Publications by authors named "Nita G Forouhi"

Introduction: Observational studies have shown that more educated people are at lower risk of developing type 2 diabetes (T2D). However, robust study designs are needed to investigate the likelihood that such a relationship is causal. This study used genetic instruments for education to estimate the effect of education on T2D using the Mendelian randomisation (MR) approach.

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  • A study analyzed the link between different levels of food processing and the risk of developing type 2 diabetes, using data from the EPIC cohort involving nearly 312,000 participants over about 11 years.
  • The results showed that higher intake of ultra-processed foods (UPF) was significantly associated with an increased risk of type 2 diabetes, while unprocessed/minimally processed foods and processed foods were linked to a lower risk.
  • Sub-group analysis revealed specific types of UPF, like certain breads and plant-based alternatives, that, surprisingly, were associated with a reduced risk of developing type 2 diabetes.
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There is limited evidence on the effects of different dietary sources of fats on detailed blood fatty acids (FAs). We aimed to evaluate the effects of coconut oil, olive oil and butter on circulating FA concentrations, and examine the associations between changes in plasma FAs and changes in metabolic markers. We conducted secondary analyses in the COB (coconut oil, olive oil and butter) Trial that evaluated 96 healthy adults in a 4-week parallel randomized clinical trial of three dietary interventions: 50 g/d of extra-virgin coconut oil (n = 30), extra-virgin olive oil (n = 33), or unsalted butter (n = 33).

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Background: Physical activity (PA) and diet quality have each been shown to be inversely associated with mortality but their combined impact on longevity has been less explored, particularly when considering their changes over time. This study aimed to examine the separate and combined associations of PA, diet quality and their changes over time with mortality outcomes.

Methods: A prospective cohort study was performed on 9349 adults aged 40 to 79 years from the population-based European Prospective Investigation into Cancer in Norfolk Study, with repeated measurements of PA and diet (from 1993 till 2004) and subsequent follow-up till 2022 (median follow-up 18.

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Objective: This study builds on prior findings that link increased availability of takeaway food outlets in home, workplace, and commuting environments to greater takeaway consumption and adiposity. Using longitudinal data, we examine associations of takeaway availability at baseline with changes in consumption and adiposity between baseline and follow-up.

Methods: We analyzed data from the Fenland Study, with baseline data from 2005 to 2015 and follow-up from 2015 to 2020.

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Background: Meat consumption could increase the risk of type 2 diabetes. However, evidence is largely based on studies of European and North American populations, with heterogeneous analysis strategies and a greater focus on red meat than on poultry. We aimed to investigate the associations of unprocessed red meat, processed meat, and poultry consumption with type 2 diabetes using data from worldwide cohorts and harmonised analytical approaches.

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Purpose: We quantified levels of ultra-processed food (UPF) consumption and investigated consumption patterns in a representative sample of UK adolescents.

Methods: We used data from 4-day food diaries from adolescents in the UK National Diet and Nutrition Survey (NDNS) (2008/09-2018/19). UPF were identified using the NOVA classification.

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  • The study aimed to compare different dietary scores derived from the EAT-Lancet reference diet and examine their links to health outcomes like mortality and stroke incidence, as well as their environmental impacts related to greenhouse gas emissions.
  • A systematic review identified seven different diet scores and analyzed their effectiveness in categorizing participants according to the EAT-Lancet recommendations across three diverse cohorts: Danish, Swedish, and Mexican populations.
  • The findings indicated that two scores (Stubbendorff and Colizzi) effectively grouped participants based on adherence to the EAT-Lancet diet, with higher scores correlating to a lower risk of all-cause mortality and stroke events.
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Objective: The study objective was to assess participant weight change for the English National Health Service (NHS) Digital Weight Management Programme, the first such digital intervention to achieve population coverage.

Methods: A service evaluation was used to assess intervention effectiveness for adults with obesity and a diagnosis of hypertension and/or diabetes, between April 2021 and March 2022, using prospectively collected, national service-level data in England.

Results: Of the 63,937 referrals made from general practices, within the time period, 31,861 (50%) chose to take up the 12-week Programme.

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  • Epidemiological studies suggest that the link between dietary protein intake and cardiovascular disease (CVD) might depend on whether the protein is plant- or animal-based, but previous research has been inconclusive.
  • The analysis involved over 16,000 CVD cases and aimed to assess how different protein sources impact the risk of CVD, ischemic heart disease (IHD), and stroke using various statistical methods.
  • Findings revealed that plant-derived protein intake was associated with a lower incidence of total stroke in never smokers, especially when replacing red and processed meat proteins, but overall, neither protein source showed a significant association with CVD, IHD, or stroke risk.
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Researchers wishing to interact with the food industry can be subject to conflicts of interest and reputational risks, but new guidance from Cullerton and colleagues should help researchers navigate this tricky territory, make informed decisions, and minimise adverse outcomes.

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Introduction: Dietary intake of (poly)phenols has been linked to reduced adiposity and body weight (BW) in several epidemiological studies. However, epidemiological evidence on (poly)phenol biomarkers, particularly plasma concentrations, is scarce. We aimed to investigate the associations between plasma (poly)phenols and prospective BW change in participants from the European Prospective Investigation into Cancer and Nutrition (EPIC) cohort.

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  • The study examined the relationship between omega-3 PUFAs and stroke risk across 29 global cohorts, focusing on total, ischemic, and hemorrhagic strokes.
  • Results showed that higher levels of eicosapentaenoic acid reduced the incidence of total and ischemic strokes by 17% and 18%, respectively, while docosahexaenoic acid also lowered these risks by 12% and 14%.
  • The findings indicate that although higher omega-3 PUFA levels are linked to reduced total and ischemic stroke risks, there is no effect on hemorrhagic strokes.
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  • The study aimed to find metabolites linked to regular dairy intake and their potential impact on type 2 diabetes (T2D) risk.* -
  • Researchers analyzed data from two large studies, utilizing metabolomics to create scores representing dairy consumption and evaluate their link to T2D incidence.* -
  • Results indicated that higher consumption of milk and butter, as well as overall dairy, was associated with a lower risk of developing T2D, suggesting a possible objective way to assess dairy's health effects.*
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Background: It is unknown whether dietary intake of polyunsaturated fatty acids (PUFA) modifies the cardiovascular disease (CVD) risk associated with a family history of CVD. We assessed interactions between biomarkers of low PUFA intake and a family history in relation to long-term CVD risk in a large consortium.

Methods: Blood and tissue PUFA data from 40 885 CVD-free adults were assessed.

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Purpose: Previously reported associations of protein-rich foods with stroke subtypes have prompted interest in the assessment of individual amino acids. We examined the associations of dietary amino acids with risks of ischaemic and haemorrhagic stroke in the EPIC study.

Methods: We analysed data from 356,142 participants from seven European countries.

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Background: The relationship between omega-3 fatty acids and atrial fibrillation (AF) remains controversial.

Objectives: This study aimed to determine the prospective associations of blood or adipose tissue levels of eicosapentaenoic acid (EPA), docosapentaenoic acid (DPA), and docosahexaenoic acid (DHA) with incident AF.

Methods: We used participant-level data from a global consortium of 17 prospective cohort studies, each with baseline data on blood or adipose tissue omega-3 fatty acid levels and AF outcomes.

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Aims/hypothesis: Islet autoimmunity may progress to adult-onset diabetes. We investigated whether circulating odd-chain fatty acids (OCFA) 15:0 and 17:0, which are inversely associated with type 2 diabetes, interact with autoantibodies against GAD65 (GAD65Ab) on the incidence of adult-onset diabetes.

Methods: We used the European EPIC-InterAct case-cohort study including 11,124 incident adult-onset diabetes cases and a subcohort of 14,866 randomly selected individuals.

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Background: Self-reported adherence to the Mediterranean diet has been modestly inversely associated with incidence of type 2 diabetes (T2D) in cohort studies. There is uncertainty about the validity and magnitude of this association due to subjective reporting of diet. The association has not been evaluated using an objectively measured biomarker of the Mediterranean diet.

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Nutrition therapy has been emphasised for decades for people with type 2 diabetes, and the vital importance of diet and nutrition is now also recognised for type 2 diabetes prevention. However, the complexity of diet and mixed messages on what is unhealthy, healthy or optimal have led to confusion among people with diabetes and their physicians as well as the general public. What should people eat for the prevention, management and remission of type 2 diabetes? Recently, progress has been made in research evidence that has advanced our understanding in several areas of past uncertainty.

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Introduction: Cardiorespiratory fitness (CRF) is rarely measured in population studies. Most studies of CRF do not examine differences by population subgroups or seasonal trends. We examined how estimated CRF levels vary by anthropometric, sociodemographic, and behavioral characteristics in a population-based cohort of UK adults (the Fenland Study).

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Objective: The aim of this study was to evaluate the associations among the intake of total polyphenols, polyphenol classes, and polyphenol subclasses and body weight change over 5 years.

Methods: A total of 349,165 men and women aged 25 to 70 years were recruited in the Physical Activity, Nutrition, Alcohol, Cessation of Smoking, Eating Out of Home and Obesity (PANACEA) project of the European Prospective Investigation into Cancer and Nutrition (EPIC) cohort from nine European countries. Body weight was measured at baseline and at follow-up after a median time of 5 years.

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An abnormal Zn status has been suggested to play a role in the pathogenesis of type 2 diabetes. However, epidemiological studies of the relationship between plasma Zn concentrations and diabetes are sparse and inconclusive. We aimed to investigate the association between plasma Zn concentrations and glycaemic markers (fasting glucose, 2-h glucose and homeostatic model assessment of insulin resistance) in rural and urban Cameroon.

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