Quick answer: If you feel worse after you start eating healthy, the food usually isn't the problem. Your gut is. Common causes include adding too much fiber too fast, healthy foods that are hard on a sensitive gut, SIBO or other gut imbalances, low stomach acid or digestive enzymes, food sensitivities, and not absorbing the nutrients you're eating. Finding which one fits you is how you start feeling better. Feeling worse after eating healthy is often a sign of how your body