For today’s edition of Dear Mark , I’m answering three questions from a single reader who just read an article from Vice. The article makes pretty bold assertions about topics that have already received a good deal of attention here on the blog. First, are probiotics actually useless? A new study cited in the article seems to suggest so. Next, is your gluten-free diet killing you? That’s what the author of the Vice article says. And finally, have GMO foods been conclusively proven to be safe and indistinguishable from non-GMO foods? Is the debate, more or less, conclusively over? Let’s discuss: Mark, What are we to make of this article on Vice? It’s claiming that probiotics don’t do anything, gluten-free diets are potentially dangerous for people without celiac, and GMO foods have no downsides. Is it true? http://ift.tt/1W4yKPL Thanks, Skip The studies the article bases its arguments on are real, but the results aren’t as definitive or far-reaching as the Vice writer implies.