A Northwestern University study in Evanston, IL, shows that stopping food intake at least three hours before bedtime improves key markers of cardiometabolic health. Thirty-nine overweight adults aged 36-75 participated in a 7.5-week trial. One group maintained usual eating; the other avoided food for three hours before sleep-keeping total calories unchanged.
The fasting group saw a 3.5% drop in nighttime blood pressure, a 5% reduction in nighttime heart rate, improved day-night heart rhythm, and better daytime blood sugar control. Researchers observed enhanced pancreatic response to glucose-suggesting improved insulin dynamics.
Dr. Phyllis Zee, lead sleep medicine researcher on the study, emphasized timing’s role: “It’s not only how much and what you eat, but also when you eat relative to sleep.” The protocol achieved 90% adherence, positioning it as a scalable, non-pharmacologic intervention. Larger multi-center trials are planned.