Why is water kefir sometimes ok for diabetics to consume?
The bacteria and yeast produce enzymes that break down the sucrose (the double sugar that sugar is composed of) into fructose and glucose. Fructose is digested by the liver and does not spike the blood sugar of diabetics like sucrose or glucose. Because of the fructose, it makes this drink a lower GL. Also the added acetic acids and carbonation from the fermentation lower the GL as well. We’ve noticed and had people share that the best way for diabetics to consume water kefir is to do a secondary ferment with pure fruit juice (high in fructose) and a portion of the finished water kefir which results in a low-sugar (and low GL) beverage. You can read about secondary ferments here. It is not safe for all diabetics, and is ultimately up to you to determine how your blood sugar levels respond after consuming water kefir. ‘Ripening’ kefir can even further reduce the sugar content (but raise the alcohol and acids) if desired.