Psychosomatic or not, IMHO it's not worth the shrink hours to correct a perceived gluten intolerance so it might be easier to just not eat gluten grains, since the nutrients are found elsewhere. (I'm not hating on psychiatrists, btw; I have psych friends).
I don't really believe that the anti-nutrients in grains or legumes do any significant damage over the short-term. I too, ate PBJ's in elementary school and literally pounds of pasta during my teenage growth spurt. It's the cumulative damage over the long term from three constituents I'm concerned about
1) phytic acid, which is a very negative molecule that binds readily to positive ions like calcium, magnesium, and potassium and decreases absorption in the intestine;
2) lectins, which are plant proteins that can irritate the intestinal lining and increase it's permeability to larger molecules and proteins, which then provoke an allergy-like immune response;
3) canavanine, an amino acid found in beans that resembles arginine. It can take arginine's place in certain proteins, which screws up their structure and renders them useless. It also interferes with arginine's ability to stimulate the production of nitric oxide, which relaxes blood vessels and reduces blood pressure.
Here's three things I'm not concerned about
1) natural saturated and monounsaturated fat, and w-3: SFA's are used as energy when there's little exogenous glucose floating around. Many also only raise HDL, and not LDL. Notable exception being palmitic acid, found in palm oil. MUFA's and w-3's produce anti-inflammatory byproducts. w-6's on the other hand, produce inflammatory byproducts.
2) protein: up to 1g/lb body weight combined with heavy lifting promotes dense bone growth.
3) getting enough glucose: the human liver manufactures about 720 calories worth of glucose per day, mainly from glycerol, the backbone of fat molecules. This is more than enough to power the brain.
I'm not trying to pick a fight or anything, I'm just a biochemistry nerd with time and a loud mouth. Don't take it personally