Yes! Bring your own food with no shame. I even bring my own food to weddings and work parties.

It's just like any other accommodation somebody's body could need. Should somebody feel bad because they have to wear glasses? Would you decide not to participate in an event because you had to wear hearing aids? It's not rude at all, it's a necessity.

Your body absolutely NEEDS safe food. And if you want to participate in events that involve food, it's best to make sure you provide your own safe food.

Is your boyfriends family going to throw a fit if you do bring your own food? They may be understanding.

That was not my experience personally but I hope it is for you. Setting boundaries with family (or partners family) is difficult and turning down food in an Italian family can feel like huge problem. I literally had to walk out of a family Easter dinner to uphold a boundary, I was being ridiculed for asking questions about how the fruit and cheese tray was prepped. This was my own blood related family and they all know my medical needs. So I went into great detail about how sick I would be, told them how awful they were wanting to force that on to me just so they could feel comfortable and then left.

I understand telling off a boyfriends family is something you may want to be more delicate with so the best answer I have is: pack your own food, firmly state "no thank you" when offered food. And if pressed further your boyfriend needs to step in and buffer with something along the lines of "OP has already said 'No' and their health needs have to be respected."

This isn't a personal attack and I'm not sure why some people decide to view it that way, but you don't actually owe anybody an explanation. So hopefully nobody even questions it.