Watch CBC Wild Docs online: Episode 3 Fast Food Junkies Go Native

Fast food addicts swap diets with an ancient tribe whose eating rituals date back thousands of years. For many of us, the holiday season is a time of overindulging in sugary, fat-laden treats. But could you give it all up? How far would you go to give up unhealthy food? In an extreme television experiment, four fast food fanatics trade their Western diet, for the diet of one of the healthiest communities in the world. The traditional Western diet has been linked to diabetes, coronary heart disease and cancer. Time for some extreme diet therapy as four junk food addicts are sent to a remote region of Northern Pakistan. There, they're forced to adopt the diet of the Shimshal people, which includes locally grown fresh fruits, vegetables, and yak meat. Exercise also becomes part of daily life - fetching firewood, carrying water, working in the fields and herding animals. Not all of them will make it through, but for those that do, it will be a life-changing experience.

click here to see where to watch or .