People who fail to get enough sleep are at higher risk for putting on unhealthy belly fat. In a new study published in the Journal of the American College of Cardiology, researchers at the Mayo Clinic studied 12 healthy, non-obese young adults. Each participant slept nine hours for the first four days. Then half were only allowed to sleep four hours each night for the next two weeks, while the rest slept the normal nine hours. All participants could eat as much as they liked throughout the study. The researchers found that the people who got less sleep ate about 300 more calories each day. They also showed increases in belly fat and visceral fat. This research is particularly important, as roughly one-third of adults do not get enough sleep.