A study published by the American Heart Association reports the approach improved "daytime and nighttime cardiometabolic health."
A 2025 study found that eating at night was linked with disrupted sleep, and even unpleasant dreams. Generally, it makes sense that nighttime noshing could cause blood sugar levels to spike in a way that could, in fact, make it harder to unwind into deep, rejuvenating rest.
Now a study published February 12, 2026 in the American Heart Association’s Arteriosclerosis, Thrombosis, and Vascular Biology journal found the physiologic effects of evening fasting also seemed to show measurable results to heart and metabolic health.
The study was led by five researchers at the Department of Neurology, Center for Circadian and Sleep Medicine at Northwestern University’s Feinberg School of Medicine. Involving 39 participants between ages 36 to 75 who were considered overweight or obese, the team implemented “an extended overnight fasting intervention (13–16-hour fasting) or a control condition (habitual fast of 11–13 hours).” The participants also dimmed their lights and stopped all food consumption three hours before bedtime.
As reported by HealthDay, after 7.5 weeks, main findings among those in the “extended overnight” fasting group included:
- Blood pressure showed better “dipping” during sleep—a known marker of cardiovascular health. Specifically, this improved by an average 3.5%.
- Heart rate rhythms improved overnight, dropping an average 5%. Lowered heart rate is considered an indication that the heart is being forced to work less hard to circulate blood through the body.
- Blood sugar regulation improved during the day. The researchers reported that “their pancreas responded more effectively, suggesting improved insulin release and steadier blood sugar levels.”
While the group’s size was small and the study period only lasted a couple months, the research team reports that 90% of the participants stuck with this framework following the study. This, along with the observations that were made, may help support the notion that making a marked difference to health health can come from simple and actionable behavior changes.
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