RCTHumann = 182021
Severe sleep restriction suppresses appetite independent of effects on appetite regulating hormones in healthy young men without obesity.
Plain-language summary
This study set out to see how severe sleep restriction affects appetite, food intake, and appetite-regulating hormones in healthy young men. It compared three nights of very little sleep (2 hours) to adequate sleep (7-9 hours) in 18 men, measuring hunger, fullness, hormone levels, and how much they ate at a buffet lunch. Contrary to what happens with moderate sleep loss, severe restriction lowered hunger and food intake without changing food preferences or most appetite hormones. The findings suggest that extreme sleep loss might suppress appetite through a different mechanism than moderate sleep deprivation.
Key findings
- Severe sleep restriction (2 hours/night for 3 nights) reduced hunger and food intake at a single meal.
- It did not change food preferences or most appetite-regulating hormones.
- Post-meal fullness was higher after sleep restriction.
- Peptide YY (PYY) and GLP-1 (gut hormones that signal fullness) were slightly lower after sleep restriction.
How to analyze the study yourself
- Study type
- Randomized trials assign people to groups by chance, so differences between groups are unlikely to come from who chose what, but the small sample and short duration limit how far the findings can be generalized.
- Population
- Healthy young men without obesity
- Funding
- Research Support, U.S. Gov't, Non-P.H.S.
- Takeaway
- This study found that severe sleep loss (just 2 hours a night) lowered hunger and food intake at the next meal, unlike moderate sleep deprivation which usually increases appetite. If you are cutting sleep very short, be aware that your hunger signals might not reflect your actual energy needs.