Most supermarkets stock more than 30,000 items, yet every time we race up and down the aisles of the grocery store, we toss into our carts the same 10 to 15 foods. Which isn't such a bad thing, as long as you're taking home the right foods--ones that will keep you healthy, fuel peak performance, and easily cook up into lots of delicious meals. So before your next trip to the grocery store, add the following 15 foods to your must-buy list. Then, when you get home, use our tips and recipes to easily get them into your diet and onto your menu.