Listened to a lecture available on The Great Courses about health and nutrition by Dr Anthony A. Goodman. He talks about the dangers of low carb dieting and how it makes people feel sick. Basically carbs are a clean burn fuel and stored fat is a dirty burn producing byproducts in the system. In states of Ketosis? I think was called where you are constantly burning fats you can acidify the body causing damage to internal organs and end up in a state similar to a diabetic who has not got insulin. Sadly I was listening in my car so not actively studied all the bio stuff but remember he made a convincing case for people on low carb to be very careful.