Corn is not Paleo, so we can’t include popcorn. Yes, most movie theaters smother it in coconut oil (which is certainly Paleo), and some even use real butter, but unfortunately, that does not do much to eliminate the negative effects of the corn.
Paleo and Phytic Acid
Popcorn still contains the phytic acid found in corn, which binds to minerals and prevents our bodies from absorbing them, so despite the fact that corn may have some nutrients, we are unable to access them. This can also cause long-term nutrient deficiencies.
Not Such a Good Source of Antioxidants
Popcorn has gotten some praise for being a good source of polyphenols (a type of antioxidant), but those are located in the hull of the kernel: the brown, flaky part that gets stuck in our teeth and our throats. It’s the part many people spit out or avoid altogether. It doesn’t do us much good if we can’t eat it.
Paleo and Fiber
The rest of the kernel often gets praised for being high in fiber, but it’s insoluble fiber. That means it’s the stuff we can’t digest and our gut bugs can’t eat. It just passes right through us to bulk up our stool and there’s not much health benefit to that.
Mark Sisson addressed the issues of popcorn in this post.