Soy has become a controversial topic in the last few years, with some people demonizing it and others saying it's healthy. According to Shape magazine, the evidence is mixed: "for every health benefit of the complete plant-based protein source, you'll also hear of a potential detrimental effect… however, because soy products come in such a wide variety — whole soy, fermented soy, soy protein isolate, and others — confusion continues to ensue." While whole soy (such as tofu) and fermented soy (such as miso), are generally believed to be healthy, soy protein isolate seems to be the biggest offender.