"Can vegans stomach the unpalatable truth about quinoa?," thunders the headline of a recent Guardian piece. Hard to say, but reality check: It isn't just vegans who enjoy quinoa. Like many occasional meat eaters I know, I've been eating it for years. Quinoa is also big among gluten-intolerant omnivores. So quinoa's truth—unpalatable or not—isn't just for its vegan fans to bear.So what is going on with this long-time staple of the Andes and newly emerged favorite of health-minded US eaters?First, the good. Quinoa is the grain-like seed of a plant in the goosefoot family (other members include spinach, chard, and the wonderful edible weed lambs