Final answer:
The Dietary Guidelines are updated every five years to reflect the latest scientific evidence on nutrition and health.
Step-by-step explanation:
The Dietary Guidelines are designed to help Americans make healthy dietary and lifestyle choices and are updated every five years. They are based on the current scientific evidence that advises on healthy eating patterns, including moderate calorie intake matched with physical activity. The guidelines are a key resource for professionals and play a significant role in shaping public health policies. The most recent version correlates with the MyPlate food guidelines, which emphasize a balance of vegetables, fruits, grains, dairy, protein foods, and oils within an appropriate calorie level.