I was on keto for short of a year, between 7 and 9 months or something and while it wasn't awful. Neither are carbs. I didn't have a 6 pack then. I'm ripped now. Though that is literally just calories in calories out and has absolutely nothing to do with the actual diet. >and get really sick keto-flu is a thing. Look it up. Diarrhea, headaches, tiredness, soreness etc. It's just the body getting used to it's new food source as it deactivates carb focus to fat focus for energy. >develop autoimmune disorders Un-fuckin-likely and literally impossible. Ketosis is a natural process in the body that exists regardless of being on a keto focused diet or not.