That's because protein, more precisely the amino acids that are the building-blocks of protein, is actually used for fuel during intense exercise, particularly when carbohydrates are not available. Most people can get enough protein through their diet, eliminating the need for protein supplements. Lean cuts of red meats are not bad for athletes. The best choices include flank steak, London broil, eye of the round, and extra-lean ground beef. Besides being protein-rich, lean red meat is an excellent source of iron and zinc.
Some athletes are afraid of the cholesterol in red meats.
But actually the cholesterol content of red meat is similar to that of chicken and fish. Yes, fatty hamburgers, pepperoni, bacon, and ribs are unhealthy and should be eaten only occasionally, if at all. But athletes can healthfully have about 4 oz of lean meat two to four times per week. In fact, a lean roast beef sandwich could be a healthier choice for the heart than a veggie sandwich packed with cheese. Vegetarian athletes can eat enough protein to satisfy their bodies' needs if they wisely choose plant proteins.