American Journal of Clinical Nutrition

The rapidly evolving field of immunometabolism explores how changes in local immune environments may affect the key metabolic and cellular processes, including that of adipose tissue. Importantly, these changes may contribute to low-grade systemic inflammation. In turn, chronic low-grade inflammation affecting adipose tissue may exacerbate the outcome of metabolic diseases. Novel advances in our understanding of immune-metabolic processes may critically lead to interventions to reduce disease severity and progression...

The regulation of postprandial muscle protein synthesis (MPS) with or without physical activity has been an intensely studied area within nutrition and physiology. The leucine content of dietary protein, and the subsequent plasma leucinemia it elicits post-ingestion, are often considered the primary drivers of the postprandial MPS response. This concept, generally known as the leucine 'trigger' hypothesis, has also been adopted within more applied aspects of nutrition. Our view is that recent evidence is driving a more nuanced picture of the regulation of postprandial MPS by revealing a compelling dissociation between ingested leucine or plasma leucinemia and the magnitude of the postprandial MPS response...

BACKGROUND: Eating healthier is associated with a range of favorable health outcomes. Our previous model estimated the impact of dietary changes on life expectancy gains, but did not consider height, weight, or physical activity. OBJECTIVE: We estimate the increase in life expectancy resulting from the transition from typical national dietary patterns to longevity-optimizing dietary changes, more feasible dietary modifications, and optimized vegan dietary changes for China, France, Germany, Iran, Norway, the United Kingdom, and the United States...

BACKGROUND: Environmental enteric dysfunction (EED), a chronic inflammatory condition of the small intestine, is an important driver of childhood malnutrition globally. Quantifying intestinal morphology in EED allows for exploration of its association with functional and disease outcomes. OBJECTIVE: We sought to define morphometric characteristics of childhood EED and determine whether morphology features were associated with disease pathophysiology. METHODS: Morphometric measurements and histology were assessed on duodenal biopsy slides for this cross-sectional study from children with EED in Bangladesh, Pakistan, and Zambia (n=69), and those with no pathologic abnormality (NPA; n=8) or celiac disease (n=18) in North America...

BACKGROUND: It is unclear whether salivary iodine concentration (SIC) can assess iodine status in females from different water iodine regions. OBJECTIVE: Through a cross-sectional study, we explored the feasibility of SIC as a biomarker to assess iodine status in females and develop optimal cut-off values. METHODS: A total of 1991 females were analyzed in this cross-sectional study from the coastal iodine-deficient areas (CIDA), inland iodine-deficient areas (IIDA), iodine-adequate areas (IAA), iodine-excess areas (IEA), and iodine extra-high areas (IEHA)...

BACKGROUND: Response curves formed by analyte concentrations measured at sampled time points after consuming a mixed meal are increasingly being used to characterize responses to differing diets. Unfortunately, due to a variety of reasons, analyte concentrations for some of the time points may be missing. OBJECTIVE: To develop an algorithm to estimate the missing values at sampled time points in the analyte response curve to a mixed meal tolerance test (MMTT). DESIGN: We developed an algorithm to simulate the missing post-prandial concentration values for a MMTT...

BACKGROUND: Interplay between lifestyle (LRS) and genetic risk scores (GRS) on obesity and related chronic diseases are under-investigated and necessary for understanding obesity causes and developing prevention strategies. OBJECTIVES: To investigate independent and joint associations and interactions of LRS and GRS with obesity prevalence and risks of diabetes, cardiovascular disease (CVD), and obesity-related cancer. METHODS: In this cohort study of 444,957 UK Biobank participants (age: 56...

BACKGROUND: Dietary choices can affect human health through alterations in gut microbial metabolism, and gut microbial metabolites could serve as biomarkers for disease risk conferred by dietary intake. However, self-reported dietary intake may not reflect true intake. OBJECTIVE: We identified circulating metabolites, including gut microbiome-related metabolites, associated with adherence to a healthy diet in the ChooseWell 365 study. In this randomized clinical trial, the dietary choices of hospital employees were assessed over 24 months using not only 24-hour dietary recalls, but also electronic records of hospital cafeteria purchases...

BACKGROUND: Identifying diets beneficial for both human and planetary health has become increasingly important. However, to date, there is limited research on sustainable diets for children and adolescents, a vulnerable population group with specific nutritional needs. OBJECTIVE: We aimed: to identify 1) the main determinants and 2) age and time trends of greenhouse gas emissions (GHGE), land use (LU), and water use (WU) of diets of children and adolescents, and 3) to analyze the associations of dietary GHGE, LU, and WU with nutrient adequacy...

Food and nutrition-related factors have the potential to impact development of autism spectrum disorder (ASD) and quality of life for people with ASD, but gaps in evidence exist. On November 10, 2022, Tufts University's Friedman School of Nutrition Science and Policy and Food and Nutrition Innovation Institute hosted a one-day meeting to explore the evidence and evidence gaps regarding the relationships of food and nutrition with ASD. This meeting report summarizes the presentations and deliberations from the meeting...

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BACKGROUND: Hypertension is an important risk factor for cardiovascular disease. Interventions with dietitians can help modify dietary intake and reduce hypertension risk. OBJECTIVE: To examine the research question: In adults with pre-hypertension or hypertension, what is the effect of medical nutrition therapy (MNT) provided by a dietitian on blood pressure (BP), cardiovascular risk and events and anthropometrics compared to standard care or no intervention? METHODS: MEDLINE, CINAHL and Cochrane Central databases were searched for randomized controlled trials (RCTs) published in peer-reviewed journals from 1985-2022...

BACKGROUND: Fatty acids may influence lean tissue volume and skeletal muscle function. We previously reported in young lean participants that overfeeding polyunsaturated fat (PUFA) compared with saturated fat (SFA) induced greater lean tissue accumulation despite similar weight gain. OBJECTIVE: In a double-blind randomized controlled trial (RCT), we aimed to investigate if the differential effects of overfeeding SFA and PUFA on lean tissue accumulation could be replicated in individuals with overweight, and identify potential determinants...

BACKGROUND: Previous studies showed that a reduced plasma concentration of the amino acid glycine (Gly) is associated with intra-abdominal obesity, but the mechanism remains unclear. The study aimed to investigate whether lower Gly concentrations in older adults are independently associated with (visceral) adiposity, age, sex, presence of chronic disease, and glucose intolerance, and whether they are caused by a reduced whole-body production (WBP) and/or increased Gly disposal capacity...

BACKGROUND: Evidence regarding the relationships of serum 25-hydroxyvitamin D (25[OH]D) with cardiovascular diseases (CVD) and mortality among patients with chronic kidney disease (CKD) is limited and inconsistent. OBJECTIVE: This study aimed to investigate the associations between serum 25(OH)D and CVD incidence and mortality among patients with CKD. METHODS: This prospective study included 21,507 participants with CKD and free of CVD in the UK Biobank...

BACKGROUND: Prospective observational data revealed lower cardiovascular disease (CVD) incidence with modelled replacement of saturated fatty acids (SFA) from total meat by total dairy, but it is unknown what the associations are of replacing SFA from types of meat by types of dairy with CVD incidence. OBJECTIVE: To investigate the associations of replacing SFA from total, red, processed and poultry meat by SFA from total dairy, milk, cheese, and yogurt with the incidence of CVD...

BACKGROUND: With the growing popularity of plant-based meat analogues (PBMAs), an examination of their effects on health is warranted in an Asian population. OBJECTIVE: This research investigated the impact of consuming an omnivorous animal-based meat diet (ABMD) compared to a PBMAs diet (PBMD) on cardiometabolic health among adults with elevated risk of diabetes in Singapore. METHODS: In an 8-week parallel design randomized controlled trial, participants (n=89) were instructed to substitute habitual protein-rich foods with fixed quantities of either PBMAs (n=44) or their corresponding animal-based meats (n=45; 2...

BACKGROUND: Hypomagnesemia is commonly observed in individuals with diabetes, but how diabetes medications alter magnesium (Mg) status remains unclear. OBJECTIVE: We aimed to 1) examine the association between diabetes medication and hypomagnesemia and 2) evaluate whether serum Mg mediates the association between diabetes medication and Homeostatic Model Assessment for Insulin Resistance (HOMA-IR) in a prospective cohort. METHODS: Adults from the Boston Puerto Rican Health Study were included (n=1106)...

BACKGROUND: The partially hydrogenated oil (PHO) prohibition came into effect in Canada in September 2018 to reduce the intakes of total trans fatty acids (t-TFA) and industrially produced TFA (i-TFA). OBJECTIVE: We aimed to estimate the red blood cell (RBC) proportions of t-TFA (primary objective) and total 18:1 TFA (secondary objective) of adults in Canada before the PHO prohibition and to identify the population subgroups at risk of higher TFA intakes. DESIGN: We pooled data from 4,025 adult participants of the cross-sectional Canadian Health Measures Survey cycles 3 and 4 (2012-2015)...