la petite moi

I've been talking to my boyfriend lately about his eating habits. Now, I'm not trying to get in his face and order him around- but I'm concerned. He eats those TV dinners that are packed with sodium and fat. He drinks sodas with tons of sugar. He doesn't skimp when it comes to eating a meal.

He is not overweight yet (5'7, 152 pounds), but I'm worried that with the way he eats, he will eventually deteriorate his body. Yesterday, I told him his BMI is 24 (a point away from 'overweight'). This is mostly because he has muscles. He went to his mother (a dietitian), and asked her if he was getting fat, and she said no. The problem with this is that she does not really encourage healthy eating, even though she is a dietitian and SHOULD!

Should I just let this whole eating thing drop, or should I continue to encourage healthy eating myself?

Edit: I'm 18, he's 19. We don't live together. He wanted me to point out that he used to do judo two times a week for two hours at a time. He hasn't done it since January though, because he works/wants to spend time with me. Is four hours of judo a week still enough to 'counteract' TV dinners and soda though?!