If there is one food group that kids tend to turn their noses up at, it's vegetables. Veggies—particularly green ones—have a bitter taste, which in hunter-gatherer times, often signaled "toxic" or poisonous.
Ever notice yourself wandering into the kitchen, opening the pantry, and grabbing a handful of crackers or cereal—without even noticing what you're doing? Or do you ever catch yourself eating chocolate chips out of the bag when, really, you were going to the kitchen for a drink of water instead? This happens to all of us.