A war of words erupted between former “Biggest Loser” trainer Jillian Michaels and “Today” show's Al Roker over a popular diet. The keto diet promotes high fat and low carb meals. It encourages followers to fill up on fatty foods like bacon, avocados, eggs and cheese, and avoid carbs like bread, bananas, apples, and beans. Michaels believes that's terrible advice. Al Roker, who has struggled with his weight all his life, has been on the keto diet since September, and took a jab at her comments.