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Do you have trouble sleeping? If you鈥檙e carrying extra pounds, especially around your belly, losing weight and some of that muffin top may help you get better ZZZs. So say researchers from Johns Hopkins University School of Medicine, who presented their findings at this year鈥檚 annual meeting of the American Heart Association.

The Hopkins researchers recruited 77 overweight volunteers with either prediabetes or type 2 diabetes. Many reported sleep problems such as sleep apnea, daytime fatigue, insomnia, and restless or interrupted sleep. Half of the volunteers went on a weight-loss diet with supervised exercise training. The other half did just the diet. After six months, participants in both groups had lost an average of 15 pounds and reduced their belly fat by 15%. Sleep quality improved in both groups. A reduction in belly fat was the best predictor of improved sleep.

The results of this trial are in line with other studies exploring how weight affects sleep and sleep affects weight.

Linking weight loss, belly fat, and sleep

Excess weight and body fat increase the likelihood of developing obstructive sleep apnea. This condition occurs when the airway becomes blocked, either completely or partially, during sleep. These temporary blockages causes frequent awakenings which, in turn, increase the risk for conditions such as high blood pressure, stroke, and heart disease.

鈥淪o one possibility with the results of this study is that weight loss reduced sleep apnea and improved sleep quality,鈥� says sleep expert Dr. Lawrence Epstein, an instructor in medicine at Harvard Medical School. Weight loss also improves blood sugar control which, in people with diabetes or prediabetes, could reduce restless legs syndrome and periodic limb movement disorders, two sleep disorders that people with diabetes are prone to having.

Exercise has also been shown to improve sleep quality. For example, Oregon State University researchers found that slept better and felt more alert during the day than those who didn鈥檛 exercise much. (Don鈥檛 exercise right before bedtime, however. That can make it difficult to fall asleep.)

Why reducing belly fat might be a key to improved sleep remains a mystery. We do know that fat deposited around the abdomen, called visceral fat, is associated with heart disease, diabetes, dementia, breast and colon cancers, and other chronic health conditions. Losing belly fat, then, seems like a logical way to improve not only sleep but also overall health. Unfortunately, it isn鈥檛 that simple.

鈥�Where you lose weight is partly determined by genetics,鈥� says Dr. I-Min Lee, professor of medicine at Harvard Medical School and an expert on physical activity鈥檚 role in promoting health and preventing chronic disease. 鈥淕enerally, if you lose weight, some of this will occur in belly fat. You just can鈥檛 predict how much.鈥�

Improving sleep

Despite what thousands of websites want you to believe, there are no exercises or potions that 鈥渕elt away鈥� belly fat. Instead, the solution is old-fashioned exercise and a healthy diet.

If you are serious about losing weight and sleeping better, aim for 150 minutes of moderate-intensity physical activity (like swimming or brisk walking) each week. You don鈥檛 have to do five 30-minute workouts. More but shorter exercise sessions, such as three 10-minute brisk walks instead of one 30-minute walk, will have the same impact, says Dr. Lee.

Exercise alone generally doesn鈥檛 lead to substantial weight loss. That requires cutting back on daily calories.

The lasting effects of combining exercise and weight loss will go far beyond improving your long winter鈥檚 nap and well into a healthy future.