The keto diet could cause low blood pressure, kidney stones, constipation, nutrient deficiencies and an increased risk of heart disease. Strict diets like keto could also cause social isolation or disordered eating. Keto is not safe for those with any conditions involving their pancreas, liver, thyroid or gallbladder.
Kleinman said someone new to the keto diet can also experience what's called the "keto flu" with symptoms like upset stomach, dizziness,...