The word “kveik” comes from an Old Norse word that’s related to the English “quick,” as in “alive”—think the Quick and the Dead—rather than “fast.” The effect of yeast is to bring life to a brew or bread dough, making things bubble and rise. But the speed definition of “quick” would be just as relevant,…

The amount of beta-glucan fiber in just a dusting of nutritional yeast each day may be enough to change the course of our immune response to various pathogens, according to a study that put this substance to the test in a randomized, double-blind, placebo-controlled trial for the prevention of common childhood illnesses. The findings reflect…