Each five years, law requires the U.S. Department of Agriculture and the U.S. Department of Health and Human Services to review the latest science and update advice on what Americans should eat and drink. The Dietary Guidelines for Americans are designed to provide current dietary advice to promote health, help reduce risk of chronic disease, and meet nutritional needs across the lifespan. The guidelines also serve as a foundation for federal food, nutrition, and health policies and programs like the National School Lunch Program and the Supplemental Nutrition Assistance Program (SNAP), to reduce hunger and increase food security through access to healthy, affordable food.