Does Lack of Sleep Add Visceral Fat? What One Study Found

What did the study find?

Rhonda Patrick described a small two-week study in healthy young men in which 4-hour nights raised visceral fat, with little change on the scale.

The study Rhonda Patrick described was small, so treat it as a sign, not a rule.

A tape can't see visceral fat. Two people with the same waist can carry very different amounts inside. Only a scan, like an MRI or DEXA, measures it. Midline can't measure it.

Does short sleep affect appetite and weight too?

Matthew Walker says that when sleep runs short, appetite chemicals rise and the waistline tends to expand. If you diet while underslept, he says more of the weight you lose comes from muscle.

How much sleep do the experts suggest?

Sleep at least 7 hours, with a fixed wake time.

Matthew Walker gives seven to nine hours as the range, with seven as the minimum, and says to go to bed and wake at the same time every day, weekends too.

Michael Breus says his number one sleep tip is to wake up at the same time seven days a week. Pradeep Jamnadas also puts the minimum at seven hours a night.

What gets in the way of sleep?

• Alcohol. Matthew Walker lists it among the things people take in that harm sleep, even though they think it helps. Michael Breus says to stop alcohol, like food, about three hours before bed.
• Stress. Matthew Walker says stress and anxiety are among the things that stop you sleeping well. Michael Breus puts most poor sleep down to anxiety or fear, by his own estimate.
• Screens. Andrew Huberman says no screens in the last 30 minutes before sleep, and to dim your phone. Matthew Walker goes further: an hour before bed, avoid social media, email and texts.

Caffeine has its own page: best time to have caffeine. More on sleep: does alcohol help you sleep, how long before bed to turn off screens and how many hours of sleep you need.

What if you still wake up tired?

If you still wake up tired after fixing your sleep habits, ask your doctor about a sleep apnea test. Many cases go undiagnosed.

If poor sleep has gone on for months or affects your days, see your doctor.

Where does sleep sit among the other habits?

Food, movement, sleep, alcohol and stress all affect visceral fat. Start small and add one change at a time.

Rhonda Patrick names exercise, sleep and diet as the main levers for visceral fat, plus avoiding too much alcohol, and says stress amplifies it.

See every habit on the visceral fat guide.

Midline's Level 4, Sleep and Stress, has habits for sleeping at least 7 hours and an early last caffeine. It can't measure visceral fat.