Cow's milk is an unhealthy fluid from diseased animals that has a wide range of dangerous and disease-causing substances that have a cumulative negative effect on all who consume it. By a freak of nature it is identical between cows and humans. If that were true, the FDA has proven that breast feeding cannot work. Most folks suspect that butter is all fat.
Most folks have no concept of the just how much fat is in the rest of milk and dairy.
The USDA recommends 1200mg of calcium per day. Mother nature seems to suggest it should be one to one. That makes it VERY expensive water. Bacteria Cow's milk is allowed to have feces in it. This is a major source for bacteria.