A fascinating new study published in Nature analyzed nearly 500,000 adults and compared their sleep habits with sophisticated measures of biological aging. Instead of simply looking at birthdays, researchers measured how quickly different organs throughout the body were actually aging using MRI scans, blood proteins, and metabolic markers. Their findings revealed something surprising. The people whose bodies appeared to age the slowest consistently slept between about 6.4 and

How the Lack of Sleep May Be Holding You Back from Your Health, Fitness, and Nutrition Goals