Prebiotic soda brand Poppi is facing a lawsuit that claims the drinks may not actually provide any real gut health benefits. Eugene Gologursky / Stringer / Getty Images Soda is not good for you, but prebiotic sodas are: At least that’s what we’ve been told about Poppi, one of the best-selling functional drinks, alongside other brands like Olipop and Wildwonder. Poppi is touted as an...