Is drinking 1/2 gallon of milk a day ok?

Not in my opinion: There is no consensus on this & research studies show conflicting results, but 1/2 gallon seems excessive to me. I say more water/less milk! i believe cow's milk is the perfect food for baby cows but not for adult humans! if you do drink milk i strongly advise choosing rbgh-free & ideally organic milk. For the pros & cons of this issue see http://milk.Procon.Org/view.Answers.Php?Questionid=1317.