Wellgard Apple Cider Vinegar Gummies  Ditto the genetic tests that claim to be able to tell you whether you’re better off on a low-carb diet or a vegan one. In a 2015 study, Segal and Elinav gave 800 men and women devices that measured their blood-sugar levels every five minutes for a one-week period. They filled out questionnaires about their health, provided blood and stool samples...