#Circadian Rhythm
Articles tagged #Circadian Rhythm on Vitalspell.
Caffeine within 12 hours of bedtime harms sleep, often without you noticing
A randomized crossover trial in Sleep found that 400 mg of caffeine disrupts sleep when consumed within 12 hours of bedtime, while 100 mg is safe up to four hours before bed. Most participants could not tell when caffeine was harming their sleep.
Circadian and gut-brain program improved recovery after rectal cancer surgery
A perioperative behavioral program combining mindfulness, biofeedback, CBT-I, and timed melatonin was associated with lower inflammation, better sleep, and an exploratory survival signal in 184 rectal cancer patients. Two trials from the same Chinese research group now point toward circadian rhythm as a modifiable target in surgical recovery.
Nutrition timing alone not enough for night-shift metabolic health, trial finds
An 8-week crossover trial in female healthcare workers found that protein-and-nutrient-timing guidance modestly improved visceral fat percentage but did not shift inflammatory markers, gut microbiome diversity, or mental health scores. The findings suggest dietary changes alone are insufficient to reverse the metabolic effects of circadian disruption.