Diet Dr. Sylvestre has had great success with muscle testing for food allergies or food sensitivities. He has discovered that what appeared to be symptoms of migraine headaches or arthritis for instance, were in fact the body's response to food allergies. Dr. Sylvestre employs food sensitivity testing on a regular basis with remarkable results. His intention is to be able to reintroduce foods to the body, by removing food from the diet and desensitization to allow the body to rest.