Your body adapts. It's mainly down to your gut microbiome being able to handle it.

I'm a helpless cheese/dairy addict, trying to cut off as much meat as possible. Unfortunately, a few years ago my body had decided not to deal with that anymore, and I became slightly lactose intolerant. Now, I can either go vegan and end up eating shittons of legumes, or I can keep eating cheese (my workplace provides free food, but basically everything has cheese in it). I'm trying my best to keep them alive, but it's not easy.