Date sugar kind of dissolves, but it's also high fiber, so it has a thickening effect. Unfortunately when it comes to sweeteners, the only ways to really keep them healthy is to make sure they're combined with a source of fiber and antioxidants, to blunt blood sugar spikes and prevent inflammation. Natural low calorie sweeteners like Stevia might be an option, but it's not clear what their health impacts may or may not be either.