When to Stop Eating Before Bed for Heart Health, Per Scientists
For years, health experts have highlighted the importance of timing when it comes to eating, suggesting that stopping food intake a certain period before bedtime can offer benefits ranging from improved sleep and reduced acid reflux to potential weight loss. Now, emerging research suggests another significant advantage: a positive impact on heart health.
When to Stop Eating for a Healthier Heart
A new study published in Arteriosclerosis, Thrombosis, and Vascular Biology investigated the effects of overnight fasting. Researchers examined 39 individuals between the ages of 36 and 75 with overweight or obesity. Participants followed either an extended overnight fast of 13 to 16 hours, or a “habitual fast” of 11 to 13 hours, for a period of 7.5 weeks. All participants dimmed the lights three hours before bedtime.
The results indicated that those who practiced the extended overnight fast—stopping food intake at least three hours before bed—experienced notable heart-healthy benefits. Specifically, nighttime blood pressure decreased by 3.5% and heart rate fell by 5% in this group. This pattern of declining blood pressure and heart rate during sleep, known as nocturnal dipping, is considered a healthy indicator, according to study co-author Phyllis Zee, M.D., director of the Center for Circadian and Sleep Medicine at Northwestern University’s Feinberg School of Medicine.
Why Timing Matters
The study suggests a link between the timing of food intake and cardiovascular health. Researchers found that participants who stopped eating three hours before bed also demonstrated improved blood sugar management and insulin sensitivity. The researchers concluded that this “sleep-aligned time-restricted eating approach” is a potentially accessible lifestyle intervention for improving cardiometabolic function.
Experts note that eating a meal close to bedtime can interfere with sleep. Sonya Angelone, Ph.D., R.D.N., a nutritionist based in San Francisco, explains that the body is “primed for sleep, not to digest food at night.” the rise in the sleep hormone melatonin, which begins two to three hours before bed, influences cardiovascular function. Eating too close to bedtime can also temporarily increase blood pressure and potentially lead to acid reflux, according to Angelone.
The Connection Between Sleep and Health
The study underscores the broader importance of sleep for overall health. Lack of sleep has been linked to higher blood sugar levels, poor blood sugar control, and an increased risk of conditions like high blood pressure, type 2 diabetes, heart disease, and depression. Research also suggests that eating too much too close to bedtime may impact cortisol levels and body composition, and that the body processes calories more efficiently earlier in the day.
Frequently Asked Questions
What did the study participants do?
Researchers had 39 people with overweight or obesity between the ages of 36 and 75 do an extended overnight fast of 13 to 16 hours or a “habitual fast” of 11 to 13 hours for 7.5 weeks. Both groups dimmed the lights three hours before bed.
What benefits were observed in the extended fasting group?
Participants who stopped eating at least three hours before bed experienced a 3.5% drop in nighttime blood pressure and a 5% decrease in heart rate. They also showed improved blood sugar management and insulin sensitivity.
Is it necessary to strictly adhere to a three-hour rule every night?
Researchers acknowledge that adhering to the three-hour rule every night may not be feasible for everyone. They suggest gradually shifting eating habits and prioritizing long-term patterns over perfection.
Could incorporating a consistent eating schedule, with a three-hour buffer before bedtime, be a simple yet effective step towards prioritizing your heart health?