Vitamin B12 and folate levels in progression of Alzheimer's disease - a short report.

Background: The status of vitamin B12 and folate has been implicated in the development and progression of Alzheimer's disease.Methods: The study explored this issue through a retrospective case-control study design, with follow up of the case group for 18 months. The case group (n = 136) comprised patients 65 years or older diagnosed with Alzheimer's disease and having a Mini-mental State Examination score (MMSE) of ≤ 27. The control group comprised healthy adults 65 years or older (n = 338) with a MMSE score of >27.Results: Vitamin B12 and folate levels were not found to differ between case and control groups. B12 and folate status at baseline was not predictive of disease progression in the case group.Discussion: This lack of association differs from other studies which have shown a protective effect of vitamin B12 and folate on cognitive decline.KEY POINTSThe findings of this study do not confirm evidence suggesting an effect of vitamin B12 and folate levels on development and progression of Alzheimer's disease.Folate and B12 levels were similar in the Alzheimer's group to those of healthy controls.Folate and B12 levels at initial assessment were not predictive of disease progression.

Attitudes and behaviour towards convenience food and food waste in the United Kingdom.

Households in the UK discard much food. A reduction in such waste to mitigate environmental impact is part of UK government policy. This study investigated whether household food waste is linked to a lifestyle reliant on convenience food in younger consumers. A survey of 928 UK residents aged 18-40 years and responsible for the household food shopping (male n = 278; female n = 650) completed an online questionnaire designed to measure attitudes to convenience food and to quantify household food waste. Cluster analysis of 24 food-related lifestyle factors identified 5 consumer groups. General linear modelling techniques were used to test relationships between the purchase frequency of convenience food and household food waste. From the cluster analysis, five distinct convenience profiles emerged comprising: 'epicures' (n = 135), 'traditional consumers' (n = 255), 'casual consumers' (n = 246), 'food detached consumers' (n = 151) and 'kitchen evaders' (n = 141). Casual consumers and kitchen evaders were the most reliant on convenience food and notably were the most wasteful. The demographic profile of kitchen evaders matched the population groups currently targeted by UK food waste policy. Casual consumers represent a new and distinct group characterised by "buy a lot and waste a lot" behaviour. Household size, packaging format, price-awareness and marketing all appear to influence levels of food waste. However, it seems that subtle behavioural and sociocultural factors also have impact. Further research is needed to elucidate the factors that mediate the positive association between the purchase of convenience food and reported food waste in order to inform food waste policy and initiatives.

The influence of academic examinations on energy and nutrient intake in male university students.

BACKGROUND: Taking examinations is central to student experience at University and may cause psychological stress. Although stress is recognised to impact on food intake, the effects of undertaking examinations on students' dietary intake have not been well characterised. The purpose of this study was to assess how students' energy and nutrient intake may alter during examination periods. METHODS: The study design was a within-subject comparison of students' energy and nutrient intake during an examination period contrasted with that outside an examination period (baseline). A total of 20 male students from the University of Sheffield completed an automated photographic 4-d dietary record alongside four 24-h recalls in each time period. Daily energy and nutrient intake was estimated for each student by time period and change in energy and nutrient intake calculated. Intakes at baseline were compared to UK dietary recommendations. Cluster analysis categorised students according to their change in energy intake between baseline and the examination period. Non-parametric statistical tests identified differences by cluster. RESULTS: Baseline intakes did not meet recommendations for energy, non-milk extrinsic sugars, non-starch polysaccharide and sodium. Three defined clusters of students were identified: Cluster D who decreased daily energy intake by 12.06 MJ (n = 5), Cluster S who had similar energy intakes (n = 13) and Cluster I who substantially increased energy intake by 6.37 MJ (n = 2) between baseline and examination period. There were statistically significant differences (all p < 0.05) in change in intake of protein, carbohydrate, calcium and sodium between clusters. Cluster D recorded greater energy, carbohydrate and protein intakes than Cluster I at baseline. CONCLUSIONS: The majority of students were dietary resilient. Students who demonstrated hypophagia in the examination period had a high energy and nutrient intake at baseline, conversely those who showed hyperphagia had a low energy and nutrient intake. These patterns require confirmation in studies including women, but if confirmed, there is need to address some students' poor food choice especially during examinations.

Tumour suppressor gene methylation and cervical cell folate concentration are determinants of high-risk human papillomavirus persistence: a nested case control study.

BACKGROUND: Persistent infection with one or more high-risk human papillomavirus [HR-HPV] types increases the risk of intraepithelial neoplasia and cervical cancer. A nested case-control study was conducted to investigate the importance of cervical cell folate concentration and tumour suppressor gene methylation as risk factors for HR-HPV persistence. METHODS: Cervical cell samples from 955 women with HR-HPV infection and normal, borderline or mild dyskaryosis were retrieved from the archive of a population-based screening trial. Women were classified as cases or controls, reflecting the presence or absence [respectively] of any HR-HPV infection at a follow-up clinic at least 6 months from baseline. Cervical cell folate concentration and promoter methylation of five tumour suppressor genes were measured in independent samples from cases and controls. RESULTS: A higher cervical cell folate concentration [P = 0.015] was an independent predictor of infection at follow-up, together with infection with HPV-16 or infection with multiple HR-HPV types. Methylation of the tumour suppressor gene DAPK was associated with a 2.64-fold [95% CI, 1.35-5.17] increased likelihood of HPV infection whilst CDH1 methylation was associated with a 0.53-fold [95% CI, 0.331-0.844] likelihood of HR-HPV infection at follow-up. When considering women with normal or abnormal cytology, the predictive effect of higher cervical cell folate was only seen in women with mild cytology [P = 0.021]; similarly the effect of DAPK methylation was seen in women with mild or borderline cytology [P < 0.05]. CONCLUSIONS: Higher cervical cell folate concentration and promoter methylation of the tumour suppressor gene, DAPK, in women with cervical cell dyskaryosis, are associated with increased risk of HR-HPV persistence.

Temporality in British young women's magazines: food, cooking and weight loss.

OBJECTIVE: The present study examines seasonal and temporal patterns in food-related content of two UK magazines for young women focusing on food types, cooking and weight loss. DESIGN: Content analysis of magazines from three time blocks between 1999 and 2011. SETTING: Desk-based study. SUBJECTS: Ninety-seven magazines yielding 590 advertisements and 148 articles. RESULTS: Cluster analysis of type of food advertising produced three clusters of magazines, which reflected recognised food behaviours of young women: vegetarianism, convenience eating and weight control. The first cluster of magazines was associated with Christmas and Millennium time periods, with advertising of alcohol, coffee, cheese, vegetarian meat substitutes and weight-loss pills. Recipes were prominent in article content and tended to be for cakes/desserts, luxury meals and party food. The second cluster was associated with summer months and 2010 issues. There was little advertising for conventional foods in cluster 2, but strong representation of diet plans and foods for weight loss. Weight-loss messages in articles focused on short-term aesthetic goals, emphasising speedy weight loss without giving up nice foods or exercising. Cluster 3 magazines were associated with post-New Year and 2005 periods. Food advertising was for everyday foods and convenience products, with fewer weight-loss products than other clusters; conversely, article content had a greater prevalence of weight-loss messages. CONCLUSIONS: The cyclical nature of magazine content - indulgence and excess encouraged at Christmas, restraint recommended post-New Year and severe dieting advocated in the summer months - endorses yo-yo dieting behaviour and may not be conducive to public health.

Dietary advice for muscularity, leanness and weight control in Men's Health magazine: a content analysis.

BACKGROUND: The dietary content of advice in men's lifestyle magazines has not been closely scrutinised. METHODS: We carried out an analysis of such content in all 2009 issues (n = 11) of Men's Health (MH) focusing on muscularity, leanness and weight control. RESULTS: Promotion of a mesomorphic body image underpinned advice to affect muscle building and control weight. Diet advice was underpinned by a strong pseudo-scientific discourse, with citation of expert sources widely used to legitimise the information. Frequently multiple dietary components were advocated within one article e.g. fat, omega-3 fatty acids, thiamine, zinc and high-glycaemic index foods. Furthermore advice would cover numerous nutritional effects, e.g. strengthening bones, reducing stress and boosting testosterone, with little contextualisation. The emphasis on attainment of a mesomorphic body image permitted promotion of slimming diets.Advice to increase calorie and protein intake to augment muscle mass was frequent (183 and 262 references, respectively). Such an anabolic diet was advised in various ways, including consumption of traditional protein foods (217 references) and sports foods (107 references), thereby replicating muscle magazines' support for nutritional supplements. Although advice to increase consumption of red meat was common (52 references), fish and non-flesh sources of protein (eggs, nuts & pulses, and soy products) together exceeded red meat in number of recommendations (206 references). Advice widely asserted micronutrients and phytochemicals from plant food (161 references) as being important in muscle building. This emphasis diverges from stereotypical gender-based food consumption patterns.Dietary advice for control of body weight largely replicated that of muscularity, with strong endorsement to consume fruits and vegetables (59 references), diets rich in nuts and pulses and fish (66 references), as well as specific micronutrients and phytochemicals (62 references). Notably there was emphasis on fat-burning, good fats and consumption of single foods, with relatively little mention of dietary restriction. CONCLUSIONS: Despite the widespread use of scientific information to endorse dietary advice, the content, format and scientific basis of dietary content of MH leaves much to be desired. The dietary advice as provided may not be conducive to public health.

Improving the nutritional quality of charitable meals for homeless and vulnerable adults. A case study of food provision by a food aid organisation in the UK.

The prevalence of homelessness in the UK is rising, and demand for food aid through charitable meal services has increased. Charitable services make a substantial contribution to the food and nutrient intake of vulnerable people, and thus offer a platform for dietary improvement. This study examined food provision by a large charitable organisation in a major UK city. It had several objectives: Firstly to quantify nutritional composition of breakfast and lunch meals, secondly to understand factors that influence the composition of menus and meals, and thirdly to determine whether, within the context of these influences, improvements to the menu would be possible and whether these would be acceptable to clients. Mixed methods of ethnography, semi-structured interviews, quantitative nutrient analysis, recipe adaptation and taste tests were employed. The research team worked as volunteers in the organisation for a 3-week period and interviews were held with the kitchen staff. Food choice was recorded for 189 clients at breakfast and 251 clients at lunch over a 5-day period and nutrient content of these meals was estimated. Meals were weighted towards fat and sugar energy. Energy, potassium, calcium, vitamin C, vitamin A, zinc and magnesium content of meals were below Dietary Reference Value (DRV) targets for at least 20% of breakfast and lunch meals. Such inadequacies may be addressed by the addition of simple foods to the breakfast menu and adaptation of lunchtime recipes. Twelve lunchtime dishes were proposed and eight of these were seemingly acceptable to clients in taste testing. Barriers to provision of healthier meals include budget, food donations and acceptability of meals.

Water intake and post-exercise cognitive performance: an observational study of long-distance walkers and runners.

PURPOSE: The impact of diet on endurance performance and cognitive function has been extensively researched in controlled settings, but there are limited observational data in field situations. This study examines relationships between nutrient intake and cognitive function following endurance exercise amongst a group of 33 recreational runners and walkers. METHODS: All participants (mean age of 43.2 years) took part in a long-distance walking event and completed diet diaries to estimate nutrient intake across three-time periods (previous day, breakfast and during the event). Anthropometric measurements were recorded. Cognitive tests, covering word recall, ruler drop and trail making tests (TMT) A and B were conducted pre- and post-exercise. Participants rated their exercise level on a validated scale. Nutrient intake data were summarised using principal components analysis to identify a nutrient intake pattern loaded towards water intake across all time periods. Regression analysis was used to ascertain relationships between water intake component scores and post-exercise cognitive function, controlling for anthropometric measures and exercise metrics (distance, duration and pace). RESULTS: Participants rated their exercise as 'hard-heavy' (score 14.4, ±3.2). Scores on the water intake factor were associated with significantly faster TMT A (p = 0.001) and TMT B (p = 0.005) completion times, and a tendency for improved short-term memory (p = 0.090). Water intake scores were not associated with simple reaction time (assessed via the ruler drop test). CONCLUSION: These data are congruent with experimental research demonstrating a benefit of hydration on cognitive function. Further field research to confirm this relationship, supported with precise measures of body weight, is needed.

Effects of pomegranate juice supplementation on pulse wave velocity and blood pressure in healthy young and middle-aged men and women.

Pomegranate juice may improve cardiovascular risk because of its content of antioxidant polyphenols. We conducted a randomized placebo-controlled parallel study to examine the effect of pomegranate juice on pulse wave velocity (PWV), blood pressure (BP) and plasma antioxidant status (ferric reducing power; FRAP) in 51 healthy adults (30-50 years). Participants consumed 330 ml/day of pomegranate juice or control drink for four weeks. Measurements were made at baseline and at four weeks. There was no effect of the intervention on PWV (P = 0.694) and plasma FRAP (P = 0.700). However, there was a significant fall in systolic blood pressure (-3.14 mmHg, P < 0.001), diastolic blood pressure (-2.33 mmHg P < 0.001) and mean arterial pressure (-2.60 mmHg, P < 0.001). Change in weight was similar in the two groups over the intervention period (P = 0.379). The fall in BP was not paralleled by changes in concentration of serum angiotensin converting enzyme. We conclude that pomegranate juice supplementation has benefits for BP in the short term, but has no effect on PWV. The mechanism for the effect is uncertain.

Studies of salivary pepsin in patients with gastro-oesophageal reflux disease.

BACKGROUND: Gastro-oesophageal reflux disease (GERD) is difficult to diagnose without invasive testing. Peptest (RD Biomed, Hull, UK) is a recently marketed diagnostic tool which aims to quantify salivary pepsin as a marker of reflux, providing a rapid alternative to invasive procedures. AIM: To evaluate optimal timing for sampling, and to evaluate the accuracy of Peptest against an independent measure. METHODS: Thirty diagnosed GERD patients (12 female, mean age 49 [range 20-72]) and 20 asymptomatic subjects (14 female, mean age 56 [range 21-56]) were subject to diurnal saliva sampling, with additional samples for 60 minutes following self-reported reflux symptoms and triggering of a proximal reflux alarm. Saliva samples were split and were analysed by both Peptest and ELISA with operators for each blinded to sample identity. RESULTS: Salivary pepsin was detectable in most patients and most volunteers. Peptest scores were significantly lower for patients than controls (P < 0.005). ELISA scores showed no difference between patients and controls. There was no effect of diurnal sampling time (P = 0.75) or time after symptoms (P = 0.76) on Peptest readout. There was no correlation between Peptest and Pepsin ELISA (P = 0.55); Bland-Altman analysis suggested no agreement between the tests (P = 0.414). Receiver-operator curve suggests that neither Peptest (P = 0.3328) nor pepsin (P = 0.4476) is useful for predicting GERD. CONCLUSION: Salivary pepsin is not a reliable tool for the diagnosis of GERD.

Calcium supplementation and bone mineral accretion in adolescent girls: an 18-mo randomized controlled trial with 2-y follow-up.

BACKGROUND: A recent meta-analysis raised doubt as to whether calcium supplementation in children benefits spine and hip bone mineral density (BMD). OBJECTIVE: We used state-of-the-art measures of bone (fan-beam dual-energy X-ray absorptiometry and 4 bone turnover markers) to determine whether girls with low habitual calcium intake benefited from supplementation with a soluble form of calcium (calcium citrate malate dissolved in a fruit drink). DESIGN: The trial was an 18-mo randomized trial of calcium supplementation (792 mg/d) with follow-up 2 y after supplement withdrawal. Subjects were 96 girls (mean age: 12 y) with low calcium intakes (mean: 636 mg/d). The main outcome measure was change in total-body, lumbar spine, and total hip bone mineral content (BMC) during supplementation and 2 y after supplement withdrawal. Changes in BMD and bone turnover markers were secondary outcome measures. RESULTS: The mean additional calcium intake in the supplemented group was 555 mg/d. Compared with the control group, the supplemented group showed significantly (P < 0.05) greater gains in BMC (except at the total hip site) over the 18-mo study. BMD change was significantly (P < 0.05) greater for all skeletal sites, and concentrations of bone resorption markers and parathyroid hormone were significantly (P < 0.01) lower in the supplemented group than in the control group after 18 mo. After 42 mo, gains in BMC and BMD and differences in bone resorption were no longer evident. CONCLUSIONS: Calcium supplementation enhances bone mineral accrual in teenage girls, but the effect is short-lived. The likely mechanism for the effect of the calcium is suppression of bone turnover, which is reversed upon supplement withdrawal.

Differing perceptions among ethnic minority and Caucasian medical students which may affect their relative academic performance.

INTRODUCTION: Ethnic minority (EM) medical students in the United Kingdom underperform academically compared to their Caucasian counterparts, but the reasons are unclear and further understanding is required. AIM: To explore self-reported factors that might influence academic underperformance of EM medical students. METHOD: An online semi-structured questionnaire was used to identify associations between several dimensions that had been identified in previous research and obtain free-text comments. RESULTS: Three-hundred and fifty-one medical students (73.3% Caucasian and 26.5% EM) from the Universities of Sheffield, Keele and London responded. EM medical students were less satisfied with their academic performance and less likely to feel they belonged to the medical school community due to their cultural background, including socio-economic factors. CONCLUSION: Differences exist between EM and Caucasian medical students in their learning experiences in medical school. There is a need to increase awareness, for both medical students and teaching staff, of the impact of cultural diversity on academic performance at medical school.

Long-chain polyunsaturated fatty acid supplementation had no effect on body weight but reduced energy intake in overweight and obese women.

Longer-chain polyunsaturated fatty acids may have greater appetite-suppressing effects than shorter-chain, monosaturated, and saturated fatty acids. Because fish oils are predominantly composed of n-3 long-chain polyunsaturated fatty acid and may assist in the treatment of obesity comorbidities, their effect on body weight and body mass index is of interest. We hypothesized that daily supplementation with docosahexaenoic acid (DHA)-rich oil would reduce energy intake and body weight in overweight and obese women compared with supplementation with oleic acid (OA) rich oil. A double-blinded, randomized, parallel intervention was conducted. Body mass index (in kilograms per meter squared), body weight (in kilograms), body fat (in percent), and lean tissue (in kilograms) were measured at baseline and 12 weeks after intervention with DHA or OA. Diet diaries were also completed at these time points for estimation of energy and macronutrient intake. Subjects reported significantly lower energy (P = .020), carbohydrate (g) (P = .037), and fat (g) (P = .045) intake after DHA compared with OA. Body mass or composition was not affected by treatment, although a fall in body weight in the DHA group approached statistical significance (P = .089). Daily ingestion of DHA over a 12-week period may reduce energy intake in overweight and obese females, but longer-term and adequately powered studies using subjects of both sexes are needed. Other factors that should be considered include the following: the choice of control, the body mass index category of subjects, and ways of improving the compliancy and accuracy of dietary assessment.

Clinical rating scales and instruments: how do they compare in assessing abnormal, involuntary movements?

OBJECTIVE: Recent studies have shown that quantitative instrumental measurements are more sensitive than clinical rating scales to subclinical dyskinesia and parkinsonism. We therefore hypothesized that an instrumental assessment would be more sensitive to the presence of dyskinetic and parkinsonian movements than the Abnormal Involuntary Movement Scale (AIMS), the Dyskinesia Identification Scale, Condensed User Version (DISCUS), and the Simpson-Angus Scale (SAS). We also hypothesized that the DISCUS, by virtue of its more detailed protocol, would be more sensitive than the AIMS. METHOD: Using blinded raters, we compared the clinical rating scales with instrumental measurements in 100 patients referred to a movement disorders clinic. We collected demographic data, risk factors for tardive dyskinesia, current medication use, Axis I and III disorders, and an estimate of cognitive functioning using the Mini-Mental Status Examination. RESULTS: There was no significant difference between the AIM and the DISCUS in the identification of dyskinesia. However, an instrumental assessment revealed a significantly greater prevalence of dyskinesia. The Mini-Mental Status Examination was the most prominent predictor of both instrumental and clinical measurements of parkinsonian and dyskinetic movements. CONCLUSIONS: It appears that even trained raters, utilizing standard rating scales, may underestimate the prevalence of some motor abnormalities. Instrumental ratings may be helpful to both the clinician and investigator, particularly when abnormal movements are not clinically obvious. The relationship between cognitive impairment and motor abnormalities remains an important area for further research.