Does 'My 600-lb Life' contradict Oprah, Weight Watchers on weight loss?

Oprah Winfrey and other celebrities have claimed to lose weight while still eating all their favorite foods on Weight Watchers. But the TLC reality television show "My 600-lb Life" disproves major aspects of the famous diet plan. Dr. Younan Nowzaradan's bariatric surgery diet seems to contradict WW on dieting and foods to eat for weight loss. Is it possible, as Oprah says, to have your cake and weight loss too?   'My 600-lb Life' disproves Weight Watchers: Can't have cake and weight loss too