The answer is exercise. Just 30 minutes per day can have enormous benefits on a wide variety of health conditions. In this YouTube video, Dr. Mike Evans, an American physician uses a whiteboard and marker in a fun way to go through the scientific literature to come up with the answer. He has expanded his repertoire at Reframe Health Lab to make health messages easy to understand as well as being science-based.
I love this video. Time: 5 minutes