Scientists Pin Down When to Stop Eating Before Bed for Heart Health

A study published in Arteriosclerosis, Thrombosis, and Vascular Biology followed 39 people with overweight or obesity for 7.5 weeks. Participants either fasted overnight for 13 to 16 hours or maintained their usual 11-to-13-hour fasting window. Everyone dimmed the lights during the final three hours before sleep. Compared with the usual-fasting group, participants who finished their last food three or more hours ahead of bedtime showed several heart-related improvements without reducing calories.

In that group, blood pressure during the night decreased 3.5%, while sleeping heart rate declined 5%. Blood sugar control and sensitivity to insulin also improved. Phyllis Zee, M.D., explained that lower blood pressure and heart rate during sleep form a healthy pattern known as nocturnal dipping. She also noted that melatonin begins rising roughly two to three hours before bedtime, affecting cardiovascular function, so an earlier final meal fits the body’s circadian timing.

Experts described several possible connections. A large late meal can temporarily increase blood pressure, while digestion may elevate blood sugar and create alertness that disrupts sleep. Eating shortly before lying down can also contribute to acid reflux, regurgitation, and other acid symptoms. A small snack still shortens the food-free resting period, although hunger, low nighttime blood sugar, or a health need to gain weight may make a snack beneficial for some people. The findings may not apply to everyone, and additional research is needed. Heart health also depends on broader factors, including balanced eating, regular exercise, avoiding tobacco, getting at least seven hours of sleep, and managing cholesterol, blood sugar, and blood pressure.