I personally reference books or magazines on nutrition from time to time to keep the right perspective. I have numerous in my home that I pick up periodically and read. It serves as a reminder to make healthier choices.

I try to never go to the store hungry. I think we definitely tend to purchase more and maybe even purchase less healthier foods when we are shopping hungry. Walking down the cookie or ice cream isles while hungry is not a good thing!
Shopping at health food stores tends to help me make better choices as well. A good health food store is typically stocked with less junk food and and a good health food store generally will promote healthier foods and food choices.

Oh it's definitely important to go to the grocery store on a full stomach. I never even walk down the snack food aisles. What helps me most is using baskets rather than a shopping cart. (But I'm only shopping for two).

Those are great suggestions - thanks for sharing. There is something to going to the grocery without being hungry. I also like the idea of shopping with a basket instead of a cart when possible -- less room for impulse buys!