The gold standard food intolerance treatment is the elimination diet in which the food is no longer consumed in any form. There is no dietary intake of the food in whole or component form. For example: if one was intolerant to corn then corn would not be eaten as whole kernel corn, corn-on-the-cob, creamed corn, corn syrup, corn meal, popcorn and other ways corn is used in food. Additionally, ingredients such as cornstarch would be avoided in other foods. Then research of each processed food that is consumed would begin in order to eliminate foods that contain corn derivative ingredients. The goal is total elimination of corn in the diet to ascertain whether or not corn was the food causing the intolerance.
There may be a time after an intolerance is identified, and the offending food has been eliminated from the diet for some time, that the sufferer may have reason to try again to eat some foods that contain the offending ingredient. If this is so, then there may be some additional experimentation needed to determine the threshold of consumption of the offending ingredient at which symptoms begin to manifest. For the best health outcome, total elimination is the goal.