Sleep deprivation and obesity always go hand in hand. Regular sleep deprivation disrupts the production of ghrelin and leptin, hormones responsible for feelings of hunger and satiety.

After a single sleepless night, people eat more than usual and are more likely to choose high-calorie foods.

In a 2004 study, researchers found that in healthy young people, just two days of sleep deprivation increased appetite by 24% and cravings for sweet and fatty foods by 33-45%.