Life Jillian Michaels slams the keto diet: ‘Why would anybody think this is a good idea?’ January 10, 2019Josh Hafner, USA TODAYComments Off on Jillian Michaels slams the keto diet: ‘Why would anybody think this is a good idea?’ Former "Biggest Loser" trainer Jillian Michaels told "Women's Health" she gets "fired up" over the keto diet and its weight loss promises.