The USDA Food PyramidNotes: For the health conscious group of five, the food pyramid group costume should provide a serving of fun on Halloween eve. It's also a great reminder not to overdo it on the candy, which the USDA suggests we use sparingly. Bummer. Shopping List: Black T-shirts, velcro, and plastic foods corresponding with your group. For added "wow" factor, arrange yourself in a human pyramid to resemble your food pyramid, but only if you are trained to do that kind of thing and totally sober.