Friday 23 October 2026 · 5 small stories to take into your day
Today in 30 seconds
DHA fish oil did not beat placebo on memory in 365 older adults over 2 years
Over 8 hours of weekly activity linked to near-flat memory scores in Parkinson's
US coffee calories rose from 43 to 60 a day between 2003 and 2018
EatTrial in people
1High-dose fish oil did not protect memory over two years
What happened. Researchers at Keck Medicine of USC gave 365 adults aged 55 to 80 a daily DHA fish oil supplement or a placebo for two years. All rarely ate fish, and 47% carried APOE4, a gene variant tied to higher Alzheimer's risk. In the supplement group, DHA in the fluid around the brain rose an average 17% after six months. Yet memory and thinking were no better than with placebo.
“We all wish there was a silver bullet for preventing Alzheimer's”
Hussein Naji Yassine, director of the USC Center for Personalized Brain Health and lead investigator
Why it matters. Omega-3 pills are a popular way to try to guard the brain. In this group, the supplement reached the brain but did not help memory or stop the hippocampus from shrinking. It does not show that eating fish has no value.
Randomised, double-blind trial; DHA pills alone, in older adults at higher Alzheimer's risk
2More active people with Parkinson's had slower symptom decline
What happened. A team including Dong-Woo Ryu of the University of Cincinnati followed 294 adults with mild to moderate Parkinson's, aged 66 on average, for up to seven years. On a 30-point thinking and memory test, the least active group, who reported up to 4 hours a week, lost an estimated 0.478 points a year. Those reporting more than 8 hours lost only 0.007 points.
“Our study found physical activity may have dual benefits, with associations with slower declines in movement and cognition.”
Dong-Woo Ryu, study author, University of Cincinnati
Why it matters. For people living with Parkinson's, more activity was linked to slower declines in both thinking and movement. The differences were small and show a link, not cause and effect, though the author says they may matter more over time.
Observational; activity was self-reported; small differences, more studies needed
3US coffee intake stayed the same, but its calories rose nearly 40%
What happened. Researchers at Tufts University analysed diet reports from 30,000 US adults aged 20 and older, collected in national surveys from 2003 to 2018. Coffee intake stayed about the same, but daily calories from coffee rose from 43 to 60. By 2018, non-dairy creamer supplied 18.5 calories a day, more than sugar at 16 or dairy milk at 11.
“Coffee consumption has been associated with several health benefits.”
Fang Fang Zhang, senior author, Friedman School at Tufts University
Why it matters. The change came from what people put in the cup, not the coffee itself. Small daily add-ins can quietly shift a familiar habit over the years, and that is easy to miss.
Survey data; people recalled two days of eating and drinking, which can be inaccurate
4A psychologist says AI partners can ease loneliness but not replace people
What happened. Michigan psychologist Michele Leno argues in Psychology Today that AI romantic companions can ease loneliness and offer a low-risk way to practise relationship skills. She cites a 2023 Gallup poll in which 27% of people aged 19 to 29 felt very or fairly lonely. She sees warning signs when someone prefers the AI to people, hides it, feels upset without it or finds daily life disrupted.
“Many AI programs are built to mimic the warmth, empathy, and attentiveness people expect from a human companion.”
Michele Leno, licensed psychologist in Michigan
Why it matters. Chat apps built to sound warm are easy to lean on. In her view, they help most as practice, and become a concern when they push real people out of daily life.
Opinion column, not new research; the loneliness poll is from 2023
5Reefs grew up to 2.5 times faster around islands full of seabirds
What happened. A study led by Prof Nick Graham at Lancaster University looked at 28 islands in the Pacific and Indian oceans. Coral reefs near islands with thriving seabird colonies grew up to 2.5 times faster than reefs near islands overrun by rats. The roots of native plants also helped hold the islands together.
“Seabirds deposit large quantities of nutrients through their droppings, fertilising the reef.”
Prof Nick Graham, lead author, Lancaster University
Why it matters. Low-lying islands face rising seas. Bringing back seabirds and native plants could help restored atolls keep pace with a 2C sea level rise projection, though cutting emissions fast still matters too.
Reported second-hand in a news roundup; journal not named
