NTS 135 Lecture Notes - Lecture 3: Blood Sugar, Galactose, Starch
Document Summary
3/24/2017 4:27:00 am digestible vs indigestible carbs (fiber: gastrointestinal health) Our primary source of energy (130g/day or 45-65% of total energy intake) Glycogen stores/blood glucose can meet energy needs for day of moderate activity. Cns depends (low carb reserves, 10-15 min) on min-to-min supply of glucose from blood. Occur naturally in plant foods: starch, sugars photosynthesis: plants transform the sun"s energy into the stored fuel of carbs (quick energy food) Measures relative effect of different carb-containing foods on blood glucose levels refined = high gi unrefined = low gi. Under extreme conditions: fat oxidized at excessive rates. Glycogen stored in cardiac muscle important for emergency source of contractile energy. Nondigestibles found in whole grain cereals, fruits, veggies, legumes: dietary: nondigesible carbs + lignin functional: nondigestible polysaccharides. Starch and sugar into glucose: mouth: salivary amylase, pancreatic secretions: amylase to starch + maltose intestinal secretions: sucrose, lactase, maltase.
