Summary of Eating for Better Sleep & Foods that Improve Metabolic Health | Dr. Marie-Pierre St-Onge

Overview of Eating for Better Sleep & Foods that Improve Metabolic Health | Dr. Marie-Pierre St-Onge

In this episode, Andrew Huberman speaks with Columbia nutrition researcher Dr. Marie-Pierre St-Onge about the two-way relationship between sleep and diet: how insufficient sleep changes hunger, food choice, and metabolism, and how what and when you eat can shape sleep quality, sleep stages, and cardiometabolic health. The discussion is highly practical, with specific findings on sleep duration, meal timing, food composition, appetite hormones, and sleep apnea.

Sleep Loss Increases Hunger and Overeating

Dr. St-Onge explains that even modest or chronic short sleep can shift appetite and reward pathways in ways that promote overeating.

Key findings from lab studies

• In a controlled sleep-restriction study, participants had a 4-hour time-in-bed opportunity for 5 nights versus a normal sleep condition.
• Under short sleep, participants ate about 300 extra calories when allowed to self-select food.
• Men: short sleep increased ghrelin (a hunger hormone).
• Women: short sleep reduced GLP-1 (a satiety hormone).
• Brain imaging showed greater reward-center activation in response to food during sleep restriction.

Bigger-picture takeaway

• A meta-analysis cited in the discussion found short sleep can lead to roughly 250–400 extra calories per day.
• Over time, that small daily surplus can translate into meaningful weight gain.

Sleep Restriction Can Disrupt Metabolic Health

The conversation distinguishes between tightly controlled lab studies and real-world sleep loss.

In tightly controlled conditions

When participants were kept on a fixed diet, short sleep did not initially change:

• cortisol
• glucose
• insulin

But with longer, milder sleep restriction in free-living conditions

A follow-up study found that 6 weeks of mild sleep restriction:

• increased insulin resistance
• reduced insulin sensitivity
• raised blood pressure
• had worse effects in postmenopausal women

Main interpretation

Sleep loss may not act alone. In daily life, its effects likely combine with:

• poorer food choices
• lower spontaneous activity
• stress
• circadian disruption

How Diet Affects Sleep Quality

Dr. St-Onge’s group also studied the reverse direction: how food influences sleep that same night.

Inpatient findings

When participants switched from a controlled diet to a self-selected diet:

• they ate about 450 more calories
• ate 33% more saturated fat
• took longer to fall asleep
• had shorter slow-wave sleep by about 20–23%

Nutrient patterns linked to sleep

That study found:

• More fiber → more deep sleep
• More saturated fat → less deep sleep
• More refined carbohydrates and simple sugars → more arousals

Important nuance

Arousals do not always mean waking fully; they often mean shifting from deeper to lighter sleep, which reduces restorative sleep quality.

Earlier Eating Appears Better for Sleep and Metabolism

Dr. St-Onge emphasizes that meal timing matters, not just calorie count.

Main points

• Eating earlier in the day tends to support better cardiometabolic health.
• A later eating window reduced fat oxidation in controlled studies.
• She personally prefers to finish eating at least 3 hours before bed.

Why timing may matter

Eating late can:

• raise body temperature
• interfere with the body’s cooling process before sleep
• worsen sleep onset and sleep depth

Diet Quality and Insomnia: Mediterranean and DASH Patterns

Using large cohort studies, the discussion connects higher-quality dietary patterns with better sleep.

Findings

• Diets closer to the Mediterranean diet were associated with:
  • better odds of adequate sleep
  • fewer insomnia symptoms
• Diets closer to the DASH diet were associated with:
  • less insomnia over time
  • better sleep outcomes in women

Broader point

Healthier dietary patterns may support sleep, but they also tend to correlate with other beneficial behaviors like more physical activity and better overall health.

Sleep Deprivation, Stress, and Exercise

The episode also explores whether sleep deprivation is simply a form of stress.

What the research showed

• In the sleep-restriction study, cortisol did not change
• Glucose and insulin also stayed stable in the fully controlled inpatient setting

Practical interpretation

Sleep loss may create a “sick” or depleted feeling without necessarily changing baseline cortisol immediately. In real life, the combination of:

• sleep loss
• daily stress
• food access
• poor meal timing likely drives worse metabolic outcomes.

Napping: Helpful, but Use Strategically

Dr. St-Onge says naps can be useful, but they should not interfere with nighttime sleep.

Guidance

• Keep naps short: about 30–60 minutes
• Nap earlier in the day
• Avoid napping too close to bedtime so you preserve sleep pressure

Key caution

If you need frequent naps despite adequate sleep opportunity, it may signal a sleep problem worth investigating.

Sleep Apnea: Common, Underdiagnosed, and Worth Testing

The conversation ends up on sleep apnea because of its major impact on sleep quality, daytime alertness, and long-term health.

Main points

• Many people don’t realize they have apnea until someone notices snoring or they monitor their sleep.
• Symptoms can include:
  • loud snoring
  • unrefreshing sleep
  • daytime sleepiness
• Diagnosis can be done with:
  • overnight polysomnography
  • home sleep testing

Treatment options

• Weight loss if excess weight is a factor
• CPAP
• In some cases, surgical or implant-based approaches

Foods and Functional Nutrition: What Her Studies Found

Dr. St-Onge discussed several “functional foods” she has studied over the years.

Kefir

• Studied for possible cholesterol benefits
• Result: no effect on cholesterol synthesis in that study

Ginger

• Dissolved ginger powder increased the thermic effect of food
• Likely acts through a heat-producing mechanism

Medium-chain triglycerides (MCTs)

• Increased thermic effect of food
• In follow-up studies, MCTs were associated with greater weight loss than olive oil in a controlled context

Coffee-derived manooligosaccharides

• Studied in a weight-loss beverage
• Showed effects in men, not women
• Not widely commercialized

Corn-oil-fried snack chips

• In a comparative study, chips fried in corn oil produced a better lipid profile than comparator snacks
• The episode uses this to illustrate how food formulation and fat type can matter

Industry-Funded Research and Null Results

A substantial portion of the discussion addresses how science is funded and why that matters.

Dr. St-Onge’s view

• Industry funding is not automatically a problem if:
  • researchers design the study
  • retain access to the data
  • control the analysis
  • are free to publish the results

Important caveat

• Null results are hard to publish
• That applies to industry and non-industry research alike
• The real issue is scientific integrity, not merely the source of funding

Core Takeaways

• Short sleep increases hunger and food reward, making overeating more likely.
• Sleep loss and poor diet reinforce each other in a vicious cycle.
• Fiber, earlier eating, and healthier dietary patterns tend to support better sleep.
• Saturated fat and refined carbs/sugars are more likely to disrupt sleep architecture.
• Meal timing matters: earlier is generally better for sleep and metabolism.
• Sleep apnea should be tested for, not ignored.
• The best approach is to create a virtuous cycle: better sleep → better food choices → better sleep.

Practical Actions Highlighted in the Episode

• Aim for consistent, sufficient sleep most nights.
• Notice whether hunger or cravings are really being driven by sleep loss.
• Try to eat earlier and finish your last meal 2–3+ hours before bed if possible.
• Emphasize:
  • fiber-rich foods
  • minimally processed meals
  • balanced dietary patterns like Mediterranean or DASH
• If you snore or wake unrefreshed, ask about sleep apnea testing.
• Use naps sparingly and keep them short and early.