Cocaine for children

"Tiffany knew what the problem was immediately. She'd seen it before, at
birthday parties. Her brother was suffering from tragic sweet
deprivation. Yes, he was surrounded by sweets. But the moment he took any
sweet at all, said his sugar-addled brain, that meant he was not taking
all the rest. And there were so many sweets he'd never be able to eat
them all. It was too much to cope with. The only solution was to burst
into tears."

Terry Pratchett - The Wee Free Men.