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Findings worth knowing about as they land, with the study behind them and an honest read of how much it shows. Association is not cause, and these say which one they are.
- News
Eating about 2 ounces of peanuts a day improved brain insulin response in older adults
A 16-week randomized crossover trial of 31 older adults found 60 grams of peanuts a day improved how a memory-linked brain region responded to insulin, with modest gains in blood flow and verbal memory in a companion paper. The trial was funded by a peanut industry group and the sample is small, so this is a promising signal, not proof peanuts protect against dementia.
7 min read7 sources
- News
Natural trans fat in dairy did not raise heart disease risk in a new review
A review of 22 studies found the natural trans fat in butter, cheese and milk was not linked to higher heart disease or diabetes risk, unlike the industrial trans fat the FDA pushed out of food. It was funded by dairy industry groups, a reason to wait for independent replication.
7 min read8 sources
- News
Vitamin D and cognition: reading the 2026 finding carefully
Older adults with mild cognitive impairment taking 5,000 IU daily scored over 13% higher on a cognitive test. That is a striking result in a narrow group, and the distinction matters.
4 min read1 source
- News
Low blood magnesium, and high blood magnesium, are both linked to higher dementia risk
A records study of more than 325,000 US adults over 50 found repeatedly low blood magnesium linked to a 33% higher rate of new dementia diagnoses, and high blood magnesium to a higher rate too. It is drawn from health records, not a trial, and echoes a smaller 2017 study.
7 min read4 sources
- News
A joint supplement millions take is linked to faster Alzheimer's progression
A University of Florida study found glucosamine use linked to a 25% higher rate of progressing from mild cognitive impairment to Alzheimer's, and 25% higher mortality in established dementia. It is a records analysis, and an earlier study found the opposite in people without dementia yet.
7 min read9 sources
- News
A sugar found only in red meat is linked to a 63% higher diabetes risk
A preliminary study of nearly 90,000 adults found the people eating the most Neu5Gc, a sugar unique to red meat, had 63% higher odds of type 2 diabetes than those eating the least. It has not been peer reviewed, and the signal weakened once total red meat intake was factored in.
6 min read6 sources
- News
Low vitamin D before breast cancer surgery, more pain and more opioids after
A study of 184 women found those with vitamin D below 30 nmol/L were far more likely to report moderate to severe pain in the first 24 hours after a mastectomy, and used substantially more opioid painkiller. It is one hospital's data, not a supplementation trial, but the gap was large.
6 min read5 sources
- News
Caffeine can quietly cut your deep sleep, even when you feel fine
A 2026 review of sleep EEG research found caffeine consistently suppresses slow-wave activity, the brain's deepest sleep stage, even on nights people feel rested. A meta-analysis of 22 controlled trials found caffeine cut total sleep time by 35 minutes and lowered slow-wave sleep.
6 min read6 sources
- News
Do selenium supplements raise cancer risk? A 15-year trial follow-up weighs in
A long-term follow-up of the largest selenium supplement trial ever run found no statistically significant rise in Hodgkin lymphoma, multiple myeloma or ALS in men who took 200 micrograms a day for years, though the estimates leaned toward higher risk. Selenium did significantly lower melanoma risk.
6 min read4 sources
- News
Whole grains and heart health: how much actually moves the numbers
A meta-analysis of 87 randomized trials found the biggest improvements in weight, waist size, cholesterol and blood pressure at 60 to 100 grams of whole grain a day, roughly four to six servings. Below that the effect was smaller, and above it, it largely leveled off.
6 min read5 sources
- News
Newborn vitamin K refusals jumped 57% in six months
A records review of more than a million US births found newborns not given a vitamin K shot rose from 5.2% to 8.1% in the first half of 2026. Infants who skip it are 81 times more likely to develop life-threatening bleeding, per the American Academy of Pediatrics.
7 min read4 sources
- News
Vitamin B12 and birth defects: the father's level counts too
A cohort study found low vitamin B12 in either parent before conception linked to more birth defects in their children, with a dose-response pattern for mothers and fathers alike. It is observational, but it puts the father's status in a conversation usually aimed only at the mother.
6 min read3 sources
- News
The new US dietary guidelines: what actually changed
The 2025–2030 guidelines raised the protein recommendation by roughly half, replaced the added-sugar percentage with a per-meal gram limit, and kept the saturated fat cap exactly where it was, while flipping the food pyramid to feature the foods that cap restricts.
5 min read4 sources