if your eating really well otherwise you are probably sensitive to the harshness and density of it as well as hormones, slaughter etc. personally i think it is a mixture of everything. I have been eating healthier and i went to the movies and had one of there hot dogs and puked the whole thing up when i got home. the next meat i had was in a cup of noodles type thing and i puked that up too. but i have been able to handle those things at other more unhealthy times