Muscle response testing is one of the the most reliable ways to determine what every individual person may or may not tolerate any particular moment. It is also called applied kinesiology, and most often tested muscles are muscles of the arms.
You can be tested for different medications, different foods, and anything else. You cant test yourself. Testing must be done by an experienced practitioner of muscle response testing.
If person's muscle is weak when some food item or medication is hold on the stomach, that means that person does not tolerate that particular food or medication that moment.
If you repeat testing for many different foods many times, you can get very reliable lists of foods that you tolerate.