Cook from scratch! Home cooked foods taste so much better than the nasty boxed stuff, and you will feel better because you are eating healthier foods.
Replace simple grains (white flour, white rice, white pasta, etc.) with whole grains (brown rice, whole wheat pasta, whole grain breads, etc.). While whole grains may cost more, they have more nutrition and are more filling, so they really are the better value.
Frozen fruits and vegetables have a longer shelf life than fresh and retain their nutrition longer; they are often a better, less expensive option than fresh.
Once or twice a week have breakfast for dinner. Popular options at my house are: yogurt parfaits with frozen berries and whole grain cereal; veggies omelettes with a bit of cheese and whole grain toast; whole grain pancakes with fruit.
at 3:31 PM on Mar. 12, 2011