I have spent a great deal of time reading up on food intolerance and food allergies. They are different because reactions within the body are different. Allergic reactions can be life threatening, quite severe, and most often occur immediately. Food intolerance or sensitivity reactions can also be severe, but often cause major problems over time.
Here is a link to one article I found: http://www.drlwilson.com/articles/food_intolerance.htm
All of these articles are written by doctors who see definite connections to health problems caused by eating certain foods. Many of the articles I have read today suggest an “elimination diet” to find out what you are allergic or intolerant to. That is basically what I did with the guidance of my registered dietician’s detox program.
If you suspect you have issues with any foods you may consider this approach since it is relatively inexpensive and fairly easy to do with a little prep work. To succeed you should read the literature, buy things which you can eat on your program, and try preparing things ahead so you will not be starving as you are trying to figure out what you can eat.