The Dietary Guidelines for Americans encourage all Americans to eat a healthy diet and be physically active. The new Dietary Guidelines "MyPlate" is an easy tool to help you think about food choices at each meal, control portion sizes, and ensure balanced nutrition. Grains play a key role in maintaining a healthy diet. Eating grains, especially whole grains, as part of a healthy diet can help reduce the risk of chronic diseases such as diabetes, heart disease, some cancers, and obesity. And, if you're trying to slim down, studies show that adding whole grains can help maintain a healthier body weight.