Researchers at Northwestern Medicine have examined the impact of timing an overnight fast to align with an individual's natural sleep-wake cycle, specifically in relation to heart and metabolic health. The study, which focused on middle-aged and older adults at elevated risk for cardiometabolic disease, did not involve calorie reduction but rather emphasized the timing of food intake.
The findings indicated that extending the overnight fasting period by approximately two hours, coupled with avoiding food and dimming lights three hours prior to sleep, resulted in notable improvements in cardiovascular and metabolic markers. Dr. Daniela Grimaldi, the study's lead author, stated that synchronizing fasting with the body's natural rhythms may enhance the relationship between heart health, metabolism, and sleep.
Published in the journal Arteriosclerosis, Thrombosis, and Vascular Biology, the study highlights the significance of when food is consumed, alongside what is eaten, for achieving physiological benefits through time-restricted eating. Dr. Phyllis Zee, a corresponding author, emphasized that timing is crucial for optimizing metabolic regulation.
With only 6.8% of U.S. adults achieving optimal cardiometabolic health in recent years, this research is particularly relevant, as poor cardiometabolic health is linked to chronic conditions like type 2 diabetes and cardiovascular disease. The trial, which included 39 participants aged 36 to 75, found that those who adjusted their meal timing experienced a 3.5% reduction in nighttime blood pressure and a 5% drop in heart rate, indicating a healthier physiological pattern. Participants also showed improved blood sugar control.
The research team aims to refine their protocol and conduct larger multi-center trials to further investigate these findings. The study was funded by several NIH institutes, including the National Heart, Lung and Blood Institute.