The NHANES is a program of studies designed to assess the health and nutritional status of adults and children in the United States. The survey is unique in that it combines interviews and physical examinations. The NHANES program began in the early 1960s and has been conducted as a series of surveys focusing on different population groups or health topics. In 1999, the survey became a continuous program that has a changing focus on a variety of health and nutrition measurements to meet emerging needs. The survey examines a nationally representative sample of about 5,000 persons across the country each year.

The NHANES interview includes demographic, socioeconomic, dietary, and health-related questions. The examination component consists of medical, dental, physiological measurements, and laboratory tests. Findings from this survey will be used to determine the prevalence of major diseases and risk factors for diseases. Information will be used to assess nutritional status and its association with health promotion and disease prevention. NHANES findings are also the basis for national standards for such measurements as height, weight, and blood pressure. Data from this survey will be used in epidemiological studies and health sciences research, which help develop sound public health policy, direct and design health programs and services, and expand the health knowledge for the Nation.

In 2012, the NNYFS was conducted in conjunction with the NHANES in response to the need for data on physical activity and fitness levels in children and teens. The NNYFS collected data on physical activity and fitness levels of U.S. children and teens, ages 3 to 15, through interviews and fitness tests conducted in state-of-the-art mobile examination centers. The addition of the NNYFS data will provide information with which to evaluate the physical activity and fitness of our nation’s children.