Hamburger combines meat from many animals. This increases risk of mad cow disease, and makes it riskier to undercook the meat in general. Different, lower “qua

Hamburger combines meat from many animals. This increases risk of mad cow disease, and makes it riskier to undercook the meat in general. Different, lower “quality” parts of the animal are used. Also, because the meat has risks, it is often treated with preservatives.