In 1984, Carl Lewis won four gold medals at the Los Angeles Olympics. At the 1991 World Championships in Tokyo, he set a world record of 9.86 seconds for the 100 meters. By the time he retired in 1996, he had bagged nine Olympic gold medals and had written himself indelibly into the list of all-time great athletes.
The secret of his success? Lewis was fueled by a diet of rabbit food. During the crucial training periods for his competitions, Lewis was a vegan, avoiding all animal products in his diet. A hippie? A crank? A limp-wristed, bead-wearing radical? No -- he was the fastest man on Earth. That pretty much wraps up the case for whether humans need animal products for a healthy lifestyle, doesn't it?
Actually, it doesn't. What about long-term health? Lewis might be quick on his feet, but if he avoids animal products for the rest of his life, won't he suffer from some deficiency when he's older, or be more prone to some disease? Anyway, isn't it natural to eat meat? Isn't meat an essential part of a healthy diet?