Diet can have a big impact on your overall health, but it’s not just about what you eat—when you eat matters too, which is why meal timing has become such a big talking point lately. Some people swear that stopping eating by a certain time before bed supports better sleep, weight loss, and gut health. But new research also suggests it could help your heart, too.
The study, which was published in Arteriosclerosis, Thrombosis, and Vascular Biology, had 39 people with overweight or obesity 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 had to dim the lights three hours before bed.
Meet the experts: Phyllis Zee, M.D., study co-author, director of the Center for Circadian and Sleep Medicine, and chief of sleep medicine in the department of neurology at Northwestern University’s Feinberg School of Medicine; Jessica Cording, M.S., R.D., is the author of The Little Book of Game-Changers: 50 Healthy Habits for Managing Stress & Anxiety; Sonya Angelone, Ph.D., R.D.N., a nutritionist and registered dietitian based in San Francisco; Ellen Stein, M.D., associate professor of medicine and acting clinical director of gastroenterology at Rutgers Robert Wood Johnson Medical School.
Compared to the “habitual fast” group, people who stopped eating at least three hours before bed experienced a range of benefits linked with better heart health.
This group saw their nighttime blood pressure drop by 3.5% and their heart rate fall by 5%. The lowering of both of these metrics during sleep is called nocturnal dipping—and is considered to be a healthy pattern, explains Phyllis Zee, M.D., study co-author, director of the Center for Circadian and Sleep Medicine, and chief of sleep medicine in the department of neurology at Northwestern University’s Feinberg School of Medicine. “Lack of dipping is a risk for cardiovascular disease,” she adds.
The participants who stopped eating three hours before bed also had better blood sugar management and insulin sensitivity.
So why might a mealtime cutoff help your heart? Experts explain what might be behind the link—and what this means for your eating schedule.
When to stop eating before bed for better heart health
In this particular study, the participants who stopped eating three hours before bed had improvements across their blood pressure, heart rate, and blood sugar management—all without cutting calories.
That aligns with advice from Ellen Stein, M.D., associate professor of medicine and acting clinical director of gastroenterology at Rutgers Robert Wood Johnson Medical School. “I recommend that patients eat healthy meals and leave at least two hours, but preferably three hours, between their last meal and lying down for bed,” she says. “The sleep quality improves and the resting activities of the body are able to achieve peak performance.”
But doesn’t this mean you’ll go to bed hungry? Nope—not if your diet is on point earlier. “If you are eating a sufficiently healthy diet throughout the day, you should remain comfortable and nourished,” Dr. Stein says.
Why does how long you eat before bed matter?
The concept of avoiding food before bed isn’t a new one. It’s been recommended across a range of medical specialties for a variety of reasons.
“Eating a meal, especially a large meal, close to bedtime can interfere with sleep,” says Sonya Angelone, Ph.D., R.D.N., a registered dietitian based in San Francisco. “The body is primed for sleep, not to digest food at night.”
The sleep hormone melatonin rises about two to three hours before bed, which influences your cardiovascular function, Dr. Zee says. Stopping eating three hours before bed “aligns well with the person’s circadian rhythm,” she says.
Your blood pressure tends to temporarily increase after a big meal, which could disrupt sleep, points out Jessica Cording, M.S., R.D., author of The Little Book of Game-Changers: 50 Healthy Habits For Managing Stress & Anxiety. Not only that, your body tends to kick into overdrive to digest food after a solid meal, which can raise blood sugar, Cording says. “Sometimes that can make you feel temporarily alert, which can interfere with sleep,” she adds.
Eating close to bed may raise the risk of developing acid reflux, which may hinder sleep, too, Angelone points out.
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“To get the best quality sleep and to have the best possible digestion, a period of time before bed without eating allows digestion to complete its stomach emptying before you recline—reducing reflux, regurgitation, and acid symptoms in general,” Dr. Stein says.
Trying to fall asleep when your stomach is full “isn’t as easy for the body” as when it’s emptier, she says. “It still needs active time to process the food,” Dr. Stein continues. “The body will not achieve a deep and restful sleep with a big meal right before bed.”
Is it okay to have a snack before bed?
It depends. “A small snack might be okay, but that will still reduce the total number of hours spent resting without food,” Dr. Stein says. “The time that the body has in between meals is important to clear away the excess glucose and reach homeostasis.”
For people trying to lose weight, a late-night snack disrupts the natural rise and fall of insulin in the body, too, Dr. Stein points out. That can interfere with metabolism and raise the risk of weight gain, which can tax the heart.
“That said, if your body cues say you need to eat and are hungry, or if you have a condition where you are trying to gain some weight for your health, some folks can benefit from a snack to avoid breakdown of muscle or low blood sugars at night,” Dr. Stein says.
What’s more, going to sleep feeling famished can also hurt your sleep too, since it can be tricky to relax if all you can think about is your rumbling belly. If you are going to have a snack before bed, you may want to avoid foods that are high in fat or sugar, which can disrupt sleep, too.
The bottom line
While the research is promising, it may not be reflective of the general population, and more needs to be done. And it’s by far not the only thing you can do to protect your heart, either: The American Heart Association’s Life’s Essential 8 breaks down heart-healthy lifestyle behaviors to follow, which include eating a balanced diet, exercising regularly, avoiding tobacco, sleeping at least seven hours a night, managing your cholesterol, keeping blood sugar in check, and staying on top of your blood pressure.
But if you’re struggling with sleep issues, trying to incorporate some of the findings might help you snooze a little better. As with any lifestyle changes, though, keeping it gradual is the name of the game.
Stopping eating three hours before bed can feel daunting for some folks, which is why Angelone recommends changing your habits slowly. “If you are used to a bedtime snack, have it just a little earlier until you are eating three hours or more from bedtime,” she says. “Gradually shift your last food intake by 15 minutes a day.”
Cording also suggests giving a closer look at what you’re eating earlier in the day—and adjusting if you’re coming up short. “A common issue I’ve come across is when someone is not eating enough during the day and is consciously or unconsciously saving their calories for the end of the day,” she says. “When someone gets into a pattern when they’re eating a lot at night, it sets the stage for metabolic issues.”
And consider the makeup of your final meal of the day, too: Angelone stresses the importance of having a mix of protein, healthy fat, and fiber at dinner to keep you feeling fuller and stabilize blood sugar. “A balanced meal that’s not too heavy is ideal,” Cording says.
If you can’t do this every night, don’t stress it. “There will be times in your life where you don’t have two to three hours before bed,” Cording says. “Give yourself some grace. It’s not necessarily about getting it perfect every day. It’s about long-term patterns over the lifespan.”
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