Reason: fruit corn calories are high, sweet, is due to fruit corn endosperm in the water-soluble polysaccharide content is high and starch content is low, in the fruit corn to control starch synthesis of a series of genes, there is one or several genes have undergone a natural mutation, in a state of purity recessive, cut off some of the reductive sugar to starch conversion process, resulting in fruit corn compared with ordinary corn sugar content is high, and the sugar content is high, and ordinary corn. And the calories of sugar are higher than the calories of starch.