With Halloween approaching, what better time to learn a few kernels of truth about a favorite fall treat? Candy corn has been made with the same recipe — containing sugar, corn syrup, and marshmallow — by the Jelly Belly Candy Company since around 1900. One serving (about 30 pieces) has 140 calories, the equivalent of three miniature Hershey bars. The National Confectioners Association reports that more than 35 million pounds were manufactured in 2005, amounting to almost 9 billion kernels.