she was NOT me

The sleep-diet connection is regular fodder for diet books and magazine articles. Maybe you have even heard about the sleep diet, which suggests you can lose weight while you catch your ZZZs.

And it’s true, sort of.

“It’s not so much that if you sleep, you will lose weight, but if you are sleep-deprived, meaning that you are not getting enough minutes of sleep or good quality sleep, your metabolism will not function properly,” explains Michael Breus, PhD, author of Beauty Sleepand the clinical director of the sleep division for Arrowhead Health in Glendale, Ariz.

On average, we need about 7.5 hours of quality sleep per night, he says. “If you are getting this already, another half hour will not help you lose 10 pounds, but if you are a five-hour sleeper and start to sleep for seven hours a night, you will start dropping weight.”

Exactly how lack of sleep affects our ability to lose weight has a lot to do with our nightly hormones, explains Breus.

The two hormones that are key in this process are ghrelin and leptin. “Ghrelin is the ‘go’ hormone that tells you when to eat, and when you are sleep-deprived, you have more ghrelin,” Breus says. “Leptin is the hormone that tells you to stop eating, and when you are sleep deprived, you have less leptin.”

 More ghrelin plus less leptin equals weight gain.

“You are eating more, plus your metabolism is slower when you are sleep-deprived,” Breus says.