The Keto diet has been br praised as a quick weight loss br plan, but health.com warns br about these potential side effects. br 1. The "keto flu" br 2. Diarrhea br 3. Limited athletic performance br 4. Ketoacidosis br 5. Regaining weight br 6. A decreased metabolism and less muscle mass br 7. Higher risk of heart disease and diabetes br Consult a physician before starting any new diet plan.