Researchers report that extending the overnight fast by a few hours before sleep may significantly improve cardiovascular and blood sugar markers.
By yourNEWS Media Newsroom
A new clinical study suggests that finishing meals at least three hours before bedtime, combined with reduced evening light exposure, may improve key indicators of heart and metabolic health without requiring dietary changes or calorie restriction.
The research, conducted by the Northwestern University Feinberg School of Medicine and published in Arteriosclerosis, Thrombosis, and Vascular Biology, followed 39 overweight or obese adults between the ages of 36 and 75 in a randomized trial examining the effects of meal timing aligned with sleep cycles.
Participants in the intervention group extended their overnight fasting window by two to three hours, ensuring their final meal occurred at least three hours before bedtime. This resulted in a fasting period of approximately 13 to 16 hours. Both the intervention and control groups were instructed to dim lighting in the hours leading up to sleep.
Researchers reported measurable improvements among those who followed the adjusted eating schedule. Nighttime blood pressure decreased by 3.5 percent, while heart rate during sleep dropped by approximately 5 percent. Participants also demonstrated improved heart rate variability, an indicator of cardiovascular function, and better blood sugar control the following morning.
The study found that these benefits occurred without changes in calorie intake, weight, or diet composition, suggesting that the timing of food consumption relative to the body’s internal clock plays a significant role in metabolic regulation.
Lead author Daniela Grimaldi said, “Timing our fasting window to work with the body’s natural wake-sleep rhythms can improve the coordination between the heart, metabolism and sleep.”
Researchers attribute the observed effects to circadian biology. As the body prepares for sleep, melatonin levels rise, energy expenditure decreases, and physiological processes shift toward recovery. Eating late in the evening may disrupt these processes by forcing continued metabolic activity during a period typically reserved for rest.
The study also noted a high adherence rate of nearly 90 percent, indicating that the intervention was feasible for participants without requiring significant lifestyle disruption. Unlike restrictive diets, the approach focused on adjusting meal timing based on individual sleep schedules rather than fixed eating windows.
Investigators said the findings add to existing research on time-restricted eating by emphasizing the importance of aligning fasting periods with sleep cycles rather than focusing solely on fasting duration.
While the results are considered promising, researchers cautioned that the study included a relatively small sample size and relied on short-term observations. They also noted that extended fasting may not be appropriate for all individuals, including those with certain medical conditions.
Further studies are planned to evaluate the long-term effects of sleep-aligned fasting in larger and more diverse populations, including individuals with hypertension and diabetes.
The findings suggest that modest changes to meal timing—such as avoiding late-night eating—may offer a practical, low-cost strategy to support cardiovascular and metabolic health.
Source: Natural News
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