A small serving of avocados, around 1 ounce, is low FODMAPs. Avocado oils and avocado oil spray do not contain any carbs and will be FODMAP-free. Being aware of the portion size will determine how high or low the fodmap is for avocados. A 2 tablespoon serving is considered low. To keep this recipe low, serve the tuna salad with 2 tbsps of diced avocado on a bed of lettuce or by itself.