And I wouldn't even call that a problem if what they were going for was a sustainable extreme. More power to anyone who gives up all unhealthy food in the same way that an alcoholic needs to give up all booze. At least if they can sustain that for their entire life. Which they can't. The big problem is that with few exceptions the fat people who try that go about it in the laziest possible way. There's tons of healthy food out there that'll match perfectly with one's tastes. But they never actually explore the options to find food they'd like. They just assume that they're going to be able to live on the same salad three times a day for the rest of their life. And it's like no shit that's going to end in failure.