When I was in school, there were obligatory milk breaks.  There was one girl in my class who could not have milk, so she was allowed to have whatever it was she had instead of milk.  Where do lactose intolerant children get the calcium they need for their bones?

Also, if a child is so poor his or her family cannot afford to feed them, what are the chances they'll complain of lactose intolerance?  I mean, I am not being a smart ass, I am really wondering what the numbers are.  It seems that dietary restrictions tend to show up more often in people who have access to a wide variety of foods.  They may be too hungry to complain about a stomach ache.  

"Talking nonsense is the sole privilege mankind possesses over the other organisms." -Dostoevsky