Main source of energy derived from:
B i.e. GlycogenAcceptable Macronutrients Distribution Ranges (AMDR)Main source of energy in humans is carbohydrate. The primary role of dietary carbohydrate is to provide enegyQ.The carbohydrates are not essential nutrient, because the carbon skeletons of amino acids can be conveed into glucose by gluconeogenesis. However the absence of dietary carbohydrates lit ketone body production, protein degradation & gluconeogenesis.Recommended dietary allowance (RDA) for carbohydrate is set at 130 gm/day for adults & children, based on the amount of glucose used by carbohydrate dependent tissues, such as brain and RBC.Adults should consume 45-60% of their total calories from carbohydrate and added sugars represent no more than 25% of total energy.Very low carbohydrate diets, providing only 20 gm/day, but permitting unlimited consumption of fat and protein promote weight loss because of high energy (ATP) cost of gluconeogenesis. Since there is a continual demand for glucose, there will be a considerable amount of gluconegenesis from amino acids; the associated high ATP cost must then be met by oxidation of fatty acids.Glycogen is the only carbohydrate in optionsMacronutrientRange (deg/o of energy)KCI gmCarbohydrate (No less than 130gm/ day)45 - 65 Protein10-354Fat20-259- n-6 only unsaturated FA5- 10 - n-3 Polyunsaturated FA0.6-1.2 Carbohydrate45-654No less than 130 gm/day - Added sugars - Fiber in men : 38 gm - in women: 25gm Quality of protein : Protein digestibility corrected aminoacid Scoring (PDCAAS)SourcePDCAAS valueAninial proteinEggMilk11 Beef / Poultry /Fish0.82- 0.92 Gelatin0.08Plant proteinSoyabean1 Kidney beans0.68 Whole wheat bread0.40
Fat
Glycogen
Lactate
Acetone