All foods and beverages we consume have constituents that our body can metabolize and utilize along with metabolic constituents that we cannot utilize. The small percentage of metabolites that cannot be utilized is known as ASH. This residual ash from our digestive process is either acidic or alkaline, and the pH of the ash may differ from the pH of the original food or beverage. Stored in fat, acidic ash accumulation in the body results in low cellular oxygen levels. Together these two conditions invite disease of all sorts. Like lemons, kombucha is acidic before digestion but produces alkaline ash.