The NYT says that toddlers who are picky eaters might suffer some health and growth setbacks as a result. Except when they don't.
And if it's encouraged or tolerated at a young age, picky eating habits can contiue to haunt a child as they get older. Except when they don't.
Confused? Basically, there's no science and few surveys, but most people think kids aren't eating their vegetables. Unless you count french fries.
There's some interesting/depressing stats, but the only real practical information I can see is:
Meanwhile, just stuff the kid full of Veggie Booty, which is made from all kinds of vegetables, including kale. The kid pounds that stuff.