Documentary about how the Namgis First Nation of Alert Bay takes up a dietary challenge and returns to a traditional style of eating for a year to fight obesity and diabetes. The rules were simple: eat lots of protein, fat and vegetables; give up sugar, junk food and starch. Through the stories of six people, it documents a medical and cultural experiment that may be the first of its kind in North America. "My Big Fat Diet", like "Super Size Me", looks at the problem of obesity, through the eyes of a man who straddles two cultures, Western and First Nations. It also looks at the history and present-day status of traditional food gathering, and the link between individual health and that of the immediate environment.