The role of polyphenols on sugar release from carbohydrate rich foods, and the consequent impact on metabolic risk factors associated with type 2 diabetes

In the United Kingdom from 1993 to 2011, the proportion of people who were overweight and obese increased from 58 to 65 % in men and from 49 to 58 % in women. There was also an increase in related comorbidities including type 2 diabetes, which is predicted to be the 7th leading cause of death by 2030. The modification of food is becoming an attractive option in obesity management and disease prevention with much interest recently focused on the role of plant extracts and secondary plant compounds such as polyphenols as potential functional food additives for improving glycaemic control. The aim of this PhD was to assess the effect of a variety of polyphenol rich sources including green, black and white teas, and also green tea extract, grape seed extract, resveratrol, and baobab fruit extract, on starch digestion and on markers of glycaemia. Throughout an in vitro digestion procedure, green tea and all of the polyphenol rich extracts were found to reduce starch digestion from white bread, and this effect was dose specific. These same doses of green tea extract and baobab fruit extract added into white bread were shown to have no effect on reducing the glycaemic response in healthy subjects, and therefore there may be inconstancies between in vitro and in vivo methods. However, although having no effect on glycaemia, baobab addition to white bread was shown to reduce the postprandial insulin response. Conversely, baobab fruit extract consumed as a solution at higher doses in combination with white bread was found to reduce the postprandial glycaemic response. Therefore baobab fruit extract may show potential as a functional food additive for improving health, and more specifically for alleviating markers of abnormal glucose metabolism

Potential benefits of a ketogenic diet to improve response and recovery from physical exertion in people with Myalgic encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS): A feasibility study

Background. Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) affects approximately 250,000 people in the UK. The condition varies in severity causing long-term physical and cognitive fatigue which is not alleviated by rest. Whilst the pathology is not understood, recent evidence suggests metabolic abnormalities may be associated with the manifestation of symptoms, particularly involving the metabolism of glucose and energy production. The use of ketone bodies as an alternative energy substrate may be beneficial to people with ME/CFS, in order to by-pass the glycolytic pathway, enhance energy production and reduce fatiguing outcomes. Study Design and Methods. Using a pragmatic collective case study with repeated measures methodology we investigated the feasibility of following a ketogenic diet and potential effects of the high fat, low carbohydrate diet on response to physical activity in people with ME/CFS (n=3) and healthy controls (n=3) using a submaximal exercise stress test both with and without dietary intervention. Exercise tolerance (mins), rate of oxygen consumption (VO2) to workload (75W), respiratory exchange ratio (RER), rate of perceived effort (RPE) and lactate response were measured throughout and descriptive statistics performed.   Results. We found that the ketogenic diet was followed, with compliance higher in the pwME/CFS. Variations in response following the ketogenic diet was observed across individuals in minutes performed, VO2, HR, RER, and RPE post diet but the KD only limited exercise capacity in the control individuals. Individuals responded differently to the KD but group trends have been reported as means and standard deviation. The KD resulted in a decrease in RER at submax in the controls with a mean change of 0.07 from baseline (0.86 ± 0.1) to post intervention (0.79 ± 0.1) compared to a mean change of 0.02 in the ME/CFS from baseline (1.03 ± 0.1) to post intervention (1.01 ± 0.1). A decrease in VO2 (L/min) at submax showed a mean change of 0.06 (L/min) in the pwME/CFS at baseline (1.34 ± 0.1) to post intervention (1.27 ± 0.2) compared to a mean change of 0.07 (L/min) in the controls at baseline (1.40 ± 0.3) to post intervention (1.33 ± 0.2). HR (bpm) at submax decreased in all individuals, with a mean change of 4 (bpm), with pwME/CFS at baseline (139 ± 8.2) to post intervention (135 ± 14) and control individuals at baseline (107 ± 7.8) to intervention (103 ± 3.2). RPE at submax decreased in the pwME/CFS from baseline (6 ± 1.0) to post intervention (5 ± 2.1) whereas the controls increased from baseline (2 ± 1.0) to post intervention (3 ± 1.5).  Conclusion. Our observations suggest individualised but metabolic flexibility in healthy individuals is achievable via dietary manipulation showing the ability to switch from glucose to fats under controlled conditions. The different response in substrate utilisation in individuals with ME/CFS suggests that potential metabolic abnormalities may be present in ME/CFS.  Further investigation is now warranted in order to assess whether the KD is beneficial for people with ME/CFS

Availability and quality assessment of online nutrition information materials for pelvic cancer patients in the UK

Written information can be an essential source of support in the promotion of lifestyle changes after a cancer diagnosis. This study aimed to identify and assess the quality of available online Patient Information Materials (PIMs) in relation to diet and nutrition for pelvic cancer patients. The online sources of the National Health Service, cancer centres and charitable organisations throughout the UK were searched. Content was assessed using an evidence-based checklist, and readability with two validated formulas. Consumer feedback was sought through Patient and Public Involvement (PPI) groups. Forty PIMs were identified; four were designed specifically for pelvic cancers (bladder, bowel, prostate) and 36 were generic (relevant for all cancers). Most PIMs had a good content score, with PIMs from charities scoring higher overall than PIMs from cancer centres [32 (4) Vs 23 (11), P<0.001]. Seventy-three percent of PIMs had a readability score within acceptable levels (6th-8th grade; reading ability of 11-14 year-olds). PPI contributors found most PIMs useful and comprehensive but lacking specific information needed to meet individual needs. There is limited availability of online PIMs for cancer survivors and even fewer tailored to pelvic cancers. Most materials have comprehensive content and acceptable readability. Some PIMs may require improvemen

A cross-sectional feasibility study of nutrient intake patterns in people with Parkinson’s compared to government nutrition guidelines

Background: Diet could have implications for disease progression and management in people with Parkinson’s disease (PwP). However, the knowledge of diet intake patterns in PwP is limited. Objectives: We set out to assess the feasibility of collecting diet data in PwP to determine food and nutrient intake, in order to compare to national nutrition guidelines and thus understand the habits in this population. Methods: In this cross-sectional feasibility study, PwP were approached through local support groups throughout the Thames Valley and were asked to complete a Food Frequency Questionnaire. Eligibility criteria included a self-reported neurologist confirmed diagnosis of Parkinson’s disease. Completeness of questionnaires was reported and 80% was considered appropriate for each measure including demographic information. Results: Response rate was 61% and missing data rate for the 121 returned questionnaires was 74%; however, of the 90 used for analysis there was 100% completion of the questionnaires. Compared to the UK government guidelines, protein was significantly higher for both males and females and fluid intake was lower for both genders (p < 0.001). There were several other differences in nutrient intake compared to guidelines. Conclusion: We observed high levels of engagement from PwP and found that assessing food and nutrient patterns in PwP was feasible. Importantly, the diet was generally healthy overall, yet there were specific nutrients that may affect medication metabolism in PwP that were found to be high. Therefore further research into this emerging and important area is warranted

Effectiveness of Vitamin D Supplementation in the Management of Multiple Sclerosis: A Systematic Review

Methods: A literature search was performed in November 2018 (CRD42018103615). Eligibility criteria: randomised control trials in English from 2012 to 2018; a clinical diagnosis of MS; interventions containing vitamin D supplementation (vitamin D3 or calcitriol) in disease activity compared to a control/placebo; improvement in: serum 25(OH)D, relapse rates, disability status by Expanded Disability Status Scale (EDSS) scores, cytokine profile, quality of life, mobility, T2 lesion load and new T2 or T1 Gd enhancing lesions, safety and adverse effects. Risk of bias was evaluated. Results: Ten studies were selected. The study size ranged from 40 to 94 people. All studies evaluated the use of vitamin D supplementation (ranging from 10 to 98,000 IU), comparing to a placebo or low dose vitamin D. The duration of the intervention ranged from 12 to 96 weeks. One trial found a significant effect on EDSS score, three demonstrated a significant change in serum cytokines level, one found benefits to current enhancing lesions and three studies evaluating the safety and tolerability of vitamin D reported no serious adverse events. Disease measures improved to a greater extent overall in those with lower baseline serum 25(OH)D levels. Conclusions: As shown in 3 out of 10 studies, improvement in disease measures may be more apparent in those with lower baseline vitamin D levels

A retrospective outcome study of 42 patients with Chronic Fatigue Syndrome, 30 of whom had Irritable Bowel Syndrome. Half were treated with oral approaches, and half were treated with Faecal Microbiome Transplantation

The gut microbiome comprises the community of microorganisms in the intestinal tract. Research suggests that an altered microbiome may play a role in a wide range of disorders including myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS). Methods. 42 participants with ME/CFS with Irritable Bowel Syndrome (IBS) were allocated into one of two groups, 21 were treated with standard oral approaches, which centred around various nutritional remedies, probiotics, prebiotics, dietary advice and lifestyle advice. The second group who had mostly failed using oral approaches, were treated with Faecal Microbiome Transplantation (FMT). Each patient received 10 Implants, each from a different screened donor, and the Implants were processed under anaerobic conditions. The transplant is delivered via a paediatric rectal catheter, which is inserted through the anus to reach the lower part of the sigmoid colon. The results were assessed on a percentage basis before and after treatment, 0% being no improvement, 100% being maximum improvement. An exact non-parametric Mann-Whitney (one-tailed) test was used to compare medians from those on FMT compared with those receiving oral approaches only. On clinical experience over many years, the only way to judge improvement in Chronic Fatigue Syndrome as there is no test for Chronic Fatigue Syndrome, is my clinical assessment. Results. The median for the FMT group was found to be significantly higher compared to the oral treatment group (Mann-Whitney U = 111.5, p = .003). Therefore, the FMT group improved to a greater extent (z = −2.761). Conclusion. This study shows that FMT is a safe and a promising treatment for CFS associated with IBS. Adequately powered randomised controlled trials should be carried out to assess the effectiveness of FMT in patients with CFS and IBS

The impact of lockdown during the COVID-19 outbreak on dietary habits in various population groups: A scoping review

Background: Since the beginning of the COVID-19 pandemic, access to fresh food has been restricted, and people are spending more time inside and have limited their physical activity. However, more time at home may have resulted in some positive habits including an increase in cooking. The aim of this review was to assess dietary changes during the first lockdown. Themes and patterns were considered and associations with other lifestyle factors were assessed. Methods: Between June and July 2020, the PubMed, Google Scholar, and Science Direct databases were searched, and results were screened for eligibility based on title, abstract, and full text. The inclusion criteria of this search included: papers published (or in pre-print) in the year 2020; studies that investigated the impact of COVID-19 lockdown on diet; papers published in English. Exclusion criteria were as follows: papers examining dietary changes in those following a structured diet based on diagnosed conditions or dietetic advice; literature, systematic, or narrative studies reviewing previous research. Researchers agreed on the study characteristics for extraction from final papers. Results: Four thousand three hundred and twenty-two studies were originally considered with 23 final full-text papers included. Four themes were identified: dietary patterns, dietary habits (favorable), dietary habits (unfavorable), and other (includes physical activity levels, weight gain). A total of 10 studies reported an increase in the number of snacks consumed, while six studies found that participants increased their meal number and frequency during quarantine. Eleven studies reported favorable changes in dietary habits with an increase in fresh produce and home cooking and reductions in comfort food and alcohol consumption. However, nine studies found a reduction in fresh produce, with a further six reporting an increase in comfort foods including sweets, fried food, snack foods, and processed foods. Two studies reported an increase in alcohol consumption. In eight studies participants reported weight gain with seven studies reporting a reduction in physical exercise. Conclusion: The effect of COVID-19 lockdown both negatively and positively impacted dietary practices throughout Europe and globally, and negative diet habits were associated with other poor lifestyle outcomes including weight gain, mental health issues, and limited physical activity. Both in the short term and if sustained in the long term, these changes may have significant impacts on the health of the population

Millet intake and risk ractors of Type 2 Diabetes: A systematic review

Daily consumption of millet-based foods is associated with a reduced risk of type-2 diabetes. The aim of the present study was to systematically review the literature describing intervention studies that have investigated the effects of consuming different types and forms of millet on the risk factors for type-2 diabetes. A literature search was conducted, using five databases, from May 2016 to January 2017, which identified 57 articles. Search terms included ‘millet’ AND healthy, pre-diabetic or type-2 diabetes AND fasting blood glucose or glycaemic or glycemic response or insulin response or glucose tolerance or insulin sensitivity. Nineteen studies met the inclusion criteria. Although glycemic and insulin responses differ depending on the millet type and cooking method used, overall, millet has a beneficial effect on fasting and postprandial blood glucose and the plasma-insulin response in healthy individuals and those with type-2 diabetes. It can be concluded that millets do have the potential to play a protective role in the management of type-2 diabetes

Diet and nutrition information and support needs in pelvic radiotherapy: A systematic, mixed-methods review

Introduction: This study aimed to review diet and nutrition information and support needs of cancer patients who receive pelvic radiotherapy to inform the development of interventions to improve this area of care. Methods: The systematic review followed the PRISMA guidelines. Six electronic databases were searched for peer-reviewed studies of any design that assessed diet and nutrition needs after a pelvic cancer diagnosis. Narrative synthesis was used to integrate findings. Results: Thirty studies (12 quantitative, 15 qualitative, 3 mixed-methods) were included. Four themes, “content of dietary information”; “sources of information”. “sustaining dietary change”; and “views on the role of diet post-treatment”, summarised evidence about provision of nutritional guidance following diagnosis, but also contrasting views about the role of diet post diagnosis. Qualitative studies contributed considerably more to the synthesis, compared to quantitative studies. Included studies were of moderate to good quality; selection bias in quantitative studies and poor evidence of credibility and dependability in qualitative studies were highlighted. Conclusion: There is some evidence of lack of nutrition support in pelvic cancer survivors, but methodological limitations of included studies may have had an impact on the findings. Future, prospective studies that focus on diet and nutrition needs post-diagnosis are warranted to improve care