It seems with the childhood obesity crisis our nation is facing researchers have begun to study the nutrition habits of preschoolers. We know that habits are being learned...formed during this time. Washington University is studying how to get preschoolers to eat more fruits and vegetables.
According to the research, it starts with the parents. Well, this seems pretty obvious but here is a nice article that summed several studies that shows how parents can really make a difference in their child's eating habits.
Parents, you are the most important role model for your kids. You decide what food is purchased, what the meal will be etc.
So here is a couple of suggestions:
Keep it simple, keep it fun. We want them to associate fun memories with fruits and vegetables, not bad experiences like "my mom got mad at me 'cause I didn't eat my vegetables.