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Health warnings on vapes changed people's choices, but there was a catch

In a Canadian discrete choice experiment involving 2,961 e-cigarette users and nonusers, researchers examined how health warnings, nicotine strength, plain packaging, and prices influenced preferences for vaping products, heated tobacco, and cigarettes. Warnings on all three product categories increased the predicted probability of choosing none from 50% to 65% among nonusers and from 10% to 18% among users, while lower nicotine strength made vape pods more appealing and price increases produced smaller, mixed effects.

1 Nov 2026

Why you still want dessert even when you're completely full

A 2026 narrative review examines how food liking (pleasure) and wanting (motivation) interact with hunger and satiety to influence food choices, explaining why certain foods may remain appealing even after a satisfying meal. The authors report that food reward can change independently of hunger under specific conditions, but evidence remains limited that these changes reliably predict subsequent eating or improve weight-management outcomes.

1 Nov 2026

The type of fiber you eat shapes how gut bacteria feed and work together

A 2021 review examined how the chemical structure and physical properties of dietary fiber influence which gut bacteria can break it down and how microbial species compete and cooperate during fermentation. The authors described how these interactions contribute to short-chain fatty acid production, while emphasizing the need for further research involving intact plant foods to understand their implications for human health.

1 Nov 2026

Eating walnuts was linked to higher IgG levels, but what does that mean for health?

A two-year randomized trial involving 474 older adults found that daily consumption of 30–60 grams of walnuts was associated with 6% higher total serum IgG concentrations compared with a control diet, with an 11% difference observed among US participants. Walnut consumption did not significantly affect IgM, MDA-LDL or MDA-LDL-specific antibodies, and whether the modest IgG difference has meaningful cardiovascular benefits remains unknown.

1 Nov 2026

Extreme heat and cold hit some people far harder, and it's not just about illness

Researchers analysing 285,444 adults in Finland and the UK found that excess mortality associated with extreme heat and cold was more than tenfold higher among people with both pre-existing medical conditions and socioeconomic disadvantage than among those with neither or only one vulnerability. Climate modelling suggested that warming from approximately 1°C to 4°C could increase the proportion of deaths attributable to extreme temperatures from around 1% to more than 5% in both countries.

1 Nov 2026

Why do we turn to comfort food? A survey of 1,203 adults offers clues

A cross-sectional study of 1,203 UK adults found that stronger expectations of positive emotions from high-fat, salt and/or sugar foods were weakly associated with poorer diet quality and more frequent comfort eating. Negative emotional expectations about many foods also tracked with comfort eating, but the study did not establish whether eating these foods actually changed mood.

29 Oct 2026

Multivitamins boost key vitamin levels, but do they improve your health?

A scoping review of 157 clinical trial reports found that multivitamins consistently improved circulating levels of folate, vitamin B6, and vitamin B12, while other nutritional and clinical effects varied by formulation, population, and baseline nutritional status. Selected prenatal and cognitive outcomes improved in some trials, but evidence for cardiovascular disease prevention was largely negative, and the review could not establish the overall certainty of clinical benefits.

29 Oct 2026

Is AI changing what gives our lives meaning?

A rapid review of 18 publications examines how artificial intelligence, immersive technologies, and other digital tools influence identity, existential inquiry, and the search for meaning. The findings suggest that digital literacy and knowledge management may support more reflective engagement with technology, although the evidence remains varied and does not establish causation.

29 Oct 2026

Worried nuts will cause weight gain? A large review puts that concern in perspective

A systematic review and meta-analysis of randomized trials found that eating nuts modestly reduced body fat and improved cholesterol levels without significantly changing body weight. The review did not establish that nuts rich in monounsaturated fats offered greater body-composition benefits than those rich in polyunsaturated fats.

29 Oct 2026

Can broccoli sprouts help with insulin resistance? New review offers clues

A review published in the British Journal of Nutrition examines how carotenoids and bioactive compounds in Brassicaceae microgreens may influence obesity, insulin resistance, and type 2 diabetes through metabolic and inflammatory pathways. Small human trials involving broccoli sprouts have reported improvements in selected metabolic markers, but larger, longer-term studies are needed to establish their clinical benefits.

29 Oct 2026

Fish, shellfish or seaweed? A Korean study found striking differences in chemical exposure

A national study of 4,279 Korean adults found that higher finfish consumption was associated with increased blood concentrations of PFAS, PCBs, and mercury, while shellfish showed narrower associations with three PFAS. Persistent chemical mixtures were also associated with modest increases in liver health biomarkers, and mediation analysis identified a positive PFAS-related pathway, although finfish intake was not significantly associated with GGT overall.

29 Oct 2026

Limited app use adds a twist to a nurse-led dementia risk trial

A cluster-randomized trial involving 403 Australian adults aged 45–65 found that a 12-month nurse-led behavioral intervention supported by a mobile app modestly improved estimated dementia risk scores compared with brief counseling and usual care. The study found no significant improvements in cognitive performance or other secondary outcomes, leaving its long-term effects on dementia prevention uncertain.

28 Oct 2026

Identical twins showed a survival divide when only one had Parkinson’s

Researchers followed 54 twin pairs discordant for Parkinson’s disease and found substantially higher 10-year mortality among affected twins, including in genetically identical pairs. They also observed more frequent constipation among affected twins, but dietary and nutritional differences were limited, with secondary findings requiring confirmation.

28 Oct 2026

Ketones may change sleep patterns, but not always for the better

Researchers reviewed animal and human studies and found that ketone bodies may affect sleep stages through energy metabolism and cellular signaling, with the clearest direct evidence involving acetoacetate in mice. They reported mixed human findings and called for controlled studies to separate ketone-specific effects from changes linked to diet, disease, circadian timing, and physiological stress.

28 Oct 2026

Plant and animal proteins show opposite effects on testosterone levels

Higher animal protein intake was associated with lower blood testosterone levels, while higher plant protein intake was associated with higher levels, according to a new study from the University of Eastern Finland.

28 Oct 2026

A loneliness trial puts personalized nature-based support on the research agenda

In a randomized trial involving 320 adults experiencing loneliness, researchers found that loneliness scores declined in both a facilitated nature-based group program and an active signposting group, with no significant difference between them at three months. Neither approach significantly improved health-related quality of life, while exploratory analyses suggested that people with lower emotional wellbeing might benefit more from facilitated group activities.

27 Oct 2026

Low vitamin B12 is linked to heart disease. Supplements tell a different story

A narrative review published in Nutrition Journal examines how vitamin B12 deficiency may contribute to cardiovascular disease through elevated homocysteine, endothelial dysfunction, oxidative stress and altered methylation. The authors found that B12 supplementation has not consistently prevented heart attacks or cardiovascular deaths in clinical trials, although combined B-vitamin therapy may modestly reduce stroke risk, particularly in populations without folic acid fortification.

27 Oct 2026

Most adults with obesity did not meet food noise criteria in US survey

Researchers analyzed responses from 3,646 US adults not currently taking GLP-1 medications to assess persistent, unwanted food-related thoughts using a five-item questionnaire. They found that approximately 4% to 9.5% met questionnaire-based criteria for food noise, with higher scores among younger adults, women, and people in higher BMI categories, while cautioning that no clinically validated threshold exists.

27 Oct 2026

Men with lower testosterone at 31 reported good health 15 years later

Researchers analyzed testosterone concentrations measured at age 31 in 2,691 Finnish men and assessed self-reported health, medical conditions, and quality of life at age 46. Men across testosterone quartiles generally reported good health and excellent quality of life, while differences in metabolic and gastrointestinal conditions lost statistical significance after adjustment for waist circumference.

27 Oct 2026

Updated ASTRO guidelines recommend shorter radiation courses for prostate cancer

An updated clinical guideline from the American Society for Radiation Oncology (ASTRO) provides evidence-based recommendations on the use of hypofractionated radiation therapy for patients with localized prostate cancer.

27 Oct 2026