Eating for Better Sleep & Foods that Improve Metabolic Health | Dr. Marie-Pierre St-Onge
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Summary
Takeaways
- ❖Even modest sleep deprivation (4-5 hours/night) leads to an average increase of 300-450 calories consumed daily.
- ❖Sleep deprivation increases ghrelin (hunger hormone) in men and decreases GLP-1 (satiety hormone) in women.
- ❖Insufficient sleep upregulates reward centers in the brain, increasing the appeal of palatable foods.
- ❖Higher fiber intake is associated with more deep sleep; higher saturated fat intake is linked to less deep sleep.
- ❖More refined carbohydrates and simple sugars lead to increased sleep arousals and less deep/REM sleep.
- ❖Eating your last meal at least 3 hours before bedtime is generally beneficial for sleep quality.
- ❖Shifting the majority of your caloric intake to the first two-thirds of your waking day improves fat oxidation and metabolic health.
- ❖Ginger consumption can slightly increase the thermic effect of food, potentially aiding in modest energy expenditure.
- ❖Substituting standard fats with medium-chain triglycerides (MCTs) can lead to a small but significant increase in calorie burning and improved body composition over time.
- ❖Women tend to sleep slightly longer than men but report more sleep difficulties and are more sensitive to the metabolic impacts of poor sleep.
Insights
1Sleep Deprivation Drives Overeating with Sex-Specific Hormonal Responses
Even mild sleep restriction (e.g., 4-5 hours per night for 5 nights) causes individuals to consume an average of 300-450 extra calories per day when allowed to self-select food. This effect is mediated by distinct hormonal changes: men experience elevated ghrelin (a hunger-stimulating hormone), while women show reduced GLP-1 (a satiety-promoting peptide). Additionally, sleep deprivation activates reward centers in the brain, making high-calorie, palatable foods more desirable.
Dr. St-Onge's lab study found that participants ate 300 calories more in a short sleep condition. In men, ghrelin increased, and in women, GLP-1 decreased. Neuroimaging showed upregulation in reward centers of the brain during sleep restriction.
2Dietary Composition Directly Impacts Sleep Quality
Specific macronutrient intake significantly influences sleep architecture. Higher fiber intake is positively correlated with more deep, slow-wave sleep. Conversely, increased consumption of saturated fats leads to less deep sleep, and diets high in refined carbohydrates and simple sugars result in more sleep arousals, disrupting the continuity of deep and REM sleep.
In an inpatient study where participants self-selected their diet, higher fiber intake was associated with more deep sleep, higher saturated fat with less deep sleep, and more refined carbohydrates with increased arousals.
3Meal Timing Optimizes Metabolic Health and Sleep
Consuming the majority of daily calories earlier in the day, within the first two-thirds of the waking period, is more beneficial for metabolic health, including fat oxidation and insulin sensitivity. Eating too close to bedtime can prolong the time it takes to fall asleep and reduce deep sleep stages, partly due to the thermic effect of food and misalignment with circadian rhythms.
A study in a metabolic chamber showed that eating later in the day reduced fat oxidation. Dr. St-Onge personally aims to finish her last meal 3 hours before bed. Research in Spain also indicates that individuals who eat their largest meal (lunch) earlier in the day achieve better weight loss outcomes.
4Mild Chronic Sleep Restriction Leads to Significant Cardiometabolic Dysfunction
While acute, severe sleep restriction (e.g., 4 hours for 5 nights) may not immediately alter glucose or cortisol levels when diet is controlled, sustained, mild sleep restriction (e.g., 6 hours for 6 weeks) in a free-living environment significantly increases insulin resistance and blood pressure. This suggests that the metabolic harm of insufficient sleep is compounded by associated poor food choices and lifestyle changes.
An initial study with 4 hours of sleep for 5 nights showed no change in glucose or cortisol when food was controlled. However, a follow-up study with 6 weeks of 6 hours of sleep in a free-living setting showed increased insulin resistance and blood pressure, particularly in postmenopausal women.
Bottom Line
Coffee mannan oligosaccharides, extracted from spent coffee grounds, led to greater adipose fat loss in overweight men in an industry-sponsored study, but the product was not commercialized because it showed no effect in women.
This highlights a potentially effective, sex-specific dietary supplement for fat loss that never reached the market due to commercial viability concerns, despite positive results in a significant demographic.
Further research into sex-specific nutritional interventions and market strategies that cater to gender-specific benefits could unlock valuable health products.
Snack chips fried in corn oil (high in polyunsaturated fats) alleviated cardiovascular risk factors (e.g., better lipid profile, less lipoprotein little A) when substituted for low-fat/high-carb or high-fat/high-saturated snacks.
This counter-intuitive finding challenges the blanket demonization of 'junk food' and 'seed oils,' suggesting that the specific fat composition, even in processed snacks, can have a measurable positive impact on certain health markers compared to other common snack choices.
This opens avenues for reformulating processed foods with specific oil types to improve health outcomes, and for more nuanced public health messaging about dietary fats beyond simple 'good' or 'bad' labels.
Opportunities
Develop and market sex-specific nutritional supplements or dietary plans based on hormonal responses to sleep deprivation.
Given that men experience increased ghrelin and women reduced GLP-1 from sleep loss, tailored supplements (e.g., ghrelin suppressors for men, GLP-1 enhancers for women) or meal plans could be highly effective. The uncommercialized coffee mannan oligosaccharides for men's fat loss is a direct example of a missed opportunity.
Create a 'Sleep-Optimizing Meal Service' that provides high-fiber, low-saturated fat, low-refined carb meals with early dinner timings.
This service would cater to individuals looking to improve their sleep quality through diet, offering pre-prepared meals that align with research-backed recommendations for better sleep architecture and metabolic health.
Lessons
- Aim for 7-8 hours of sleep per night to regulate hunger hormones and prevent overeating; be aware of sex-specific hormonal changes (ghrelin in men, GLP-1 in women).
- Increase dietary fiber intake (e.g., fruits, vegetables, whole grains) to promote more deep, slow-wave sleep.
- Reduce intake of saturated fats and refined carbohydrates/simple sugars, especially in the evening, to improve sleep quality and reduce nighttime arousals.
- Shift your eating window earlier in the day, aiming to consume the majority of your calories within the first two-thirds of your waking hours, and finish your last meal at least 3 hours before bedtime.
- Consider incorporating functional foods like ginger (e.g., ginger tea) or medium-chain triglycerides (MCTs) in place of other fats to potentially boost energy expenditure, especially if aiming for weight management.
- If experiencing persistent daytime sleepiness or snoring, consult a doctor for sleep apnea testing, as it significantly impacts metabolic health and can be treated.
Quotes
"Higher intakes of fiber were associated with more deep sleep, higher intakes of saturated fat, less deep sleep, and then more refined carbohydrates, simple sugars, more arousals."
"In men specifically, uh we saw an increase in ghrelin in response to the short sleep. So this hormone that triggers food intake. In women, we saw a reduction in GLP-1... So the satiety hormone was reduced as a result of short sleep in women."
"When you don't sleep enough at night, you have both physiological signals to eat more for men or not stop eating in women that lead to greater food intake that's also could be impacted by just pleasurable centers that are activated to a greater extent as a result of insufficient sleep."
"The sweet spot really was 6 and 1/2 to about 7 and 1/2 8 hours for optimal aging."
"If you're not an honest scientist, obviously, I don't think it matters who's sponsoring your research because the NIH finds misconduct."
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