So when looking for protein-rich foods, watch what comes along with the protein. Vegetable sources such as beans, nuts, and whole grains are excellent choices and include healthy fiber, vitamins and minerals! The healthiest animal protein sources are fish and poultry. If you're an eater of red meat, choose the leanest cuts and moderate portion sizes.
The USDA introduced its first food guide in 1902. Known as the Atwater guide, it laid the foundation for recommended food groups and serving sizes. After 109 years and almost a dozen changes in content and form, the USDA has just published a new, simpler guide based on recent accepted nutritional research.