Hot off the press!  Chocolate maker, Barry Callebaut, claims to be the first to manufacture a “no added sugar” chocolate on an industrial scale.  They use a solution made from Stevia plant extract which is between 100 and 400 times the sweetness of sugar with zero calories.

Stevia extract contains no artificial intense sweeteners and does not induce a laxative side-effect (there's good news!).  The product is still in the approval stages in some countries, and in the US it is currently has GRAS status for food applications.  (GRAS means Generally Recognized As Safe.)
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