I had kinesiology sessions to diagnose which foods I was intolerant to, and it did seem to work, I mean when I cut these foods out my symptoms disappeared.
Sceptics will be saying "oh it was all in your mind, you never had any allergies and cutting out the foods was merely a placebo effect." Many people have been rude enough to say this to my face.
I recently had a prick test that confirmed my allergy to wheat (now much reduced). No other foods were tested, becuase the doctor was looking for hay fever not food allergies, but it did confirm the wheat allergy that the kinesiologist had already diagnosed.
The test involved me holding bottles of unknown liquids, while the doctor tested how strong my muscles were, by pushing my arm down, while I had to push up. I had a weird experience with one of the little bottles, where my brain told my muscles to tense, but they just wouldnt, and my arm was really weak. I asked immediately, what was in the bottle, and was told that it was tartrazine.
Yes, it did feel like magic, but I cant say that there was nothing behind it, because it did seem to work.