The Oprah Winfrey Show aired an episode earlier this month, wherein she and 378 of her staffers decided to go on a one-week vegan challenge. It meant no consumption of meat, fish, milk, eggs or anything that comes from an animal, for seven whole days. The challenge was led by The New York Times best-selling author Kathy Freston, who swears by the vegan lifestyle for seven years now. One of the most impressive success stories came from the video editor Rich, who lost 11 pounds during the week-long challenge. He stuck to the diet, opting for vegetables and whole grains over simple carbohydrates.