As much as I love milk, I have been cutting down on fresh milk consumption for some time, because I want to reduce my protein intake. Trying to do the same for carbohydrates, but I am a carbo junkie - can't live without rice and noodles. =p
Anyway, if you google around for cow's milk, you may come across many articles that downplays the importance of cow's milk.
I will summarise some of the findings here.
(1) Any mucus-forming food, dairy being at the top of his list, is poison.
(2) A newborn's digestive system that is not yet developed is ill-equipped to handle milk protein. That's why many infants display many negative symptoms (eczema for example) after consumption of cow's milk.
(3) Scientists are finding correlations between milk and heart diseases, obesity and breast cancer (and people actually wonder why these diseases are so prevalent).
(4) While advertisements stress on how much more calcium their milk has, what they didn't tell you is the low bioavailability - cow's milk can have tons of calcium but they are in a form that is not easily absorbed by the human's body. So you should get your calcium by consuming leafy vegetables and beans (and supplements, if you are into it) instead.
(5) Cows eat grass. And ever wonder how some cows (and the grass) grow so fast and "healthy"? Steroids, stabilisers, hormones etc... Chemical milk, anyone?
And if you are still not convinced, someone written a book called "Don't drink your Milk! - New Frightening Medical Facts about the World's Most Overrated Nutrient".
All in all...
If you are a cow, then cow's milk are for you!
Else you might want to consider soya bean milk, which has no cholesterol and little saturated fats, contains isoflavones (which are antioxidants) and won't cause any milk allergy/lactose intolerance.
About the Author: Shingo T has nothing against cows, other than the enormous amount of greenhouse gases (methane) that cows produce when they fart.