I should add that I raise my mealworms in organic oat bran and feed organic carrots, cabbage, potato, squash, and occasionally apple or pear. So if there is a veggie that could harm the gecko via the mealworms, I'd like to know.
I avoid feeding them avocado and onions as these are toxic to birds and I don't want to risk the birds that eat my mealworms (not that I'm sure they would even eat this if offered) but being too safe never hurt anything