TL;DR: A meta-analysis pooling 63 studies and 265,079 people found that cannabis users had about twice the odds of committing violence as non-users (2.05 times in the general population, 2.49 times among psychiatric patients). The gap shrank to 1.17 times in studies that followed people over time. The design shows an association, not that cannabis …
TL;DR: In an online survey of 126 mothers of toddlers in Taiwan, mothers who reported more depressive symptoms also tended to describe their toddler’s sleep as more of a problem and to report longer times to fall asleep. The link with perceived sleep problems showed up in families where the toddler shared a sleeping surface …
TL;DR: In a small German study of 24 refugee women with trauma symptoms, scores on three symptom questionnaires stayed flat during an 8-week wait, then dropped after 8 weekly dance movement therapy sessions. The group’s average PTSD checklist score slipped just under the usual clinical cutoff. There was no separate comparison group, so the study …
TL;DR: A review of 17 randomized trials found that women who exercised had lower depression scores than women given usual care, both during pregnancy and after birth. The evidence is rated low to very low certainty, and the studies varied a lot. For anxiety during pregnancy, the review found no clear difference. Key Findings Depression …
TL;DR: In a controlled Dutch feeding trial, 41 healthy young adults ate a diet made almost entirely of ultra-processed foods for two weeks, twice. Afterward, the gut hormones that help signal fullness responded to a test meal about the same as they had on the participants’ usual diets. Hunger and fullness ratings shifted only a …
TL;DR: In a crossover trial of 119 adults living near busy highways, a month with a real HEPA air purifier did not clearly speed up a thinking test across the whole group. Among adults 40 and older, though, participants finished the harder test 12% faster after the real-purifier month than after the fake-purifier month. That …
TL;DR: Researchers used wrist trackers to estimate the sleep stages of 95,559 British adults, then followed their hospital records for about 9 years. Adults who spent more time in REM sleep had lower risk of 83 different diagnoses, and adults sleeping under 5 hours a night had higher risk of many conditions than those sleeping …
TL;DR: A 2026 randomized trial in Journal of Medical Internet Research gave adults with elevated depression symptoms the same coach-led group skills program through either a VR headset or a flat screen. Depression scores fell slightly faster in the VR group over 8 weeks. Key Findings The VR group improved a little faster: Depression scores …
TL;DR: A 2026 medRxiv preprint found that pupil dilation measured inside a virtual reality (VR) headset increased as working-memory load rose in healthy adults, was reproducible 60–90 days later in 33 returnees, and was smaller under the highest load in cognitively impaired patient cohorts than in 81 healthy controls. Key Findings Forty-three healthy adults completed …
TL;DR: A 2026 randomized training study in Nature Communications found that sensory-guided joint learning—a combination of performance-triggered wrist vibration, Copy/New strategy cues, and an adaptive electroencephalography (EEG) decoder—produced a 19.0-percentage-point improvement in motor-imagery brain-computer interface (BCI) accuracy in healthy BCI-naĂŻve adults, versus 6.3 and 3.0 points in two control groups. Key Findings Thirty-one healthy adults …
