For example, I am hooked on jogging. I like to jog every day, but if not, at least several times a week. When I am unable to fit jogging into my schedule, I am not a pleasant person to be around. That's what I mean. You can get attached to good behaviors, like physical activity, as easily as you can to bad ones.
Nutrition is the same.
By getting into the habit of eating at least five servings fruits and vegetables each day, you can much more readily turn away those foods that are not healthy. The American diet is too loaded with fats and sugar and too lacking in fruits, vegetables, and grains. It never ceases to amaze me to learn of the unhealthy lifestyles our college students are keeping. Most of them will become addicted before they are 18. The misuse of alcohol is another major problem.