We had a doctor asked us this question almost 2 decades ago. At that time my answer was, I don't know let's see. So the doctor drank his zero sugar propel every day while his wife drank water only the interesting result at the end of their transformation. They both obtained intracellular hydration and outstanding results. Since that time we have become advocates of realizing that as long as you are getting in the recommended water per day, you may absolutely drink a zero sugar propel on the protocol.