Well, there's desperate and then there's desperate. There were reports of children disappearing during the Soviet famines of the 1930s and during catholic Siege of Sancerre (1572–1573) in France of the graves of dead being dug up so that the bone marrow from the bones could be consumed.
I remember reading an autobiography of a guy who survived the great famine in Ukraine in '33 (
http://en.wikipedia.org/wiki/Holodomor). Can't remember his name (something something-stky, if that helps).
Basically, he describes families exchanging first elderly relatives and later children, as "help" at the desolate farms. No helper was every visible, the families suddenly had meat for several weeks and neither family ever asked for their elderly relatives or kids back.
Also, people escaping cities to find work or food in the countryside disappeared every so often and the whole villages held a feast the next day.
In the appendix there was some statistics. Almost three thousand people were condemned in court for cannibalism after the famine.
It was a pretty good book, although I think the protagonist was one heck of a stoic eight-year-old orphan.
-jh