The only reason adult cows, or most any other mammal, stops drinking milk as they get older has nothing to do with the milk being bad for them (or us). Anyone who has spent time on a dairy farm knows that the calf stops drinking because momma cow forces it to stop - sometimes quite aggressively with lots of kicking. The calf gets too big and momma gets tired of it teething on her teats. It's that simple. The calf learns to supplant the nutrients it was getting from mom with other foods. And, yes, we could learn to do the same and go without milk - but why? The reasons for us not drinking milk as an adult are mostly personal and philosophical, and not tied to real nutritional or physiological harm. There were studies from 20-30 years ago that tried to tie milk consumption to increased risk of some cancers and osteoporosis. And while some of these followed large population groups, they were very poorly controlled and the conclusions that were tied to milk were tenuous at best (these are the studies that I'm guessing most doctors and nutritionists are leaning on when suggesting that milk is bad for you). Subsequent studies haven't drawn similar conclusions and most find some milk to be beneficial in your diet. Milk is best for you when it's whole milk;skim is missing the fats that aid in the absorption of the vitamins and minerals that are in it. So, if you're drinking skim milk you're really only do so mostly for the taste, not the nutritional benefit.
If you're going to give up something from a cow, it should be red meat. Red meat consumption is one of the strongest indicators of increased colon cancer risk. I love a good steak or roast and still eat it occasionally, but have reduced it to probably only 5% of my diet. Sad, I know.
:duck:
Whenever I hear people saying that drinking milk isn't good because it's "not natural" or "cow milk isn't make for human consumption" I wonder what they think about eating fruits (or pretty much anything else). Plants make fruit around seeds to give the seeds enough nutrients and water to get it started growing - the fruit is not required if someone plants the seed in nice moist soil but nature doesn't provide a reliable way for seeds to get buried without help. An apple falling from the tree will allow the seed to grow in a very small percentage of cases, otherwise you'd have hundreds of apple trees growing under every tree, but it's still a lot higher than if the seeds fell alone on the ground without the apple. Or perhaps an animal carries the apple somewhere and eats part and drops the rest with the seeds somewhere and a tree will grow. But... humans still eat apples because they're delicious and we can get nutrients too, but nobody says not to eat apples because they weren't made for human consumption.