From my experience, I found it was easier to feed our son a healthy diet until he grew and he became very sensitive to smell, then it stopped. However, I think if you subject the child to quality foods on a consistant basis the likelyhood he will gravitate to them later in life are greater. It is really hard to prevent a child to being exposed to addictive foods by attractive marketing, friends and school. My son is a carbo addict at 18, but he does appreciates a lot of good foods. He is normal body weight and health, I just notice all the simple carbohydrate snacks he enjoys tend to make him more emotionaly unstable.