A new study from researchers at Northwestern University has found that avoiding meals at least three hours before going to bed may significantly improve blood pressure and blood sugar levels.
The findings suggest that meal timing plays a key role in heart health and metabolic balance.
The research was published in the medical journal Arteriosclerosis, Thrombosis, and Vascular Biology, highlighting the growing evidence that when people eat may be just as important as what they eat.
Researchers explained that the human body follows a natural internal clock known as the Circadian Rhythm, which regulates sleep cycles, hormone production, metabolism, and heart function.
Eating late at night can disrupt this system because the body continues digesting food when it should be preparing for rest.
This disruption may negatively affect blood pressure, blood sugar control, and overall metabolic health.
During the study, participants were instructed to stop eating at least three hours before bedtime. They were also advised to keep lights dim in the evening and extend their nightly fasting window to between 13 and 16 hours.
How research was conducted
The study included 39 obese adults aged between 36 and 75, all of whom were considered at risk of developing heart disease or diabetes.
Participants were divided into two groups and monitored for around seven and a half weeks.
According to the study’s lead author, Daniela Grimaldi, aligning eating and sleeping schedules with the body’s natural rhythm helps improve coordination between the heart, metabolism, and sleep patterns.
Co-author Phyllis Zee noted that the health benefits observed in the research were linked not only to the type or quantity of food, but also to when it was consumed.
Key findings from study
Researchers observed several notable improvements among participants who followed the early dinner routine.
Participants experienced a 3.5% reduction in nighttime blood pressure and about a 5% drop in heart rate during sleep.
The study also found improvements in insulin efficiency and glucose tolerance, indicating better blood sugar regulation.
Levels of the stress hormone cortisol were reduced at night, which researchers say may help ease strain on the heart.
Experts noted that these changes could potentially lower the risk of developing high blood pressure and diabetes over time.
Expert advice for healthier night routines
Based on the findings, researchers recommend a few simple habits to support better metabolic health:
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Finish dinner at least three hours before bedtime
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Eat a light and balanced evening meal
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Reduce bright lights and screen exposure at night
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Drink herbal tea or lukewarm water instead of late-night snacks if hunger occurs
