This is a very low effort, unsourced listicle, that is probably wrong on several points. Disregarding that, I was more curious about how this particular person managed to get hospitalized.
True enough, but it does outline the potential nutritional shortfalls of extreme food regimes, most of which I was aware of. It seemed to sum up most of the obvious shortfalls - I was only passingly interested and this was a low hanging answer. I have seen numerous extreme diets. Many of which are OK in the short term - but not in the longer term. Unless the OP replies - I have no idea in detail what befell him?