The Lie: Eat your vegetables.  They’ll make you grow up strong.

The Truth: They have nothing to do with your strength or lack thereof.  They’re marginally related to your “growth,” inasmuch as the absence of basic nutrients may stunt it, but you’d probably be fine eating pretzels and string cheese all day as long as you took your vitamins.

I’m inclined to tell my kids the truth on this one, but I’m concerned that “your vegetables contain magnesium, which promotes enzyme health” doesn’t have quite the same ring to it.