Elimination Diets Part 1: The Whole30 and Autoimmune Protocol (AIP) In cases of food allergies, intolerances, or sensitivities, they may provide unpleasant symptoms such as bloating, gas, or constipation. And they may also cause non-GI issues such as headaches, acne, joint pains, mood changes, low energy levels, and itchy eyes. Everybody’s body responds to foods differently. Sometimes, our body doesn’t necessarily love every food we eat, or our immune system might recognize something as a foreign invader. One common strategy to find out what's causing your symptoms is to perform an elimination diet. Elimination diets help to identify the foods your body does and does not like (and the reaction can be temporary until you heal).