You're advocating between drugs and the alternative you listed. The problem is the alternative you've listed are usually for prevention not as a cure. At least

You're advocating between drugs and the alternative you listed. The problem is the alternative you've listed are usually for prevention not as a cure. At least all the papers I've seen are observational and retrospective. Drugs on the other hand are design experiment, clinical and casual. You don't cure cancer with exercise and good diet.