Exercise may create healthier fat. A new study, which was published last month in the Journal of Applied Physiology, found that just a single session of exercise may change the molecular workings of fat tissue in ways that, over time, could improve metabolic health. Researchers gathered men and women who were overweight but did not have insulin resistance, then tested their body compositions and took fat samples. The researchers then had each volunteer exercise on a treadmill or stationary bike for an hour at a moderately tiring pace, and an hour later, repeated the fat biopsies. In almost all of the volunteers, the fat tissue after exercise showed greater amounts of a protein that is known to contribute to the development of more blood vessels. More blood vessels in tissue leaders to greater blood flow, which is great for metabolic health. While the changes were not enormous, they were shown to occur consistently and after a single session of exercise. With continued exercise, one could expect to improve fat health over time