Because she insisted that she was dieting her way into her unnatural appearance, people started to ask Lukyanova for diet tips. She was happy to oblige, but her diet tips didn't make sense. Not only that, they would have been dangerous for anyone to follow.
At one point, she even claimed that she was a 'breatharian' - someone who lives on nothing more than sunshine and oxygen. Clearly, that's impossible, and anybody who took her advice would have become seriously ill.