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Digestion. Sucrose digestion does not begin until the sugar reaches the small intestine. Your body cannot absorb polysaccharides as is, so it must first break sucrose down into its component parts.ucrose, commonly known as table sugar, consists of one molecule of glucose and one molecule of fructose.
  Starch digestion begins in the mouth. As food does not remain long in the mouth, only a little starch is digested by salivary amylase to maltose. No digestion of carbohy â¦ drates occurs in the stomach; only proteins are digested in the stomach.In the small intestine, starch is digested by pancreatic amylase into maltose, which is digested by maltase into glucose. Lactose is digested by lactase into glucose and galactose.Sucrose is digested by sucrase into glucose and fructose.The end products of carbohydrate digestion are simple sugars (glucose, fructose, and galactose) which can be absorbed. Cellulose is not digested in the humans' gut.actose is digested by lactase into glucose and galactose. Sucrose is digested by sucrase into glucose and fructose.The end products of carbohydrate digestion are simple sugars (glucose, fructose, and galactose) which can be absorbed.