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Unformatted text preview: 1 C ARBOHYDRATE D IGESTION & A BSORPTION ( PG . 68-76) Lia M. Nightingale, Ph.D. Carbohydrates Simple Carbs Monosaccharides Disaccharides Complex Carbs Oligosaccharides Polysaccharides Sweet Sweet Sugars Saccharides or glycans MOUTH - DIGESTION Enzymes in saliva: Salivary -amylase randomly digesting (1-4) bonds in starch Reducing end Non-reducing ends STOMACH - DIGESTION Salivary amylase is denatured by stomach acid Carbohydrates are not digested in the stomach! STOMACH - DIGESTION Soluble fiber can form a physical barrier , not allowing sufficient exposure to digestive enzymes E Soluble fiber can swell in stomach, delaying gastric emptying (increases satiety ). SMALL INTESTINE - DIGESTION Pancreatic -amylase & brush border enzymes ( lactase, maltase, sucrase, isomaltase ) digest sugars into monosaccharides Glucose Galactose Fructose 2 CLINICAL CORRELATION: LACTOSE INTOLERANCE Lactase concentration is high in infants and may diminish with age Lactase deficiency causes lactose malabsorption Lactose goes to LI and is fermented to short-chain fatty acids & gas Prevalent in African Americans, Jews, Arabs, Greeks, & some Asians SMALL INTESTINE (SI) - DIGESTION Soluble fiber...
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