In good news for couch potatoes here comes a protein that can help them cut flab without high-intensity gym or even a brisk walk around the park. The catch is: It is not yet available as pills but occurs naturally in the body. Called 'Sestrin' the protein might harness the benefits of a good workout without ever moving a muscle say researchers from University of Michigan. While studying a class of naturally-occurring protein called Sestrin they found that it can mimic many of exercise's effects in flies and mice. The findings could eventually help scientists combat muscle wasting due to