Firstly, it's not always about giving things up. Just cutting down on this stuff is going to pay off in the long-run. But, did you know that almost everyone on the planet can be intolerant to cow's dairy? The proteins in milk (casein) or the milk sugars (lactose and the sci-fi sounding galactose) together with the size of the fat molecules, don't tend to sit so well with our digestive systems most of the time. This can lead to some horrible side-effects in the short-term, and more serious digestive complications in the long-term.