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We get this question a lot at Vegan Wines. The short answer is this: The wines in our inventory have no added sugar. Our wines, like all wines, do contain the naturally occurring sugars that come from grapes. It's the sugar in wine that is used to create alcohol through the process of fermentation. The yeast "eats" and metabolizes the sugars into alcohol (and carbon dioxide). So basically, you need to have sugar in wine... if you want to have alcohol. The riper the grape, the more sugar in the fruit. The juice of wine grapes can start out intensely sweet, but fermentation uses up that sugar as the yeasts feast upon it. The natural sugar from the grapes that remains after the fermentation process is complete is known as "residual sugar." That sweetness does not come from corn syrup or granulated sugar, as many fear.
Inside the grapevine--or any plant--the primary energy source is sucrose (in animals, it's glucose). Sucrose is a combination of glucose and fructose molecules. As the grape ripens, this breaks down, so fermentation always begins with equal parts glucose and fructose--two types of naturally occurring sugars you've probably heard of. During winemaking, if the yeast converts all of the grape sugars into alcohol, this will result in a dry wine. However, sometimes not all of the sugar is fermented by the yeast, which means there will be some sweetness left over. Riesling is a great example of a well-known wine that contains residual sugar. In some cases, residual sugar can be used to mask lower quality grapes, particularly in cheaper wines, however, there are plenty of amazing bottles of high-quality wine that are made in sweeter styles.