I'm enthusiastic about milk, but why is it so good for us?
If you read Starting Strength, you'd know. To summarize, it has everything baby calves need to grow strong, which is also similar to what humans need to grow strong. Lots of protein, along with some sugar and lots of vitamins and minerals.
I might add, if the lactose gives you grief, invest in some kefir grains and ferment it out. You get some extra b vitamins and folate in the exchange. Plus it's hella tasty.
I'll just add that, in my experience, milk and coffee do not mix well. YMMV.
He recommends drinking a gallon of milk a day, aka GOMAD.
go crzy
To wit: GOMAD + barbells got me from 205 lbs to 305 lbs body weight.