Oh yeah, I can imagine.

I have a mate I shoot with who is lactose intolerant and he is ultra-careful when he eats out, even when he comes here, I always make sure I've got the right milk for his coffee. I suggested he might want to drink it black like I do, but nope, no can do. It must be difficult for those with allergies, I'm lucky in that being diabetic isn't as bad as all that and I can usually find something without any fuss.