Talking to your parents can be really scary if you fear being criticized or scorned. I often dreaded bringing up certain subjects with mine for this reason. Sometimes they really dont react as badly as you think they would, or at least you find it wasnt as bad as you thought it was going to be. Just play it out in your head: Go ahead and pick out the wholegrain bread yourself and bring it to the cart. "Mom? Can you get this wholegrain bread for me? I mean, you dont have to eat it, but I know it is really good for me, which is why I want it." Take it one item at a time. Dont try to buy out the entire store until they become more used to the whole idea. You also dont want it to cost a lot of money (but you still need to eat!) and the cost of food might be one of the things on the forefront of your parents mind.