Our son was diagnosed when a baby with peanut allergy. Now 12, he has started having some kind of reaction/sensitivity to mexican restaurants -- the family owned kind. Taco Bell is fine. But any other local place we try, he ends up with a headache and feeling sick. We avoid mole sauces. He simply orders tacos with rice and beans. We're perplexed. Anyone else have similar experience? A friend raised the question of MSG?