17. Red Beef.
Beef has been a dinner staple in the American diet for decades, but recently, beef has been under scrutiny for being damaging to the heart. This has led many who want more protein to search for grass fed beef options to increase overall protein consumption. A three ounce serving of grass fed beef has more than 20 grams of protein, but red beef such as this offers the most complete forms of protein for your body, which means your body can use it more effectively to heal and rebuild tissue. If you want to be bigger and stronger, simply add more grass fed red beef to your diet.