You can definitely be allergic to the soy milk
. Also, soy is one of the prime suspects in the food elimination diet that must be avoided while on the diet 'til ready to challenge. You can develop new or different allergies at any time. I myself am allergic to yogurt and kefir
. I discovered why it's worse for me than the tiny bit of regular milk used in my coffee (I'm sensitive to soy myself), too. And, it isn't the beneficial bacteria added to the stuff either.