This is written by someone who has never had to convince people to do what they know they should be doing. Diet and exercise (i.e., what to do) are solved prob

This is written by someone who has never had to convince people to do what they know they should be doing. Diet and exercise (i.e., what to do) are solved problems. The hard part is convincing people to change their behavior (i.e., how to get people to do it). The medical profession is constantly searching for better ways of doing this (e.g., motivational interviewing). And while you work on changing their habits, the disease process is still causing them harm and if there exists a medication that can mitigate that harm that a patient is more likely to take, the risk:reward ratio often leads to a clear recommendation.