The typical diet doesn't include a whole lot of zinc - rich foods. (blog.bulletproof.com)
Maybe he ate plenty of meat, and thus lots of zinc, and that kept his inflammation down and meant that oily skin wasn't a problem. (supernaturalacnetreatment.com)
You've probably been told that bread, pasta, and similar foods contain lots of zinc, which they do, but it's bound up in a mineral chelator called phyctic acid that prevents your body from digesting most of it. (supernaturalacnetreatment.com)