RIch Roll

Following world record marathon runner Fiona Oakes in her attempt not only to set a new global record in endurance racing, but to compete in the `toughest footrace on earth', the Marathon Des Sables, a 250km race through the Sahara Desert.

In this documentary, a former meat-eating college football player goes on a journey to rediscover the athlete within—this time, as a vegan.

Scientific experts in the fields of nutrition and biology give their opinions on the way human beings consume, grow and treat their food.