I think our bodies especially that of children, know what they need until we train it out of them. If I take something to work for lunch that I know is disgustingly bad for me, I can look forward to eating it all morning. BUT when I sit at the table with someone eating a colourful, healthy salad, my body says that's what it wants not the left-over carby pizza.
Milk does taste disgusting to me alone, but I do like it in my coffee or tea. The problem with it, is it then mitigates all of the good in the coffee or tea. *sigh* I'm working on it...