Are you talking about total sugar or added sugar? They’re different.
Before fermentation, a drink can contain, say for example 13g of sugar per serving. After fermentation, yeast will have converted most of that sugar into alcohol and CO^2 . If the amount of remaining sugar is less than 0.5g per serving, the FDA considers it “sugar-free”. According to [this website](https://blog.packleaderusa.com/fda-compliance-considerations-for-your-kombucha-label), any sugar added *after* fermentation will need to be specifically labeled as “added sugar”.
TL;DR sugar in the drink before fermentation is gone from the final drink.
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