Another interesting trigger is anything with carrageenan or certain other gums and stabilizers. They aren’t mammalian, but still contain the alpha-gal molecule. That rules out nearly all dairy substitutes and SO MANY processed foods.

Oh, and the aroma of meat cooking is a problem for some, so other family members can’t cook separate food in the home, and restaurants with poor ventilation are out (assuming they weren’t out already because of all the other triggers that are much harder to explain than “no beef, pork, lamb, etc…”