It may work if what you're reactive to is dairy and or wheat.
If your intolerances are something else, such as another food group, it won't do anything for you.
Other common culprits are non-food items, such as dyes, preservatives, MSG, and yeah, even trans fats for some people.
True, dairy and wheat are the most obvious food allergies, probably because someone developed a test for those.
But you can have inappropriate reactions to anything made of...matter. I seem to have been the poster child for that.
Seeing an allergist (M.D.) is of limited usefulness. They test for perhaps a few components of dairy, like casein or some other protein. But if it's the fat that sends you, the doc will say you don't have a problem.
Plus, M.D.s assume the only allergic response is an Ig response, though this is beginning to shift...finally. Well, there's more to allergies than histamine responses, sorry. All the Benedryl in the world wouldn't do a thing for my allergies, but a 4-day migraine and blood pressure on the verge of a stroke is pretty hard to miss.
I do naturopathic counseling for people who have food allergies in particular. If someone wants to try the elimination diet routine, it has the advantage of being free at least. I usually have people get off all dairy, wheat, trans fats, and chemicals as much as possible. Then we see what happens and work from there.
Yes, I have had clients (and so has the person that's done my allergy treatments) that have had all sorts of symptoms go away after the allergies were discovered and managed. Symptoms are everything from "Restless Leg Syndrome" to meltdowns to brain fog to panic attacks to seizures to common bipolar symptoms. So yes food allergies might be a cause of some of that.
I would caution anyone with aspies or autism though, it's just ONE thing to look at. There seems to be much much more to aspies and autism, and the idea that health conditions only ever spring from one thing is not correct.
If your insurance makes it worth your while and you want to look for food allergies, there's certainly no harm in going to an allergist. But if that hasn't cleared up what's going on, see if you can find an applied kinesiologist -- their testing is non-invasive and far more complete when you're trying to track down what's bothering you.
Also, it's possible now to have those inappropriate reactions, not just to foods, but pollen, pets, and various chemicals either removed entirely or, at least beaten down to a level that is tolerable, provided you can get to a location in the U.S., Canada, or Australia.
I know it works, because both my daughter and I used to be able to eat nothing but organic red meat, some brands of brown rice, and a few organic root veggies and fruits. Now we can eat anything, provided it's honest food.
My most obvious allergies were dairy and corn. But today I ate Mexican and I'm fine. Two years ago if I'd just walked into the restaurant, I'd have been on my way to the ER in less than 10 minutes.
Oh yes, and I used to have Chronic Fatigue Syndrome/fibro. Now, I don't.
That's how I went into naturopathy. I had to find my own cures, and ended up learning so much I finally got formal about the education part and set up shop. I doubt I'll be going back to a chemistry lab anytime soon.