You may find that some foods will always trigger a reaction, while others are only a problem if you eat a food too often or eat too much at one sitting. With time, you may be able to include some foods you’re sensitive to in limited quantities. Once you know your triggers, begin testing with new foods. Done correctly, an elimination diet can show good results. Lily Nichols, for example, says that her patients can see up to a 70 percent reduction in symptoms by the end of one month.