I, too, was very concerned about the sugar content of kombucha.
The sugar used to make kombucha is devoured by bacteria and yeasts of the SCOBY. According to a Cornell study, kombucha that was started with 100 grams of sugar per liter had 4.8 grams of sugar (now as glucose) at the end of 9 days of brewing.
My kombucha usually takes more than 10 days to brew; occasionally up to 21 days, so I am guessing the Cornell study measured rather sweet kombucha. Even so, after the kombucha has brewed 9 or however many days, most of us bottle it. Once bottled, the yeasts that thrive without oxygen compete for the remaining glucose. In devouring it, fizz is formed--to the delight of the home kombucha maker. The longer it goes through this secondary fermentation in the bottle, the less sugar the finished product contains.
Those worried about sugar can measure the acidity of their kombucha to be certain that it is not too sweet. Also, I read that acidic foods and fermented foods reduce blood glucose levels, apparently by slowing the rate of sugar absorption--something to google. Kombucha is fermented and also acidic, being harvested at a pH of about 3.2.
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