There are some dangerous risks and side effects involved with keto. For example, if ketone levels become too high, you become at risk for ketoacidosis (DKA), a life-threatening condition that occurs when you don’t have enough insulin in your body. “Keto flu” is a common side effect of the keto diet, accompanied by symptoms of fatigue, headaches, and pain as a result of dehydration and loss of electrolytes. Other unpleasant effects of keto include higher risk for kidney stones, bad breath, muscle cramps, and dizziness.
In terms of effectiveness for weight loss, some studies suggest that the keto diet may work, but the studies were small, and one study even found that people had higher levels of inflammation and worsened moods. California author and speaker Dorena Rode found that her cholesterol levels actually increased to a dangerous level on the high-fat diet.