Eating for Better Sleep: Foods and Habits That Improve Metabolic Health

A poor night’s sleep does more than leave you tired. It can change how hungry you feel, how rewarding food seems, and how well your body handles glucose. What you eat, in turn, can influence how quickly you fall asleep and how much deep sleep you get.

That bidirectional relationship is the key. Sleep and nutrition are not separate health projects. They form a feedback loop that can either work against you or support better appetite regulation, metabolism, and recovery.

My discussion with Dr. Marie-Pierre St-Onge drew on her research at Columbia University to examine both sides of that loop. Some of the findings reinforce familiar advice, such as eating more fiber and avoiding large meals close to bedtime. Others are less intuitive: sleep restriction can increase energy expenditure while still promoting weight gain, and men and women may experience different changes in appetite-regulating hormones.

The goal is not to find one perfect food or supplement. It is to understand which changes have meaningful evidence behind them, what that evidence actually establishes, and how to make those changes practical.

Table of Contents

• How Sleep Loss Changes Hunger and Food Choices
• Why Sleep Restriction Can Promote Weight Gain
• Sleep, Blood Sugar, Cortisol, and Cardiometabolic Health
• How Diet Quality Influences Sleep
• Fiber, Saturated Fat, and Sugar Affect Different Aspects of Sleep
• Meal Timing: Move Food Earlier Rather Than Simply Adding Breakfast
• Sleep Health Is More Than an Hour Count
• Snoring, Sleep Apnea, and When to Get Tested
• Functional Foods: Interesting Findings, Not Miracle Solutions
• MCT Oil: A Modest Effect That Depends on Substitution
• Build a Dietary Pattern, Not a Collection of Hacks
• Seed Oils, Corn Chips, and the Importance of the Comparison
• How to Evaluate Industry-Funded Nutrition Research
• A Practical Framework for Better Sleep and Metabolic Health

How Sleep Loss Changes Hunger and Food Choices

Much of the early interest in sleep and obesity came from population studies. People reporting shorter sleep tended to have higher body mass indexes, a greater prevalence of obesity, and more weight gain over time.

One example was the Nurses’ Health Study, which followed women over approximately 14 years. Those reporting five to six hours of sleep experienced more weight gain than those reporting seven to eight hours.

Those observations matter, but they do not establish causation. Short sleep might promote weight gain, excess weight might interfere with sleep, or other factors might influence both. Controlled experiments help separate those possibilities.

A controlled test of sleep and appetite

In one of St-Onge’s studies, participants completed two conditions in a crossover design:

• Adequate sleep opportunity: Nine hours in bed, resulting in roughly seven and a half hours of sleep.
• Restricted sleep opportunity: Four hours in bed, resulting in approximately three hours and 50 minutes of sleep.

Each condition lasted five nights. During the initial controlled-feeding period, participants ate the same foods, in the same quantities, at the same times. That allowed the researchers to examine the effects of sleep without introducing differences in diet.

Later, when participants could choose their own food, they ate approximately 300 additional calories in the short-sleep condition.

Brain imaging also showed greater responses in reward-related regions to food stimuli after sleep restriction. In other words, the increased drive to eat was not simply a matter of having more waking hours available. Food itself appeared more rewarding.

Men and women showed different hormonal responses

The hormonal findings were particularly interesting:

• In men, ghrelin increased. Ghrelin helps stimulate hunger and food intake.
• In women, GLP-1 decreased. Glucagon-like peptide-1 contributes to satiety, helping signal that you have eaten enough.

One way to conceptualize this is that sleep restriction strengthened the accelerator on eating in men while weakening the brake in women.

These were findings from a particular study, not rules that describe every individual. They also illustrate why researchers need to examine sex differences. When all participants were analyzed together, there was no overall ghrelin effect. Separating the results revealed an increase in men that was not present in women. Earlier studies showing increased ghrelin had largely studied men.

The practical point is straightforward: after insufficient sleep, increased hunger or reduced fullness may reflect altered physiology, not a sudden loss of discipline.

Why Sleep Restriction Can Promote Weight Gain

Across studies, sleep restriction consistently tends to increase food intake. A meta-analysis discussed by St-Onge placed the additional intake at roughly 250 to 400 calories per day.

That may not sound dramatic for one day. Repeated over time, however, it can create a meaningful energy imbalance. A separate two-week sleep-restriction experiment discussed in our conversation produced approximately half a kilogram of weight gain.

Fatigue can also make food decisions harder. Eating may provide a temporary sense of energy or pleasure, while the effort required to deliberate over choices feels less appealing. Reward signaling, appetite hormones, mood, and tiredness can all contribute.

Being awake burns more energy, but usually not enough

It would be easy to assume that short sleep promotes weight gain entirely by lowering calorie expenditure. The laboratory results are more nuanced.

In a small study of women using a metabolic chamber, St-Onge’s group measured oxygen consumption and carbon dioxide production to estimate energy expenditure. Total expenditure increased by about 5%, or approximately 90 calories, during sleep restriction.

Why? Remaining awake costs more energy than sleeping.

But that increase was much smaller than the roughly 300 additional calories consumed in the earlier food-intake study. Although these were separate experiments, the comparison helps explain how more waking time can still favor positive energy balance.

Outside the laboratory, fatigue may also reduce spontaneous movement and increase sedentary behavior. A metabolic chamber cannot fully capture changes in walking, standing, fidgeting, commuting, or exercise because the available space is so limited.

Use the information without turning it into a judgment

After a poor night, it can help to pause before an automatic food choice and ask whether tiredness is influencing the decision.

That does not mean ignoring genuine hunger or deciding that dessert is forbidden. It means recognizing that the intensity of a craving may partly reflect sleep loss. You can then make a more informed decision rather than treating every urge as an accurate signal of what your body needs.

Sleep, Blood Sugar, Cortisol, and Cardiometabolic Health

One surprising result from the five-night laboratory study was what did not change. With food intake tightly controlled, the researchers did not detect differences in cortisol, glucose, insulin, or the lipid profile between sleep conditions.

That does not establish that severe sleep restriction is metabolically harmless. It shows that outcomes depend on the duration, setting, participants, and measurements of a study.

In the laboratory, participants were supervised and did not have to manage their usual work, family, and daily demands. Their food choices were also constrained. Real life includes many interacting factors that a controlled experiment deliberately removes.

Modest sleep restriction over six weeks produced different results

To examine a more realistic pattern, St-Onge’s group recruited people who ordinarily slept well and verified their sleep with actigraphy. Participants either maintained their usual schedule or delayed bedtime by an hour and a half while maintaining their wake time.

This reduced sleep from roughly seven and a half hours to about six hours per night for six weeks.

Under those conditions, the researchers observed:

• Increased insulin resistance and reduced insulin sensitivity.
• A greater adverse effect on insulin sensitivity in postmenopausal than premenopausal women.
• Increased blood pressure.

A sustained, moderate sleep deficit can matter even when it does not resemble an all-nighter. Six hours may feel manageable, but functioning through the day is not the same as avoiding physiological consequences.

How Diet Quality Influences Sleep

The relationship also runs in the other direction. Rather than asking only whether poor sleep changes eating, St-Onge began asking whether eating patterns predict later sleep health.

Using data from the Multi-Ethnic Study of Atherosclerosis, her group found that closer adherence to a Mediterranean-style diet was associated with a greater likelihood of adequate sleep and fewer insomnia symptoms.

A later analysis from the Women’s Health Initiative examined insomnia over three years. Importantly, it accounted for the fact that insomnia can develop, persist, or resolve. Women whose diets more closely resembled Mediterranean or DASH patterns were less likely to fall into the persistent or newly developing insomnia group.

What Mediterranean and DASH patterns have in common

These patterns emphasize foods such as fruits, vegetables, nuts, seeds, and other plant foods. Mediterranean-style eating also commonly includes olive oil and fish. DASH, short for Dietary Approaches to Stop Hypertension, includes low-fat dairy and was developed to help lower blood pressure.

The National Heart, Lung, and Blood Institute’s DASH guide provides background on that dietary pattern.

These are observational sleep findings. Researchers adjust for factors such as physical activity, depression, illness, and socioeconomic circumstances, but they cannot account perfectly for every difference between people. Social interactions and other behaviors may contribute.

Still, the consistency of the findings makes overall diet quality a compelling place to focus, especially because these patterns were already developed or studied for benefits beyond sleep.

Fiber, Saturated Fat, and Sugar Affect Different Aspects of Sleep

To examine diet and sleep more closely, St-Onge’s group returned to the adequate-sleep portion of its inpatient experiment. Participants had nine hours available in bed, and their sleep was measured each night using polysomnography.

The researchers compared nights following the controlled diet with a night following self-selected food intake.

When choosing their own foods, participants consumed almost 450 more calories and approximately 33% more saturated fat. Their total sleep duration did not differ, but their sleep changed in other ways:

• They took more than 70% longer to fall asleep.
• They obtained roughly 20% less slow-wave, or deep, sleep.

Looking at specific dietary components revealed further associations:

• More fiber was associated with more deep sleep.
• More saturated fat was associated with less deep sleep.
• More refined carbohydrates and simple sugars were associated with more arousals.

An arousal does not necessarily mean fully waking up. It can mean shifting from a deeper to a lighter sleep stage without remembering it the next morning. You can therefore spend the same number of hours asleep while experiencing a different quality of sleep.

There is an important limitation: meal timing was not specifically analyzed in that comparison. The controlled diet had fixed meal times, while self-selected eating could have differed in timing as well as composition. The results should not be interpreted as isolating every nutrient’s causal effect.

Meal Timing: Move Food Earlier Rather Than Simply Adding Breakfast

St-Onge personally prefers to finish her last meal at least three hours before bed. That is a useful starting point, not a universal threshold established for every person.

Individual tolerance varies. Some people feel little disruption from a later meal; others feel hot or uncomfortable and have difficulty settling into sleep. Food has a thermic effect, meaning that processing it increases energy expenditure and heat production.

The broader metabolic evidence also favors earlier eating.

The same food can be handled differently at different times

In a controlled metabolic-chamber experiment, participants ate identical foods in identical amounts, with identical intervals between meals. What changed was when the eating window began:

• Earlier condition: Eating began one hour after waking and continued within a 10-hour window.
• Later condition: Eating began five hours after waking and continued within a 10-hour window.

The later schedule produced lower fat oxidation, particularly following the later meals. That means participants burned less fat during those measurement periods. It does not, by itself, establish a particular amount of long-term fat gain.

Research discussed from Spain similarly found that people eating their main lunch earlier had better weight-loss outcomes than those eating it later.

The practical direction is to place more food within approximately the first two-thirds of the waking day and avoid concentrating intake in a large, late dinner.

Redistribute meals instead of increasing total intake

I raised a very practical problem: trying to eat breakfast can simply add a meal if lunch and dinner remain unchanged.

The aim is redistribution, not addition. Depending on your schedule, that might mean breakfast and an earlier dinner with something smaller between them, or lunch and an earlier dinner rather than a substantial meal near bedtime.

Protein needs also do not automatically require another late meal. Our discussion challenged the idea that only 30 grams of protein can be assimilated at a sitting. There is more flexibility in meal size and protein distribution than that rule suggests.

Sleep Health Is More Than an Hour Count

Duration matters, but a complete assessment also includes timing, regularity, quality, satisfaction, and daytime alertness.

St-Onge helped develop an American Heart Association scientific statement on multidimensional sleep health. One recommendation was that clinicians begin with an open-ended question: How is your sleep?

Asking only how many hours someone sleeps can miss difficulty falling asleep, repeated awakenings, snoring, poor morning refreshment, or persistent daytime sleepiness.

Circadian alignment and shift work

I described feeling better after an earlier bedtime than after a later one, even when the later schedule allowed more sleep. That does not prove the familiar claim that each hour before midnight counts double.

A more plausible explanation is circadian alignment. If your usual bedtime is around 10 p.m., shifting to midnight can put sleep out of step with your internal timing.

Shift workers face a more pronounced version of this challenge. They may attempt to sleep when their circadian system promotes wakefulness, while also contending with daylight, noise, and household activity.

Naps: timing and the reason for sleepiness both matter

A nap can reduce sleep pressure, which is helpful when you need rest but potentially disruptive when bedtime is approaching.

St-Onge described a cautious approach: keep naps short, around 30 minutes, avoid extending them beyond an hour, and place them early enough to rebuild sleep pressure before nighttime.

More importantly, consider why you need the nap. Sleepiness after an unusually short night is different from persistent sleepiness despite adequate opportunity to sleep. The latter deserves investigation rather than simply becoming a daily workaround.

Sex differences and recovery

Women tend to sleep slightly longer than men across adulthood while also reporting more difficulty initiating and maintaining sleep. Hormonal changes, menstrual-cycle symptoms, and differing social responsibilities may all contribute.

Women may also be more sensitive to some cardiovascular and metabolic effects of poor sleep. These findings argue against assuming that the same sleep disturbance has identical consequences for everyone.

An observational study discussed in our conversation linked the most favorable organ-aging measures with sleep durations roughly between six and a half and eight hours, with variation by sex and organ. That is not an individualized prescription. Feeling refreshed and remaining alert still matter.

Recovery also includes downtime. St-Onge described adding yoga when her work, parenting, and running routine began to feel relentlessly fast-paced. The useful principle is not that everyone needs yoga, but that constant activity and genuine restoration are different things.

Snoring, Sleep Apnea, and When to Get Tested

Nutrition changes cannot substitute for identifying a sleep disorder.

If someone reports that you snore, or you regularly wake unrefreshed and struggle to stay alert during the day, discuss those symptoms with a clinician. Snoring can be a clue to obstructive sleep apnea, in which the upper airway repeatedly becomes obstructed during sleep.

A nasal strip may reduce nasal resistance or snoring, but quieter breathing does not establish that an obstruction farther down the airway has been addressed.

Testing can involve overnight polysomnography or, when appropriate, a prescribed home sleep test. The NHLBI’s sleep apnea diagnosis resource explains these evaluation pathways.

CPAP treatment requires appropriate settings and guidance, not simply purchasing a device and guessing the pressure. Weight loss may help when excess weight contributes, and selected patients may have surgical or implantable treatment options.

The point is to identify the problem and match treatment to it, rather than assuming more time in bed will solve persistently unrefreshing sleep.

Functional Foods: Interesting Findings, Not Miracle Solutions

Before focusing on sleep, St-Onge studied functional foods: foods or ingredients investigated for benefits beyond their basic nutritional roles. These studies are useful partly because their results resist simple marketing claims.

Kefir: a null cholesterol result has a specific meaning

In her master’s research, men with mildly elevated cholesterol consumed approximately two cups, or 500 milliliters, of kefir daily for a month, compared with regular milk in another phase.

The study did not find an effect on cholesterol synthesis.

That does not establish that kefir has no health benefits. It means that this dose, comparison, population, and measured outcome did not produce the proposed effect. The experiment did not answer every question about glucose regulation, gut inflammation, or other possible outcomes.

St-Onge remains supportive of fermented foods within a varied diet. The distinction is between including a food for its overall nutritional value and promising a specific effect that a study did not demonstrate.

Coffee mannooligosaccharides: not ordinary coffee

An industry-funded study examined mannooligosaccharides extracted from spent coffee grounds in a coffee-like beverage during a weight-loss intervention.

The investigators found improved body-composition outcomes in men, but not women. The product did not proceed, according to St-Onge’s account.

This was a specialized extract, not a finding that regular brewed coffee produces the same effect. Its current availability was also unclear. It is an interesting research result, not a reason to consume coffee grounds.

Ginger and the thermic effect of food

In another crossover experiment, participants consumed ginger powder dissolved in warm water or hot water alone. Researchers then measured energy expenditure over several hours using a metabolic hood.

Ginger increased the thermic effect of food. St-Onge suggested that signaling through a receptor also responsive to capsaicin could help explain the effect.

The study tested an acute response. It does not establish that drinking ginger water produces substantial long-term weight loss. Its value is in showing that an ordinary food ingredient can have a measurable physiological effect.

Fiber and fermented foods require attention to tolerance

Our discussion also considered research comparing higher-fiber and fermented-food diets, including differences in inflammatory responses. The important point is that people do not necessarily respond identically to a broad category such as “fiber.”

Type, amount, and adaptation matter. Moving abruptly from very little fiber to a much higher intake can be uncomfortable. Likewise, several daily servings of fermented foods may be difficult for someone unaccustomed to them.

We also discussed personal experiences involving food-related sleepiness, suspected histamine responses, and digestive enzymes. Those anecdotes raise questions, but they do not establish a general explanation or justify a routine enzyme recommendation.

MCT Oil: A Modest Effect That Depends on Substitution

Medium-chain triglycerides, or MCTs, differ from the longer-chain fats that dominate most diets. St-Onge’s research used purified oils containing mainly eight-carbon and ten-carbon fatty acids.

These fats travel more directly to the liver and are more readily metabolized than many longer-chain fats.

In separate studies of men and women, meals containing MCTs increased the thermic effect of food. The measured difference was modest, approximately 45 to 60 calories over the post-meal measurement period, not a 45% to 60% increase in daily metabolism.

Some interventions also found improvements in body composition. A later weight-loss study comparing purified MCT oil with olive oil found greater weight loss with MCT oil.

The essential qualification is replacement, not addition. The practical amount discussed was about one to two tablespoons daily in place of another oil. Adding that oil on top of an unchanged diet adds energy and changes the equation.

Gastrointestinal effects also matter. Some participants initially experienced stomach rumbling and laxative-type symptoms at the study doses, although these resolved in the reported experiment.

Could MCTs and ginger have additive effects? Possibly, because their proposed mechanisms differ. But that combination has not been established experimentally, and the individual results should not be added together as a guaranteed calorie-burning strategy.

Build a Dietary Pattern, Not a Collection of Hacks

The portfolio diet illustrates a broader strategy: combine foods with complementary evidence rather than expecting one ingredient to solve everything.

Developed by David Jenkins for cholesterol reduction, the original pattern emphasized:

• Soy protein.
• Nuts.
• Plant sterols.
• Soluble fiber.

It has since become more flexible, incorporating other legumes and monounsaturated fats such as olive oil. In a controlled comparison discussed by St-Onge, the original dietary portfolio achieved cholesterol reductions comparable to the statin used in that trial. That does not mean diet universally replaces medication.

Satiety and heart health do not have to compete

I raised the concern that people need to feel satisfied, not merely receive instructions to improve their blood lipids.

St-Onge’s answer was to avoid framing the choice as plants versus animal foods. Water-rich plant foods can provide substantial volume without excessive calories, while nuts contribute protein and fats that can prolong fullness.

Animal foods can also fit. The emphasis is on portions and balance rather than allowing one category to crowd out everything else.

Combinations of refined starch, sugar, and fat can be especially easy to overeat. A dietary pattern built around minimally processed foods can address both nutritional quality and the practical difficulty of stopping once eating begins.

Portion size and formulation matter

St-Onge described being struck by restaurant portion sizes after moving from Canada to the United States. She also noticed that familiar yogurts tasted sweeter, illustrating how similar products can be formulated differently across countries.

The useful lesson is to compare actual products rather than relying on category names. Yogurt, bread, or a plant-based snack can vary substantially in ingredients, added sugar, fiber, and serving size.

Choosing to skip dessert, eat earlier, or decline alcohol should not automatically be treated as evidence of unhealthy restriction. At the same time, thoughtful food choices and rigid, distressing food rules are not the same thing. Context matters.

Seed Oils, Corn Chips, and the Importance of the Comparison

One of the most counterintuitive studies we discussed involved snack chips fried in corn oil.

In a Frito-Lay-funded crossover study, participants completed three approximately 25-day snack conditions. The researchers compared corn-oil-fried chips with low-fat, high-carbohydrate snacks and with higher-fat snacks containing a different fatty-acid profile.

The corn-oil chip condition produced a more favorable lipid profile, including lower lipoprotein(a), than the comparison conditions.

That result does not mean chips are an ideal health food. It means those chips performed better than those specific alternatives on the measured outcomes.

This is central to interpreting nutrition research: better than what?

Separate the oil from the entire food

Studies replacing saturated fats with unsaturated vegetable oils often find improvements in cardiometabolic risk markers. That question is distinct from whether a highly processed food containing those oils is a good overall dietary choice.

I generally prefer olive oil and use some butter. St-Onge does not categorically avoid seed oils and favors oils that remain liquid at room temperature.

Oil selection also depends on use. Flavor, refinement, smoke point, and cooking temperature matter. Flaxseed oil, for example, is not suited to high-temperature cooking. The practical principle is to match the specific oil to the cooking method rather than assuming one oil is ideal for every purpose.

Read labels with your own priorities in mind

Nutrition-label literacy is more useful than sorting every packaged food into “good” or “bad.” Compare similar products and focus on the factors relevant to your health.

For someone with salt-sensitive blood pressure, sodium may deserve particular attention. A highly active person replacing substantial sweat losses may have different priorities. Trying to optimize every number at once can become overwhelming.

How to Evaluate Industry-Funded Nutrition Research

Industry funding deserves scrutiny, but the funding source alone does not tell you whether a result is valid.

St-Onge described industry-funded studies in which she did not feel pressured to obtain a favorable result. Her publication rights were protected contractually, and some projects produced null findings.

The harder problem in some cases was getting journals to publish those null findings. One manuscript was rejected repeatedly despite the sponsor allowing submission.

This creates publication bias: positive results may be easier to find in the literature than studies showing no detectable effect. That problem is not unique to industry-funded research.

A useful appraisal asks:

• Was the research question clearly defined?
• Was the comparison appropriate?
• Were the design and measurements suited to the question?
• Were funding and financial relationships disclosed?
• Could the investigators publish regardless of the outcome?
• Does the conclusion stay within what the data establish?

Government funding does not eliminate every incentive or source of bias, either. Transparency, replication, honest analysis, and publication of null findings all matter.

So does statistical literacy. A numerical difference is not automatically a meaningful or statistically reliable effect. Good research training includes teaching investigators not to force a conclusion simply because one average is slightly larger than another.

A Practical Framework for Better Sleep and Metabolic Health

The strongest message is not that everyone needs MCT oil, ginger drinks, or a specialized dietary portfolio. It is that ordinary choices can reinforce one another.

1. Protect sufficient sleep opportunity. A repeated reduction of an hour or two can influence appetite and metabolic health.
2. Evaluate sleep quality as well as duration. Consider regularity, morning refreshment, daytime alertness, and possible breathing problems.
3. Shift food earlier where practical. Redistribute existing intake rather than automatically adding breakfast or another meal.
4. Build meals around a high-quality dietary pattern. Mediterranean and DASH-style approaches offer useful foundations.
5. Include fiber-rich whole foods and adapt gradually. Pay attention to tolerance rather than forcing a sudden large increase.
6. Be deliberate about late meals, refined sugars, and saturated fat. These may affect aspects of sleep that total hours alone do not reveal.
7. Treat specialized foods and supplements as secondary. An interesting physiological effect is not the same as a large, durable health benefit.

St-Onge prefers obtaining nutrients through whole foods when possible, while recognizing that some people need supplements. That distinction matters because fruits, vegetables, and other whole foods provide more than isolated fiber or vitamins. They also contain polyphenols and other compounds whose combined effects remain incompletely understood.

Further information about her work is available through her Columbia University academic profile.

The opportunity is to turn a vicious cycle into a helpful one: better sleep supports more manageable hunger and food choices; better food choices and timing support better sleep. You do not have to change everything at once to begin moving that cycle in the right direction.