Arnold Schwarzenegger, the former bodybuilder and actor, has credited sleep for helping with weight loss efforts in his latest newsletter. Harvard scientists have found that people who sleep for less than 5 hours per night weigh more than those who sleep more than 7 hours per night.

Additionally, those who slept less than 5 hours per night were found to be 32% more likely to experience major weight gain over a 16-year period and 15% more likely to become obese. Schwarzenegger suggests getting at least 6 hours of sleep per night, ideally 7.5 to 8.5 hours, to prevent major weight gain.