I know we all love lean ground beef, but if you use beef with a little bit of fat, your burger will be juicier than if you simply used all lean beef. Beef is a natural source of essential nutrients, which makes a great protein source you can enjoy every day. Beef up your diet for good health! You may not realize that research shows that including lean beef daily as part of a healthy diet can help lower cholesterol levels, and exercise is more effective when paired with a high-protein diet.