What are the symptoms of food intolerance? does it vary from person to person?

Food intolerance: Symptoms of food intolerance are widely variable between people, and the foods themselves. There can be belly cramps, nausea, diarrhea, belching, body aches and pains, dizziness, rashes, difficulty with memory & concentration, etc. There can be days between eating a problematic food and perceptible symptoms, so diagnosing can be confusing. Integrative or functional medicine physicians can help.