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Ward NA, Reid-McCann R, Brennan L, Cardwell CR, de Groot C, Maggi S, McCaffrey N, McGuinness B, McKinley MC, Noale M, O'Neill RF, Prinelli F, Sergi G, Trevisan C, Volkert D, Woodside JV, McEvoy CT. Effects of PROtein enriched MEDiterranean Diet and EXercise on nutritional status and cognition in adults at risk of undernutrition and cognitive decline: the PROMED-EX Randomised Controlled Trial. BMJ Open 2023; 13:e070689. [PMID: 37880167 PMCID: PMC10603411 DOI: 10.1136/bmjopen-2022-070689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Accepted: 08/31/2023] [Indexed: 10/27/2023] Open
Abstract
INTRODUCTION Undernutrition leading to unplanned weight loss is common in older age and has been linked to increased dementia risk in later life. Weight loss can precede dementia by a decade or more, providing a unique opportunity for early intervention to correct undernutrition and potentially prevent or delay cognitive impairment. The combined effects of diet and exercise on undernutrition have not yet been evaluated. The objective of this trial is to determine the effect of a protein-enriched Mediterranean diet, with and without exercise, on nutritional status and cognitive performance in older adults at risk of undernutrition and cognitive decline. METHODS One hundred and five participants aged 60 years and over at risk of undernutrition and with subjective cognitive decline will be recruited to participate in a 6-month, single-blind, parallel-group randomised controlled trial. Participants will be block randomised into one of three groups: group 1-PROMED-EX (diet+exercise), group 2-PROMED (diet only) and group 3-standard care (control). The primary outcome is nutritional status measured using the Mini Nutritional Assessment. Secondary outcomes include cognitive function, nutritional intake, body composition, physical function and quality of life. Mechanistic pathways for potential diet and exercise-induced change in nutritional status and cognition will be explored by measuring inflammatory, metabolic, nutritional and metabolomic biomarkers. ETHICS AND DISSEMINATION The study is approved by the UK Office for Research Ethics Committee (ref: 21/NW/0215). Written informed consent will be obtained from participants prior to recruitment. Research results will be disseminated to the public via meetings and media and the scientific community through conference presentations and publication in academic journals. TRIAL REGISTRATION NUMBER ClinicalTrials.gov Registry (NCT05166564).
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Affiliation(s)
- Nicola Ann Ward
- Centre for Public Health, Queen's University Belfast, Belfast, UK
| | | | - Lorraine Brennan
- School of Agriculture and Food Science, Institute of Food and Health and Conway Institute, University College Dublin, Dublin, Ireland
| | | | - Cpgm de Groot
- Division of Human Nutrition, Wageningen University, Wageningen, The Netherlands
| | - Stefania Maggi
- Neuroscience Institute, Aging Branch, National Research Council, Padua, Italy
| | - Noel McCaffrey
- ExWell Medical, Irish Wheelchair Association, Dublin, Ireland
| | | | | | - Marianna Noale
- Neuroscience Institute, Aging Branch, National Research Council, Padua, Italy
| | - Roisin F O'Neill
- Centre for Public Health, Queen's University Belfast, Belfast, UK
| | - Federica Prinelli
- Institute for Biomedical Technologies, Epidemiology Unit, National Research Council, Segrate, Italy
| | - Giuseppe Sergi
- Department of Medical Sciences, University of Ferrara, Ferrara, Italy
| | - Caterina Trevisan
- Department of Medical Sciences, University of Ferrara, Ferrara, Italy
| | - Dorothee Volkert
- Institute for Biomedicine of Aging, Friedrich-Alexander-Universitat Erlangen-Nurnberg, Nuremberg, Germany
| | - Jayne V Woodside
- Centre for Public Health, Queen's University Belfast, Belfast, UK
| | - Claire T McEvoy
- Centre for Public Health, Queen's University Belfast, Belfast, UK
- Global Brain Health Institute, Trinity College Dublin, Ireland & University of California, San Francisco, California, USA
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A peer support dietary change intervention for encouraging adoption and maintenance of the Mediterranean diet in a non-Mediterranean population (TEAM-MED): lessons learned and suggested improvements. J Nutr Sci 2023; 12:e13. [PMID: 36843970 PMCID: PMC9947623 DOI: 10.1017/jns.2023.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 12/29/2022] [Accepted: 12/30/2022] [Indexed: 01/31/2023] Open
Abstract
Peer support interventions for dietary change may offer cost-effective alternatives to interventions led by health professionals. This process evaluation of a trial to encourage the adoption and maintenance of a Mediterranean diet in a Northern European population at high CVD risk (TEAM-MED) aimed to investigate the feasibility of implementing a group-based peer support intervention for dietary change, positive elements of the intervention and aspects that could be improved. Data on training and support for the peer supporters; intervention fidelity and acceptability; acceptability of data collection processes for the trial and reasons for withdrawal from the trial were considered. Data were collected from observations, questionnaires and interviews, with both peer supporters and trial participants. Peer supporters were recruited and trained to result in successful implementation of the intervention; all intended sessions were run, with the majority of elements included. Peer supporters were complimentary of the training, and positive comments from participants centred around the peer supporters, the intervention materials and the supportive nature of the group sessions. Attendance at the group sessions, however, waned over the intervention, with suggested effects on intervention engagement, enthusiasm and group cohesion. Reduced attendance was reportedly a result of meeting (in)frequency and organisational concerns, but increased social activities and group-based activities may also increase engagement, group cohesion and attendance. The peer support intervention was successfully implemented and tested, but improvements can be suggested and may enhance the successful nature of these types of interventions. Some consideration of personal preferences may also improve outcomes.
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Tsofliou F, Vlachos D, Hughes C, Appleton KM. Barriers and Facilitators Associated with the Adoption of and Adherence to a Mediterranean Style Diet in Adults: A Systematic Review of Published Observational and Qualitative Studies. Nutrients 2022; 14:4314. [PMID: 36296998 PMCID: PMC9607475 DOI: 10.3390/nu14204314] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2022] [Revised: 10/09/2022] [Accepted: 10/12/2022] [Indexed: 11/16/2022] Open
Abstract
The Mediterranean diet (MedDiet) has been linked with physical and mental health benefits. Previous research, however, suggests that adoption and adherence to a Mediterranean diet might be difficult for people who live outside of the Mediterranean region. The aim of this systematic review was to investigate the factors that influence adoption and adherence to a Mediterranean style diet in adults aged 18 years old and over, as identified in published observational and qualitative studies. Following registration of our protocol on PROSPERO (ID: CRD42018116515), observational and qualitative studies of adults' perceptions and experiences relevant to following a Mediterranean style diet were identified using systematic searches of databases: MEDLINE, the Cochane Library, CINAHL, Web of Science and Scopus, over all years of records until February 2022. A narrative synthesis was then undertaken. Of 4559 retrieved articles, 18 studies fulfilled our inclusion criteria and were included. Factors influencing adoption and adherence to a MedDiet were identified and categorized as: financial, cognitive, socio-cultural, motivational, lifestyle, accessibility & availability, sensory & hedonic and demographic. Similar barriers and facilitators are often reported in relation to healthy eating or the consumption of specific healthy foods, with a few exceptions. These exceptions detailed concerns with specific components of the MedDiet; considerations due to culture and traditions, and concerns over a cooler climate. Suggestions for overcoming these barriers and facilitators specific to adoption and adherence to the Mediterranean diet are offered. These data will inform the development of future studies of robust methodology in eating behaviour change which offer pragmatic approaches for people to consume and maintain healthy diets.
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Affiliation(s)
- Fotini Tsofliou
- Department of Rehabilitation and Sport Sciences, Faculty of Health & Social Sciences, Bournemouth University, Bournemouth BH8 8GP, UK
- Centre for Midwifery, Maternal & Perinatal Health, Faculty of Health & Social Sciences, Bournemouth University, Bournemouth BH8 8GP, UK
| | - Dimitrios Vlachos
- Department of Rehabilitation and Sport Sciences, Faculty of Health & Social Sciences, Bournemouth University, Bournemouth BH8 8GP, UK
| | - Christina Hughes
- Department of Rehabilitation and Sport Sciences, Faculty of Health & Social Sciences, Bournemouth University, Bournemouth BH8 8GP, UK
| | - Katherine M. Appleton
- Department of Psychology, Faculty of Science and Technology, Talbot Campus, Bournemouth University, Fern Barrow, Bournemouth BH12 5BB, UK
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The feasibility of a peer support intervention to encourage adoption and maintenance of a Mediterranean diet in established community groups at increased CVD risk: the TEAM-MED EXTEND study: a pilot cluster randomised controlled trial. Br J Nutr 2022; 128:1445-1458. [PMID: 34753522 PMCID: PMC9556267 DOI: 10.1017/s0007114521004050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
This study aimed to evaluate the feasibility of a peer support intervention to encourage adoption and maintenance of a Mediterranean diet (MD) in established community groups where existing social support may assist the behaviour change process. Four established community groups with members at increased Cardiovascular Disease (CVD) risk and homogenous in gender were recruited and randomised to receive either a 12-month Peer Support (PS) intervention (PSG) (n 2) or a Minimal Support intervention (educational materials only) (MSG) (n 2). The feasibility of the intervention was assessed using recruitment and retention rates, assessing the variability of outcome measures (primary outcome: adoption of an MD at 6 months (using a Mediterranean Diet Score (MDS)) and process evaluation measures including qualitative interviews. Recruitment rates for community groups (n 4/8), participants (n 31/51) and peer supporters (n 6/14) were 50 %, 61 % and 43 %, respectively. The recruitment strategy faced several challenges with recruitment and retention of participants, leading to a smaller sample than intended. At 12 months, a 65 % and 76·5 % retention rate for PSG and MSG participants was observed, respectively. A > 2-point increase in MDS was observed in both the PSG and the MSG at 6 months, maintained at 12 months. An increase in MD adherence was evident in both groups during follow-up; however, the challenges faced in recruitment and retention suggest a definitive study of the peer support intervention using current methods is not feasible and refinement based on the current feasibility study should be incorporated. Lessons learned during the implementation of this intervention will help inform future interventions in this area.
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Woodside J, Young IS, McKinley MC. Culturally adapting the Mediterranean Diet pattern - a way of promoting more 'sustainable' dietary change? Br J Nutr 2022; 128:693-703. [PMID: 35734884 PMCID: PMC9346614 DOI: 10.1017/s0007114522001945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Average diet quality is low in the UK and is socioeconomically patterned, contributing to the risk of non-communicable disease and poor health. Achieving meaningful dietary change in the long term is challenging, with intervention required on a number of different levels which reflect the multiple determinants of dietary choice. Dietary patterns have been identified which contribute positively to health outcomes; one of these is the Mediterranean diet (MD) which has been demonstrated to be associated with reduced non-communicable disease risk. Most research exploring the health benefits of the MD has been conducted in Mediterranean regions but, increasingly, research is also being conducted in non-Mediterranean regions. The MD is a dietary pattern that could have positive impacts on both health and environmental outcomes, while being palatable, appetising and acceptable. In this review, we consider the studies that have explored transferability of the MD. To achieve long-term dietary change towards a MD, it is likely that the dietary pattern will have to be culturally adapted, yet preserving the core health-promoting elements and nutritional composition, while considering the food system transition required to support changes at population level. Population-specific barriers need to be identified and ways sought to overcome these barriers, for example, key food availability and cost. This should follow a formal cultural adaptation framework. Such an approach is likely to enhance the extent of adherence in the longer term, thus having an impact on population health.
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Affiliation(s)
- Jayne Woodside
- Centre for Public Health, Institute for Clinical Science A, Grosvenor Road, Belfast, Queen’s University Belfast, BelfastBT12 6BJ, UK
- Institute for Global Food Security, Queen’s University Belfast, Belfast, UK
- Corresponding author: Jayne Woodside, email
| | - Ian S. Young
- Centre for Public Health, Institute for Clinical Science A, Grosvenor Road, Belfast, Queen’s University Belfast, BelfastBT12 6BJ, UK
- Institute for Global Food Security, Queen’s University Belfast, Belfast, UK
| | - Michelle C. McKinley
- Centre for Public Health, Institute for Clinical Science A, Grosvenor Road, Belfast, Queen’s University Belfast, BelfastBT12 6BJ, UK
- Institute for Global Food Security, Queen’s University Belfast, Belfast, UK
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Balasubramanian S, Harper J, Sterba KR, Viswanathan R, Eldredge-Hindy H. Protocol for the Pilot Study of Group Video Yogic Breathing App in Breast Cancer Survivors. INTERNATIONAL JOURNAL OF AAYUSH AND TRADITIONAL MEDICINE 2022; 2:38-57. [PMID: 36790946 PMCID: PMC9924219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
INTRODUCTION Breast cancer remains a leading cause of cancer deaths; however, recent improvements in treatment have improved survivorship. As a result of this improvement, more individuals are living with the long-term side effects of cancer treatment. Therefore, methods that incorporate lifestyle and mind-body approaches are becoming increasingly used in the patient treatment pathway. METHODS In this study, PranaScience Institute will develop and test a group video mobile application for Yogic Breathing (YB). YB is shown to reduce symptomatic conditions associated with several conditions including breast cancer. For this initial feasibility study, PranaScience will collaborate with the Medical University of South Carolina to implement the study app-based program in breast cancer survivors. This research is aimed to understand if the YB could be delivered via an app, if participants are able to practice it satisfactorily, and if there is any symptom relief by the YB practice. In the control group, participants will be directed to the Attention Control (AC) feature of the app, which guides users to focus on a mindfulness activity not involving YB. Participants will be randomly assigned to the YB or AC study plan (N = 20 per group). Breast cancer survivors who have completed radiation therapy within last 2 months will be recruited for this study and provided access to the app for a 12-weeks program. The study app will record total practice times. Virtual visits by a study yoga instructor during group video sessions will measure participant compliance with proper technique. Feasibility will be examined by evaluating intervention delivery factors and resource needs. Acceptability of using the mobile study app to support symptom management will be evaluated using a satisfaction and system usability scale. Behavioral survey measures will help guide effect sizes and power calculations for the next larger-scale study. Biomarkers in the saliva (tumor suppressors, cytokines), and fingernails (cortisol, differential proteomics) will be measured at baseline and end of study at 12 weeks. DISCUSSION All findings from this pilot study will be synthesized to refine the mobile study app in preparation for large-scale evaluation in Phase II involving all-study site participants with cancer. ClinicalTrials.gov Identifier NCT05161260.
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Affiliation(s)
- Sundaravadivel Balasubramanian
- Department of Radiation Oncology, Hollings Cancer Center, USA,Department of Public Health Sciences, Medical University of South Carolina, Charleston, USA
| | - Jennifer Harper
- Department of Radiation Oncology, Hollings Cancer Center, USA
| | - Katherine R Sterba
- Department of Public Health Sciences, Medical University of South Carolina, Charleston, USA
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Fernández-Alvira JM, Fernández-Jiménez R, de Miguel M, Santos-Beneit G, Bodega P, Hill CA, Carral V, Rodríguez C, Carvajal I, Orrit X, de Cos-Gandoy A, Dal Re M, Robledo T, Fuster V. The challenge of sustainability: Long-term results from the Fifty-Fifty peer group-based intervention in cardiovascular risk factors. Am Heart J 2021; 240:81-88. [PMID: 34147462 DOI: 10.1016/j.ahj.2021.06.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Accepted: 06/13/2021] [Indexed: 01/17/2023]
Abstract
BACKGROUND The Fifty-Fifty trial demonstrated that a peer-group-based intervention was able to improve healthy behaviors in individuals with cardiovascular (CV) risk factors immediately post-intervention. OBJECTIVES To determine the long-term sustainability of a one-year peer-group-based intervention focused on CV health and behavior. METHODS A total of 543 adults aged 25 to 50 years with at least 1 CV risk factor were screened and recruited, received initial training through workshops, and were then randomized 1:1 to a peer-group-based intervention group (IG) or a self-management control group (CG) for 12 months. At a median of 52 months from baseline, 321 participants were re-assessed (~60% retention). The primary outcome was the mean change in a composite health score related to blood pressure, exercise, weight, alimentation, and tobacco use (Fuster-BEWAT score [FBS], range 0-15). Intervention effects were assessed using linear-mixed effects models. RESULTS The mean age of retained participants was 48.0 years (SD: 5.4), and 73% were female. Consistent with previous results, the change of overall FBS was significantly greater in the IG than in the CG at 12-month follow-up (between-group difference, 0.60 points; 95% CI, 0.08-1.12; P = .025). Assessment of long-term sustainability (52-month follow-up) showed that there were no between-group differences in the mean overall FBS (IG mean score, 8.52; 95% CI, 7.97-9.07 vs CG mean score, 8.51; 95% CI, 7.93-9.10; P = .972) or in the change of overall FBS from screening (IG mean change, 0.64; 95% CI, 0.00-1.28; CG mean change, 0.46; 95% CI, -0.20-1.12; P = .497). CONCLUSIONS A one-year peer-group-based intervention showed favorable results at immediate post-intervention but did not demonstrate significant differences between the IG and CG at 52 months. Combination of an initial training period (workshops) with the maintenance of peer-support groups or other re-intervention strategies may be required to achieve sustained effects on healthy behaviors. TRIAL REGISTRATION ClinicalTrials.gov identifier NCT02367963. Registered (https://clinicaltrials.gov/show/NCT02367963).
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Affiliation(s)
| | - Rodrigo Fernández-Jiménez
- Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain; Hospital Universitario Clínico San Carlos, Madrid, Spain.
| | - Mercedes de Miguel
- Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain; Foundation for Science, Health and Education (SHE), Barcelona, Spain
| | - Gloria Santos-Beneit
- Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain; Foundation for Science, Health and Education (SHE), Barcelona, Spain; The Zena and Michael A. Wiener Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York, NY
| | - Patricia Bodega
- Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain; Foundation for Science, Health and Education (SHE), Barcelona, Spain
| | - Christopher A Hill
- The Zena and Michael A. Wiener Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York, NY
| | - Vanesa Carral
- Foundation for Science, Health and Education (SHE), Barcelona, Spain
| | - Carla Rodríguez
- Foundation for Science, Health and Education (SHE), Barcelona, Spain
| | - Isabel Carvajal
- Foundation for Science, Health and Education (SHE), Barcelona, Spain
| | - Xavier Orrit
- Foundation for Science, Health and Education (SHE), Barcelona, Spain
| | - Amaya de Cos-Gandoy
- Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain; Foundation for Science, Health and Education (SHE), Barcelona, Spain
| | - Marian Dal Re
- Spanish Agency for Food Safety and Nutrition (AESAN), Madrid, Spain
| | - Teresa Robledo
- Spanish Agency for Food Safety and Nutrition (AESAN), Madrid, Spain
| | - Valentín Fuster
- Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain; Foundation for Science, Health and Education (SHE), Barcelona, Spain; The Zena and Michael A. Wiener Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York, NY.
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Macias S, Kirma J, Yilmaz A, Moore SE, McKinley MC, McKeown PP, Woodside JV, Graham SF, Green BD. Application of 1H-NMR Metabolomics for the Discovery of Blood Plasma Biomarkers of a Mediterranean Diet. Metabolites 2019; 9:metabo9100201. [PMID: 31569638 PMCID: PMC6836148 DOI: 10.3390/metabo9100201] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Revised: 09/22/2019] [Accepted: 09/23/2019] [Indexed: 12/19/2022] Open
Abstract
The Mediterranean diet (MD) is a dietary pattern well-known for its benefits in disease prevention. Monitoring adherence to the MD could be improved by discovery of novel dietary biomarkers. The MEDiterranean Diet in Northern Ireland (MEDDINI) intervention study monitored the adherence of participants to the MD for up to 12 months. This investigation aimed to profile plasma metabolites, correlating each against the MD score of participants (n = 58). Based on an established 14-point scale MD score, subjects were classified into two groups (“low” and “high”). 1H-Nuclear Magnetic Resonance (1H-NMR) metabolomic analysis found that citric acid was the most significant metabolite (p = 5.99 × 10−4*; q = 0.03), differing between ‘low’ and ‘high’. Furthermore, five additional metabolites significantly differed (p < 0.05; q < 0.35) between the two groups. Discriminatory metabolites included: citric acid, pyruvic acid, betaine, mannose, acetic acid and myo-inositol. Additionally, the top five most influential metabolites in multivariate models were also citric acid, pyruvic acid, betaine, mannose and myo-inositol. Metabolites significantly correlated with the consumption of certain food types. For example, citric acid positively correlated fruit, fruit juice and vegetable constituents of the diet, and negatively correlated with sweet foods alone or when combined with carbonated drinks. Citric acid was the best performing biomarker and this was enhanced by paired ratio with pyruvic acid. The present study demonstrates the utility of metabolomic profiling for effectively assessing adherence to MD and the discovery of novel dietary biomarkers.
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Affiliation(s)
- Shirin Macias
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Belfast BT9 5DL, UK.
| | - Joseph Kirma
- Beaumont Health, 3811 W. 13 Mile Road, Royal Oak, MI 48073, USA.
- Oakland University-William Beaumont School of Medicine, Rochester, MI 48309, USA.
| | - Ali Yilmaz
- Beaumont Health, 3811 W. 13 Mile Road, Royal Oak, MI 48073, USA.
- Oakland University-William Beaumont School of Medicine, Rochester, MI 48309, USA.
| | - Sarah E Moore
- Centre for Public Health, Queen's University Belfast, Belfast BT12 6BA, UK.
| | | | - Pascal P McKeown
- School of Medicine, Dentistry and Biomedical Sciences, Queen's University Belfast, Belfast BT9 7BL, UK
| | - Jayne V Woodside
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Belfast BT9 5DL, UK.
- Centre for Public Health, Queen's University Belfast, Belfast BT12 6BA, UK.
| | - Stewart F Graham
- Beaumont Health, 3811 W. 13 Mile Road, Royal Oak, MI 48073, USA.
- Oakland University-William Beaumont School of Medicine, Rochester, MI 48309, USA.
| | - Brian D Green
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Belfast BT9 5DL, UK.
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