Is kvass healthy?

Could you elaborate on the potential health benefits or drawbacks of consuming kvass? As a fermented beverage, does it contain any beneficial probiotics or nutrients? Are there any specific health conditions that might make kvass consumption inadvisable? Additionally, are there any concerns regarding the sugar content or alcohol content in kvass, and how might these factors impact its overall healthfulness? Ultimately, is kvass a healthy choice for most individuals, or does it depend on individual circumstances and consumption habits?