Honestly, if you want to start researching, Doctors Eric Berg and Ken Berry will have some good information on what causes what based upon nutrient, vitamin, or other deficiencies in your body, Dr. Berg especially. Research those to fact-check, as they usually have some fantastic evidence to back them up (in my opinion).

Keep in mind that Dr. Berg maintains a specific form of ketogenic, while Dr. Berry is a carnivore (meaning you don’t eat any plants at all, but animal fat, meat, butter, and milk).