Last week’s post on coffee generated lots of questions. Today’s Dear Mark will answer some of them. First up is a two parter exploring whether L-theanine can make coffee work even better than it already does and if pre-ground coffee beans are lacking in the polyphenol content. Second, is coffee bad for your bones? It’s “common knowledge” that caffeine leaches calcium and inhibits absorption of it, but how true are the claims? And finally, caffeine can increase insulin resistance. What about coffee? Is this a problem for people following the Primal eating plan?