Psychologists say it's a mixture of genetics, acquired taste and peer pressure.
Click on the image to learn more. By Alison Krieg Zachary just sat down for a cheeseburger with ketchup. Instead, kids shun new and unknown foods, and can be downright nasty in their refusal to try them. Most children will go through picky eating phases where they're very wary of trying things that are new. As children become more aware of the world around them, they become pickier eaters.