Just calories really. And if it's real butter it could be cholesterol issue. And if it's margarine it could be a transfat issue. I personally love buttered popcorn, but you know, everyone has their thing.

Popcorn is an amazing food. I love popcorn. It's fun to plug in the air popper and even in this age of technology my kids think it's pretty awesome to watch all the popcorn pop. I remember how fun that was when I was a kid.