At its core, food is fuel. Every living organism on earth relies upon some form of sustenance to get through the day. Today, humans have a very different relationship to food than past generations. On top of having access to virtually any food we desire, our understanding of nutrition has greatly expanded.

In the olden days, it was normal for professional athletes to eat steaks and drink beers before their games. Now there's dozens of diets and nutritional ideologies wrapped up in the sports world. With all this information, the new question becomes: what information should we trust? We talked to all different types of athletes and several nutrition experts this week to find out the myriad ways that food is used to enhance physical fitness and performance.

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