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Weight loss · Plain answers

Short on sleep, big on cravings: how sleep affects hunger

A bad night makes the cookie jar louder. Here is why, and how better sleep can make healthy eating easier.

HealthStylz Editors
· 3 min read

Photo: https://kaboompics.com/

The short version

  • Too little sleep raises hunger and cravings.
  • Adults need at least 7 hours a night.
  • Longer sleep led to fewer calories eaten in one study.

Appetite Regulation

Evening Appetite & Craving Defense Profile

How balanced dinners and restful wind-down habits halt late-night kitchen raiding.

  1. Dinner Protein AnchorEvening satiety foundation 30g anchor
  2. Mindful Pause CheckStress vs hunger Mindful check
  3. Sleep Hormone LeptinFullness hormone protection High leptin
  4. Calming Herbal AlternativeEvening drink routine Herbal routine

Source: Cell Metabolism & Sleep Foundation.

Do you crave chips and sweets after a rough night? It is not just willpower. Sleep and hunger are closely linked. When you sleep too little, your body sends the wrong signals about food.

The hunger hormones

Harvard's Nutrition Source explains two hormones. Ghrelin tells you that you are hungry. Leptin tells you that you are full. When you do not get enough sleep, ghrelin goes up and leptin goes down. That means more hunger and less satisfaction after you eat.

Harvard also says that sleep-short adults tend to prefer foods high in carbs and fat. They snack more, especially late in the evening. Poor sleep can also wake up the reward centers in the brain that crave high-fat, high-calorie food.

What the research found

Harvard Health described a study in JAMA Internal Medicine. It followed 80 overweight adults, ages 21 to 40. They normally slept under 6.5 hours a night. One group got coaching to sleep longer, aiming for 8.5 hours. The other group kept their usual habits. Diet and exercise did not change.

The results after two weeks:

  • The longer-sleep group slept more than an hour extra each night.
  • They ate about 270 fewer calories a day.
  • They lost about a pound, while the other group gained just under a pound.

It was a short study. It did not show if the changes lasted, and it did not look at what people ate. Still, it shows that sleep can make eating easier.

Harvard's Nurses' Health Study also found that women who slept 5 hours or less a night had the highest BMI and the greatest weight gain. That kind of study shows a link, not proof.

How much sleep do you need?

The CDC says adults aged 18 to 60 need 7 or more hours a day. For ages 61 to 64, it says 7 to 9 hours. For ages 65 and older, it says 7 to 8 hours.

Easy ways to sleep better

The CDC and Harvard share these tips:

  • Go to bed and get up at the same time each day, even on weekends.
  • Keep your bedroom dark, quiet and cool.
  • Put screens away at least 30 minutes to an hour before bed.
  • Skip large meals and alcohol 2 to 3 hours before bed.
  • Avoid caffeine in the afternoon and evening.
  • Be active during the day, but avoid hard workouts within an hour of bed.
  • If you cannot fall back asleep, get up and do something quiet until you feel sleepy.

On a short-sleep day

Be kind to yourself. Eat a protein breakfast, keep fruit and nuts handy, and go to bed a little earlier tonight. Expect the cravings to be loud, and do not judge them.

One small thing to try

Pick a bedtime and set a phone alarm for 30 minutes before it. When it goes off, put the screen away and start winding down.

Talk to your doctor if you often cannot sleep, snore loudly or wake up tired. Those can be signs of a sleep problem that needs care.

Where this comes from