The tricky part is determining what is "good" and what is "bad". In my experience, much of the conventional wisdom on "healthy diet" is bunk. Also the stdev of human physiology is so vast that what is healthy for one person may be harmful to another. There is well documented evidence of harm from low fat and low sodium diets, for example, which can be devastating for some people. And should we bring in the fad of "meatlessness" that is approaching criminally insane levels today? It can be a challenge to figure out what is really healthy, especially if you are prone to listen to others rather than how your body is reacting.