In 2013, John Cisna received worldwide attention from a high school biology experiment that tested the hypothesis, "Is it possible for a person to become healthy eating nothing but fast food?" The results of The McDonald's Project caused people to look at how we eat in a different light, and John spent the next two and a half years traveling the United States speaking about the importance of choice in our diets. Now you can read about John's experience as a McDonald's brand ambassador, the controversy that swirled around him, and how he took what he learned from his original experiment to become healthier and stronger than ever before. John's fast-food odyssey led him to the Fountain of Youth, and he'll show you how you can get there, too.