As a nation, we’ve wisened up on our nutrition knowledge. Fats aren’t the devil—nor are they equal. Avocado, good. Mayonnaise, not so good. And for the most part, you can spot the foods that are pretty terrible for you: fast food fries, bakery confections, anything at the movie theater. But last week, in a now-viral talk, Karin Michels, Ph.D. , a professor at Harvard’s T.H. Chan School of Public Health added a more unsuspecting item to the blacklist: coconut oil. In the talk, aptly named “Coconut Oil and Other Nutritional Errors,” Michels refers to coconut oil as “pure poison” and deems it “one of the worst foods you can eat.” Her problem with the “healthy” oil? Its sky-high fat levels, more than 80 percent of which is saturated fat . That’s what beef, butter, cheese, and dairy products are packed with, according to research from Nutrition Reviews . Comparatively, butter is about 63 percent saturated fat; beef, 50 percent, and pork lard, 39 percent, per the American...