Many studies agree that if your sleep is of short duration, you increase your chances of becoming obese. Researchers have found that sleep deprivation impacts on 2 hormones related to appetite, one is ghrelin which is produced in the stomach and triggers appetite, the other hormone known as leptin is produced by fat cells. When leptin levels are low it signals a need for more calories to be consumed.
Researchers have found that people who sleep for five or less hours on a regular basis have higher ghrelin levels and lower leptin levels, than those who sleep for eight or more hours. Researchers noted that the combination of increased ghrelin , which increased appetite, and the easy access to food in some societies accounted for increased obesity.
Maybe by simply increasing the waking hours, exposure to food is increased, more time for snacking, and those who sleep longer hours have decreased opportunity to snack.
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