Black Label X More information More guides Would you like to know more? We have more guides on the keto diet All Keto guides Possible side effects of a keto diet Suddenly changing your body's metabolism from burning carbohydrates (glucose) to burning fats and ketones can have some side effects as your body gets used to its new fuel, especially during day Symptoms may include headache, fatigue, muscle fatigue, cramps and heart palpitations. http://www.botaniclabny.com/