This “secret” to healthy microwave popcorn is so easy and obvious you have to wonder if the food industry hasn’t conspired to keep the public ignorant all these years. Once you try it, you’ll never buy popcorn in those little folded bags again. The secret is this: Take a plain, brown-paper lunch bag, put a modest handful of un-popped kernels inside, roll down the top a couple of turns, put it in the microwave and nuke about three minutes on high. Voila! Beautiful, fluffy, air-popped corn with no trans-fats, no perfluorooctanoic acid (PFOA), no imitation flavors and no nasty diacetyl compounds — all of which are found in most brands of commercially packaged microwave popcorn.