 That's what a new study is showing from the American Cancer Society. CBS chief medical correspondent Dr. John LaPook acknowledges that making these kind of lifestyle changes can be difficult for some. It's hard to do everything perfectly, and you shouldn't let perfect be the enemy of the good. You do the best thing you can. You try to exercise. You lean towards a healthy diet, plants whenever you can, and you try to stay active. But a study like this reminds us we do have significant control of what happens to our bodies.