I followed a ketogenic diet for 4 years after a thyroid cancer diagnosis, it was recommended to me as a future cancer preventative by my naturopath. I learned so much about the metabolic process and how our bodies use food to make energy. Doing the ketogenic diet strictly helped me to break my sugar and gluten addictions (yes, our bodies get addicted to these things) and become much more aware of good vs. bad carbs. I don't follow the diet strictly anymore, but it does still inform my food choices and I think it (like any other diet) can be done in a way that is super healthy. It's easy to rely on animal products and fake sweeteners to keep yourself in ketosis, but that's not really the point of the diet. To do it well, you should really be eating lots of green vegetables and good fats with just small amounts of clean protein. Writing this comment has got me realizing that I need to write my own post about going keto!