One common cause of insufficient carbohydrate intake is high protein / low carbohydrates diets (such as the Paleo or Atkins or ketogenic diet). In this case, the production of ketones is intentional. By depriving the body of carbs, the body is forced to burn fat stores. Other causes of the state of ketosis (high production of ketones) from too little carb intake include: Anorexia, Fasting, Excessive vomiting, Diarrhea, Undereating, or Starvation.