Most people use Whole30 diets to, as Fresh n’ Lean puts it, “reset their health” and get a fresh start. Basically, it’s used as a way to cleanse your system of unwanted contaminants before starting a new diet, fitness routine, etc.  It’s also used to narrow down foods you may have adverse or allergic reactions to. However, I would caution you to consult a dietician or other healthcare expert before starting any new diet, including Whole30.