayeh Saboori, Esmaeil Yousefi Rad, Jonathan Tammam, Pariyarath Sangeetha Thondre, Shelly Coe, 'Effects of Niacin on apolipoprotein A1 and B levels: A systematic review and meta-analysis of Randomised Controlled Trials'
British Journal of Nutrition [online first] (2023)
ISSN: 0007-1145 eISSN: 1475-2662AbstractPublished here Open Access on RADARNiacin has been investigated for its potential impact on lipid metabolism and cardiovascular health. This meta-analysis aims to systematically evaluate the effects of Niacin interventions on apolipoprotein A1 (Apo A1) and apolipoprotein B (Apo B) levels, key regulators of lipoprotein metabolism and markers of cardiovascular risk. A comprehensive search of the literature was performed on five databases of PubMed, Scopus, Web of Science, Embase and Cochrane library, from inception up to 15 July 2023. This search identified 1452 publications, from which 12 randomized controlled trials (RCTs) met the inclusion criteria. The intervention dosages ranged from 500 to 3000 mg/day, and the study durations spanned 6 to 102.8 weeks. The Niacin intervention demonstrated a significant reduction in Apo B levels (WMD: -24.37 mg/dl, p = 0.01). Subgroup analyses indicated that intervention duration played a role, with trials of ≤16 weeks showing a greater reduction in Apo B. Regarding Apo A1, Niacin significantly increased its levels (WMD: 8.23 mg/dl, p 1500 mg/day (p
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Perreau C, Desailly F, Grard S, Thondre PS, Ahlstrom L, Tammam J, Wils D, 'Slow Digestible Starch in Native Pea Starch (Pisum sativum L.) Lowers Glycemic Response with No Adverse Effects on Gastrointestinal Symptoms in Healthy Adults'
Journal of Medicinal Food 26 (10) (2023) pp.760-767
ISSN: 1096-620X eISSN: 1557-7600AbstractPublished here Open Access on RADARDiabetes prevalence achieved 470B in 2021. Diabetics are looking for foods that allow them to better manage the postprandial glycemia. Owing to its large amylose fraction, pea starch may contribute to formulate recipes with a lower glycemic index (GI). This study measured the rapidly, slowly digested and resistant fractions in pea starch and in a powder mix recipe. Starch fractions were determined according to the Englyst methodology. A nonblind repeat measure crossover design trial in healthy humans was used to study the GI of pea starch and maltodextrin powder mix recipes against glucose. Gastrointestinal symptoms were measured. Thirteen healthy volunteers aged 18–60 years with body mass index
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Tabacchi F, Iatridi V, Tammam J, Watson E, Coe S, 'Under-identification of cancer outpatients at risk of malnutrition: are we making the most of anthropometric data?'
Future Healthcare Journal 9 (3) (2022)
ISSN: 2055-3323 eISSN: 2055-3331AbstractPublished here Open Access on RADARIn oncological outpatient settings, patients often require nutritional support after they have developed malnutrition. A delayed dietetic referral can lead to increased difficulties in providing therapies and surgery, and to poorer patient outcomes. The audit described in this article aimed to assess the frequency and completeness of patient record documentation of anthropometric measurements in a day treatment unit (DTU) in a single cancer centre in the UK. The underlying goal was to improve anthropometry monitoring procedures to ensure that documentation is sufficient to indicate weight loss and, hence, allow timely referrals for nutrition support. The results show that, for over 80% of patients, it was not possible to identify a weight trend between the latest two treatments received at the hospital. The audit findings highlight the need to improve malnutrition monitoring and to ensure patient records contain updated and accurate anthropometric measurements in order to facilitate medical staff to recognise early malnutrition risk and refer for appropriate nutritional support when needed.
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Fallaize R, Moyo V, Tammam J, Draper J, Lovegrove J. , 'Objective assessment of dietary exposure and cardiometabolic risk in homeless adults'
Proceedings of the Nutrition Society 80 (OCE1) (2021)
ISSN: 0029-6651 eISSN: 1475-2719AbstractPublished here -
Bello F, Tammam J, 'Comparison of daytime TV food adverts with the Eatwell Guide'
Journal of Human Nutrition and Dietetics 33 (S1) (2020) pp.19-20
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Morley B, Leach B, Tammam J, 'Food available to people in prison from the prison shop: Comparison to dietary guidelines'
Journal of Human Nutrition and Dietetics 33 (S1) (2020) pp.61-62
ISSN: 0952-3871 eISSN: 1365-277XPublished here -
Harrison PD, Mellor D, Tammam J, 'Gender disparity within dietetics in the UK: experiences and opinions of male students and professionals'
Journal of Human Nutrition and Dietetics 33 (S1) (2020) pp.24-25
ISSN: 0952-3871 eISSN: 1365-277XPublished here -
Tremarco L, Abbott L, Tammam J, 'Qualitative exploration of the practices of and attitudes towards breastfeeding, of perinatal women, in three anonymised UK prisons'
Journal of Human Nutrition and Dietetics 33 (S1) (2020) pp.66-
ISSN: 0952-3871 eISSN: 1365-277XPublished here -
Lewis K., Madden A, Tammam,J, Tzilivakis J, Vafeiadou K, 'Final evidence report as part of preparatory work for the setting of Dietary Reference Values for sodium and chloride'
EFSA Journal 16 (4) (2019)
ISSN: 1831-4732AbstractPublished hereAs part of its mandate from the European Commission, EFSA must review existing advice from the Scientific Committee for Food (SCF) on Dietary Reference Values (DRVs) for energy, macro‐ and micronutrients and other substances with a nutritional or physiological effect, including sodium and chloride. As part of preparatory work for this task, this part of the report summaries current general scientific information for the micronutrients sodium and chloride. Data has been collated via a literature review of published, peer reviewed scientific literature from two online databases: Google Scholar and PubMed. Information contained within a total of 146 documents for sodium and 85 documents for chloride has been evaluated and included. As well as describing the methodological approach, this report covers the occurrence, geology and chemistry of sodium and chloride; approaches to and limitations of the chemical analysis of clinical samples; the biological functions of sodium and chloride and an overview of the health consequences of sodium and chloride deficiency. In addition, sodium and chloride physiology and metabolism in healthy adults, biomarkers of intake, status and function and genotypes affecting metabolism are covered.
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Tammam J, Mellor D , Moore G, Treacy J, Cirstescu V, Karfopoulou E, 'Gender and ethnicity representation in nutrition and dietetics professional publications'
Journal of Human Nutrition and Dietetics 32 (Suppl. 1) (2019) pp.29-
ISSN: 0952-3871 eISSN: 1365-277XPublished here -
Njekwa B, Leach B, Tammam J, 'Macronutrient analysis of food provision and prisoners’ food choices in an adult male UK Prison'
Journal of Human Nutrition and Dietetics 32 (Suppl. 1) (2019) pp.23-24
ISSN: 0952-3871 eISSN: 1365-277XPublished here -
Chrisostomou C, Leach B, Njekwa B, Karfopoulou E, Tammam J, 'Micronutrient analysis of food provision and prisoner choice in an adult male UK prison compared to healthy eating guidelines'
Journal of Human Nutrition and Dietetics 32 (Suppl. 1) (2019) pp.16-17
ISSN: 0952-3871 eISSN: 1365-277XPublished here -
Abbott L, T Preston T, Tammam J, 'Pregnant women’s opinions of the food provided in prison'
Journal of Human Nutrition and Dietetics 32 (Suppl. 1) (2019) pp.15-
ISSN: 0952-3871 eISSN: 1365-277XPublished here -
Chipperfield F, Tammam J, 'A content analysis of the proportion of food groups advertised on television compared to those recommended in the Eatwell Guide'
Journal of Human Nutrition and Dietetics 31 (Suppl. 1) (2018)
ISSN: 0952-3871 eISSN: 1365-277XAbstractPublished hereBackground: 28% of children in England between 2 and 15 yr are overweight or obese. TV adverts significantly influence children's food choice. Food and drink products high in fat salt and sugar (HFSS) are subject to TV scheduling and adver tising restrictions. However, this does not apply to family pro grammes which also have a high number of child viewers. This study aims to identify whether the proportions of food groups advertised on peak-time family television meet recom mendations for a healthy balanced diet portrayed in the Eat well guide. Methods: Food and drink adverts were recorded between 17:00 and 20:00 on channel 4 for seven consecutive days in December 2016. Portion sizes of products from 70 adverts were estimated using carbs and cals. Then organised into food groups represented by the Eatwell Guide plus HFSS and alco hol. One-sample Wilcoxon test was used to compare food groups from individual adverts with those presented in the Eatwell Guide. An 'EatAsAdvertised' model was created from the proportion of food groups from all adverts. Results: Three from five food groups from individual adverts were significantly different from the recommended Eatwell Guide proportions. Carbohydrates and fruit & vegetables were 22% lower (p = 0.0005, p = 0.003, respectively), Protein was 7% higher (p = 0.0005), oils and spreads were 0.85% lower (NS) and Dairy was 7% lower (NS) than in the Eatwell Guide. HFSS foods and alcohol represented 39% and 7%, respectively, however, comparisons are impossible as they are not accounted for in the Eatwell Guide. Discussion: HFSS featured the most in EatAsAdvertised. Which, concurs with previous data. Fast food companies (n = 25, 36%), contribut ed substantially to this figure suggest ing that regulation of HFSS food advertising is insufficient to prevent exposure to children. This may contribute to the £19.2 billion cost of diseases associated with obesity. Conclusion: The proportions of Starchy Carbohydrates, Pro tein, Fruit and Vegetables, HFSS and alcohol present in TV adverts did not correspond with the dietary guidelines repre sented in the Eatwell Guide. Suggesting that children are being exposed to messages via television that run contrary to public health guidance.
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Ball Y, Tammam J, 'An analysis of the food composition of television advertising and its comparison with the Eatwell Guide'
Journal of Human Nutrition and Dietetics 30 (Suppl. 1) (2017)
ISSN: 0952-3871 eISSN: 1365-277XAbstractPublished hereBackground: Advertising is a powerful medium for food and drink promotion, which can influence public perceptions of 'normal' food choices( 1 2 Food and drink advertising may run contrary to current healthy eating guidance. Greater under standing of this phenomenon may create opportunities to sup port health promotion. This study aimed to analyse the content of foods represented in television advertising, in order to compare with the national dietary guidelines. Methods: Peak-time (7- 9 pm) terrestrial television broadcast ing (ITV) was recorded for seven consecutive days during November 2015. One researcher estimated portion sizes of advertised meals in 53 adverts using a photographic food por tion guide. Proportions (by food group) were compared to dietary guidelines. Food group proportions within individual advertised meals were compared to corresponding Eatwell pro portions and analysed using Wilcoxon Signed Rank test (on SPSS software). Estimated proportions of all food groups were represented as an 'EatAsAdvertised' model. Results: Almost all advertised food groups were significantly different to guidance: fruit and vegetables (F&V) were 35% smaller (P = 0.008), dairy was 5% lower (P = 0.039), and car bohydrates were 22% lower (P = 0.216) whereas protein was 5% higher ( P = 0.005). Oils were not advertised. High fat, sugar, and salt (HFSS) foods represented 35% of advertised. Discussion: The highest proportions of food advertised were from the alcohol and HFSS group, yet these now appear exter nal (and unquantified) to the current Eatwell guide. This agrees with previous research( 3 l , which also identified HFSS foods as the most commonly advertised (41 %), compared to protein (3%), F&V (4%), dairy (10%) and carbohydrate foods (20%).Thi s phenomenon may promote unhealthy food beha viours in conflict with the Eatwell Guide. Lack of quantifiable comparison guidance in the Eatwell guide model regarding alcohol and HFSS is a limitation of the tool, as is the seasonal nature of the advertising surveillance. Future research may include adverts recorded over a longer time frame and at dif ferent times of year, as well as over multiple channels. Conclusion: The emphasis on high energy-density food and drink in UK television advertising, and underrepresentation of F&V, does not compare favourably to the Eatwell Guide.
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Hagger C, Stein J, Tammam J, 'An analysis of the food group composition and adequacy of adolescent diets in an underprivileged area of the UK'
Journal of Human Nutrition and Dietetics 29 (Suppl. 1) (2016)
ISSN: 0952-3871 eISSN: 1365-277XAbstractPublished hereBackground: In areas of deprivation, where health inequalities exist, deficiencies in adolescent diets are amplified1 with long‐term health consequences. This study aimed to analyse relative percentage of food group consumption of adolescents’ diet in an underprivileged area.
Method: A secondary analysis of one hundred and seventeen seven‐day food diaries of 13–16 years olds from a state school in a deprived borough of Greater London was carried out as part of a larger study investigating the behavioural effects of supplementary nutrition2. Portion sizes according to manufacturers weights were used where available otherwise estimates were taken. All diaries were analysed including those completed with
Results: The average adolescent diet consisted of 29% fatty and sugary foods, 30% starchy foods, 18% meat and other proteins, 14% fruit and vegetables and 9% dairy foods. Adolescents consumed a mean average of 1.27 portions per day of fruit and vegetables. 68% of the sample had inadequate dairy intakes, but having breakfast cereal positively correlated to dairy consumption (r = 0.42 p
Discussion: The adolescent diet was of a poorer composition than Eatwell Plate guidelines. The typical diet showed limited variety with a reliance on nutrient poor and energy dense foods, which could have long‐term health consequences. 98% of these adolescents did not meet the NDNS mean average intake of 2.9 portions of fruit and vegetables3. However, the NDNS sample is derived from a more affluent and relatively small sample size and it may not be representative of deprived areas. 35% of adolescent's soft drink intake alone contributed to more than 10% of their daily energy intake, therefore exceeding the recently proposed guidelines for free sugars4. These alarming proportions may explain high levels of dental caries in the area and suggests that proposed 5% free sugar targets4 might be unrealistic for this population.
Conclusion: Food group analysis of adolescent diet in a deprived area suggests that there are significant variances between the percentages of food groups eaten in comparison to recommended National guidelines; fruit and vegetable intake at 1.27 portions per day versus 5‐a‐day target and 21% of the daily energy intake derived from snacks and soft drinks versus a free sugar target of 5% are particularly stark examples. Identifying these at risk populations and targeting public health initiatives towards correcting this poor food group dietary composition will be paramount in averting future health implications.
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Lambert E, Tammam J, 'An investigation of the cost of omega 3 supplementation to meet EPA and DHA recommendations'
Journal of Human Nutrition and Dietetics 29 (Suppl. 1) (2016)
ISSN: 0952-3871 eISSN: 1365-277XAbstractPublished hereBackground: Eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) supplementation is thought to be beneficial in the treatment of hypertriglyceridemia and rheumatoid arthritis (1–2). However supplement price can be variable. The primary aim of this study was to investigate the cost of using omega‐3 fatty acid supplements readily available on the UK market to meet EPA and DHA recommended intakes. The secondary aim of the study was to investigate whether there is a significant difference in the EPA and DHA content of premium and high street store own brand supplements.
Methods: Twelve products from a UK high street chemist online store were selected. Four products were categorised as ‘own brand’ supplements and eight as ‘premium brand’ supplements. Cost (£/mg EPA+DHA) for each product was determined and used to calculate the cost of meeting EPA and DHA intake recommendations. Seven recommendations were investigated: North Atlantic Treaty Organisation (NATO), 1989; European Academy of Nutritional Sciences (EANS), 1998; European Food Safety Authority (EFSA), 2010; International Society for the Study of Fatty Acids and Lipids (ISSFAL), 2004; National Heart Foundation of Australia (NHFA), 2008, American Heart Association (AHA), 2003 and Arthritis Research UK (ARUK), 2012. An independent samples t‐test was performed assess differences in the costs of meeting recommended intakes between product groups. An independent t‐test was performed to assess differences in total EPA and DHA content between product groups.
Results: No significant difference was found in EPA and DHA content between the own brand products and the premium brand products (own brand = 292.5 mg (±158.0); premium brand = 375.5 mg (±175.5); p = 0.445). A significant difference was found in the cost of meeting the recommended intakes between own brand and premium brand supplements (Table 1; (p = 0.018).
Discussion: The results of this study may be useful in evaluating cost effectiveness of omega‐3 supplementation in several medical conditions. The results indicate that the significant difference in cost of high street own brand and premium brand supplements is unlikely to be due to differences in EPA and DHA content. This is supported by the results of another study (3). Thus consumers may not need to purchase more expensive products in order to meet EPA and DHA recommended intakes. However these results may have limitations due to use of a single vendor and reliance on the manufacturers’ stated EPA and DHA content.
Conclusions: The results of this study indicate that there is a significant difference in the cost of meeting EPA and DHA recommendations using high street own brand and premium brand supplements, but there is no significant difference in the EPA and DHA content of supplements in these groups.
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Lee J, Mellor D, Tammam J, 'Dietetics students’ views and experiences regarding the under representation of males within the dietetics profession: a cross sectional observational study'
Journal of Human Nutrition and Dietetics 29 (Suppl. 1) (2016) pp.54-55
ISSN: 0952-3871 eISSN: 1365-277XAbstractPublished hereBackground: Males represent less than 4% of registered dietitians within the UK (British Dietetic Association, 2014). To date little research has been conducted to investigate the views, influences, and experiences of student dietitians regarding this under representation in the UK. The aim of this study was to compare the views and experiences of student dietitians regarding the current gender representation within the profession.
Methods: All UK universities offering an under‐ and post‐graduate pre‐registration dietetics programme were invited to forward an online questionnaire to their dietetics students. The questionnaire, which was not pre‐piloted, included a combination of multiple choice, multiple response and Likert scale questions. Descriptive statistics were used to interpret questions. Where an appropriate response sample size (n > 5) allowed, Fisher's Exact test was used to determine significant differences between male and female responses. Ethical approval was obtained from the University of Hertfordshire's Health and Human Sciences Ethics Committee.
Results: From 14 universities, 11 confirmed forwarding the questionnaire to students. The study recruited 213 students, 21 of which were male. Significantly more males compared with females believed that increasing the number of males within dietetics would enhance the profession (95% vs. 72% respectively, p = 0.018). The majority of females (57% vs. 19% males) first discovered dietetics whilst in secondary school or sixth form; males more often (81% vs. 43% females) discovered the profession at a later stage. Of the 213 respondents, 25% (33% males vs. 24% females) agreed that there were discriminatory factors associated with males entering the profession, yet 4.7% of respondents (all female) reported there were discriminatory factors associated with females entering the profession. The majority of both males and females (76.2% vs. 63% respectively) agree that the profession should actively try to increase the number of males within dietetics.
Discussion: The majority of male and female respondents agreed that increasing the number of males within dietetics would enhance the profession. These findings concur with data from Canada (Lordly, 2012), which identified that the majority of the respondents also believed this to be the case when asked a similar question. However, the British Dietetic Association does not yet appear to have a strategy to promote the profession to the male population as part of diversity or widening participation agenda (British Dietetic Association, 2015). The reasons behind males discovering dietetics at a later stage in their life is unclear and warrants further investigation. The data suggest that recruitment strategies for males might benefit from targeting secondary school and sixth form students. Discrimination towards minorities within a profession still occurs (Shih, 2013) – a phenomenon discovered in the present study, albeit regarding entering the profession. It would be prudent to further define what the perceived discriminatory factors within dietetics are.
Conclusion: The findings suggest that an increase in the number of male dietitians could enhance diversity and the profession in general. It appears that discriminatory factors might exist, however the present study has not identified if these factors impact those entering or already within the profession.
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Chaudry S, McClinchy J, Tammam J, 'Perceptions and influences surrounding breastfeeding practices within a Pakistani community in the UK: a qualitative analysis'
Journal of Human Nutrition and Dietetics 29 (S1) (2016) pp.24-25
ISSN: 0952-3871 eISSN: 1365-277XAbstractPublished hereBackground: Many cultures encourage breastfeeding, yet formula milk is often given by choice in the UK. The Pakistani culture, however, exhibits high rates of breastfeeding as normal practice (1). The influence of the UK culture of formula feeding on a Pakistani mother's decisions to breastfeed was investigated. The aim of this qualitative study was to compare the views and experiences of breastfeeding from British Born Pakistani mothers (BBPMs) with Pakistani born mothers (PBMs; immigrated within last 10 years) in order to ascertain differences in influencing factors to breastfed.
Method: An interview was carried out on ten participants who were of Pakistani ethnicity and belonged to Ahmadiyya Muslim community of which the lead researcher is a member. The study was advertised by a brief announcement and held in the mosque before weekend events. Ethical approval was granted from University of Hertfordshire Ethics Committee. Participants were selected for interview on a first come first serve basis. The first five BBPMs and five PBMs participants, who agreed to take part were selected. They were given full information about the study, provided consent, and were interviewed in a private room. The interviewer used a semi‐structured questionnaire, the questions of which were informed by the breastfeeding literature. Each interview was audio recorded lasting 10–15 min. The interviews were transcribed manually and coded using thematic analysis, generating common themes. Theme saturation was reached after eight interviews.
Results: The participants ranged in age from 23 to 36 years. All the PBM were housewives, whereas all the BBPM had an occupation: teacher, pharmacist, nurse and a doctor. All the PBM breastfed for 12–24 months, whereas the BBPM breastfed for 1–4 months, with two BBPMs still breastfeeding.
Discussion: The general trend showed that PBM tend to breastfeed longer than BBPM, despite the research limitations (small study, single Islamic sect, limited range of occupations). Religion had equally the greatest influence on both groups. This concurs with previous research (3) and was not surprising as all participants were Muslim and the Quran gives direct guidance about breastfeeding. Culture was a theme that influenced decisions to breastfeed especially for PBM, as the Pakistani culture encourages involvement and support from relatives for breastfeeding‐ a factor known to increase breastfeeding (1). Education/occupation influenced BBPM decisions to breastfeed, also in line with previous research (2). A similar study (1) showed lower breastfeeding rates in Pakistani mothers in UK compared to mothers in Pakistan, however, there is limited research exploring the impact of acculturation on Pakistani mothers’ breastfeeding choices.
Conclusion: The three emergent themes could provide healthcare professionals with a greater understanding of different influencing factors between PBMs and BBPMs in order to encourage breastfeeding.
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Tammam J, Steinsaltz D, Bester D, Semb-Andenaes T, Stein F, 'A randomised double-blind placebo-controlled trial investigating the behavioural effects of vitamin, mineral and n-3 fatty acid supplementation in typically developing adolescent schoolchildren'
British Journal of Nutrition 115 (2) (2016) pp.361-373
ISSN: 0007-1145AbstractPublished hereNutrient deficiencies have been implicated in anti-social behaviour in schoolchildren; hence, correcting them may improve sociability. We therefore tested the effects of vitamin, mineral and n-3 supplementation on behaviour in a 12-week double-blind randomised placebo-controlled trial in typically developing UK adolescents aged 13–16 years (n 196). Changes in erythrocyte n-3 and 6 fatty acids and some mineral and vitamin levels were measured and compared with behavioural changes, using Conners’ teacher ratings and school disciplinary records. At baseline, the children’s PUFA (n-3 and n-6), vitamin and mineral levels were low, but they improved significantly in the group treated with n-3, vitamins and minerals (P=0·0005). On the Conners disruptive behaviour scale, the group given the active supplements improved, whereas the placebo group worsened (F=5·555, d=0·35; P=0·02). The general level of disciplinary infringements was low, thus making it difficult to obtain improvements. However, throughout the school term school disciplinary infringements increased significantly (by 25 %; Bayes factor=115) in both the treated and untreated groups. However, when the subjects were split into high and low baseline infringements, the low subset increased their offences, whereas the high-misbehaviour subset appeared to improve after treatment. But it was not possible to determine whether this was merely a statistical artifact. Thus, when assessed using the validated and standardised Conners teacher tests (but less clearly when using school discipline records in a school where misbehaviour was infrequent), supplementary nutrition might have a protective effect against worsening behaviour.
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Lewis K., Madden A, Tammam J, Tzilivakis J Vafeiadou K.,, 'Final evidence report as part of preparatory work for the setting of Dietary Reference Values for magnesium, copper, and phosphorus'
EFSA Journal 12 (10) (2015)
AbstractPublished hereThe present document has been produced and adopted by the bodies identified above as author(s). This task has been carried out exclusively by the author(s) in the context of a contract between the European Food Safety Authority and the author(s), awarded following a tender procedure. The present document is published complying with the transparency principle to which the Authority is subject. It may not be considered as an output adopted by the Authority. The European Food Safety Authority reserves its rights, view and position as regards the issues addressed and the conclusions reached in the present document, without prejudice to the rights of the authors.
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Harrar V, Tammam J, Perez-Bellido A, Pitt A, Stein J, Spence, 'Multisensory Integration and Attention in Developmental Dyslexia'
Current Biology 24 (5) (2014) pp.531-535
ISSN: 0960-9822AbstractPublished hereDevelopmental dyslexia affects 5%–10% of the population [1], resulting in poor spelling and reading skills. While there are well-documented differences in the way dyslexics process low-level visual [2, 3] and auditory [4, 5] stimuli, it is mostly unknown whether there are similar differences in audiovisual multisensory processes. Here, we investigated audiovisual integration using the redundant target effect (RTE) paradigm. Some conditions demonstrating audiovisual integration appear to depend upon magnocellular pathways [6], and dyslexia has been associated with deficits in this pathway [7]; so, we postulated that developmental dyslexics (“dyslexics” hereafter) would show differences in audiovisual integration compared with controls. Reaction times (RTs) to multisensory stimuli were compared with predictions from Miller’s race model [8, 9]. Dyslexics showed difficulty shifting their attention between modalities; but such “sluggish attention shifting” (SAS) [10] appeared only when dyslexics shifted their attention from the visual to the auditory modality. These results suggest that dyslexics distribute their crossmodal attention resources differently from controls, causing different patterns in multisensory responses compared to controls. From this, we propose that dyslexia training programs should take into account the asymmetric shifts of crossmodal attention.
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Prisons and Health: Availability of junk food should be reduced
Tammam J, Gillam L, Gesch B, Stein J, 'Prisons and Health: Availability of junk food should be reduced'
British Medical Journal 345 (2012)
ISSN: 1759-2151Published here -
Tammam J, Gardner L, Hickson M, 'Validity, reliability and acceptability of the Imperial Nutritional Screening System (INSYST): A tool that does not require the body mass index'
Journal of Human Nutrition and Dietetics 22 (6) (2009) pp.536-544
ISSN: 0952-3871 eISSN: 1365-277XAbstractPublished hereBackground: Nutritional screening tools are central to identifying malnourished patients, but their efficacy is often reduced as a result of difficulties in obtaining height for body mass index (BMI) calculations. The present study aimed to evaluate the validity, reliability and acceptability of the Imperial Nutritional Screening System (INSYST); a tool that does not require the BMI.
Methods: Patients were screened by the researcher within 72 h of admission using INSYST I & II, Malnutrition Universal Screening Tool (MUST) and Mini Nutritional Assessment (MNA), including taking height and weight. Routine INSYST data, completed by nursing staff, were subsequently collected. At risk and malnourished patients were combined for statistical analysis. Inter‐tool and inter‐rater agreement (kappa, κ) was evaluated. Sensitivity and specificity were calculated. Nurses were timed using INSYST. Acceptability, including ease and speed of use, was evaluated.
Results: Kappa (agreement) scores (all P
Conclusions: INSYST has shown promising levels of concurrent validity (versus MUST and MNA), inter‐rater reliability and acceptability, suggesting that BMI (and therefore height) is unnecessary for identifying malnourished patients.
Conference papers
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Poulter M, Coe S, Graham C-AM, Stein J, Tammam J, 'Nutritional assessment of the diets of prisoners in Young Offender Institutions'
83 (OCE2) (2024) pp.E240-
ISSN: 0029-6651 eISSN: 1475-2719AbstractPublished hereAdequate nutrition is necessary for overall health and development(1). Prisoners in general lack autonomy over their diet, in addition to being a population with a high risk of poor health outcomes(2, 3). It is important therefore that prisons are offered menus which meet dietary reference values (DRVs), as set by the UK government, aiming for equity with the general population, and that prisoners choose food options that are beneficial for their health. The aim of this study was to conduct a nutritional analysis of prisoners’ food diaries to determine whether dietary recommendations were being met.
Seven-day food diaries were collected from prisoners eating the normal food supplied by three young offender institutions in 2009. Food eaten was analysed using DietPlan6 version 6.0 (Forestfield Software Ltd). Individual nutrient data were tested for normality and compared against the UK DRVs and NDNS data from 2008/9 using either the one-sample T-test, or one-sample Wilcoxon Signed Rank Test. Data in the results is presented as (Mean ± SD).
There were n=466 diaries analysed, from male participants aged between 16 to 24 years. Twenty- eight nutrients were compared with their respective DRVs by age categories: 16-18y (n=156), 19-24y (n=310), and 16-24y (n=466).
For ages 16-24y, chloride (5556 ± 1692mg), folate (302 ± 112ug), iodine (195 ± 81ug), monounsaturated fat (35 ± 10g), potassium (3667 ± 1161mg), sodium (3899 ± 1392mg), sugar (136 ± 73g), riboflavin (2 ± 1mg), vitamin B12 (6 ± 4ug), vitamin C (92 ± 63mg), and zinc (11 ± 3mg) exceeded DRV requirements (P
For 16-18, and 19-24 respectively, calcium (1286 ± 928mg; 1337 ± 489mg), copper (1 ± 0.6mg; 2 ± 0.6mg), iron (14 ± 5mg; 15 ± 6mg), niacin (19 ± 7mg; 21 ± 7mg), phosphorus (1545 ± 381mg; 1620 ± 493mg), protein (96 ± 24g; 100 ± 29g), thiamine (2 ± 0.6mg; 2 ± 0.7mg), and vitamin B6 (2.3 ± 0.7ug; 3 ± 0.9ug) exceeded their DRV (P
This study represents the largest assessment of dietary intake of prisoners and demonstrates that the prison catering, for the most part, met the DRVs. However, sugar, fat, and energy intake exceeded their DRV target, posing clear risks to health by possibly contributing to later obesity, hypertension, Type 2 diabetes and heart disease.
Professional information
Memberships of professional bodies
- Registered Nutritionist with Association for Nutrition
- Registered Dietitian with Health and Care Professions Council
- Member Nutrition Society
- Member British Dietetics Association
- Fellow of the Higher Education Academy
- Fellow of the Institute of Food Brain and Behaviour
- Alumnus of the European Nutrition Leadership Platform Advanced Programme.
Conferences
I have presented research at national and international conferences.
Further details
Other publicity
- All Party Parliamentary Group invited speaker
- Radio interview and press conference contributions.