carbohydrates athletes are not the only people who need carbohydrates. everyone needs them....
TRANSCRIPT
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Carbohydrates
• Athletes are not the only people who need carbohydrates. Everyone needs them.
• Carbohydrates are the sugars, starches and fibers found in foods. They are made up of carbon, hydrogen, and oxygen.
• There are two general types of carbohydrates: simple and complex.
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Photosynthesis
• Plants convert energy from the sun into glucose
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Sugars and Their Sources
• Fructose- fruits and honey
• Glucose- blood, grapes, corn
• Mannose- eggs
• Galactose- animals and humans
• Sucrose- table sugar
• Maltose- malted grains
• Lactose- milk
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Monosaccharides vs. Disaccharides
• Monosaccharide- a sugar containing one basic molecule
• Ex. Fructose, glucose, mannose, galactose
• Disaccharide- two monosaccharides joined together
• Ex. Sucrose, maltose, lactose
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• Hydroxyl group- an oxygen atom and a hydrogen atom bonded together
• Ribose- a special sugar that contains only five carbon atoms and is the building block for ribonucleic acid RNA
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Hydrolysis of Sugar
• Hydrolysis is a process where a large molecule, such as sugar, is divided into smaller parts by adding water
• Hydrolysis is used by the body to digest disaccharides in food
• Sweetened drinks are not as thirst quenching as water because the water is being used to break down the sugars
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Conditions for Hydrolysis
• 1. The presence of an enzyme to set off the reaction. Different enzymes hydrolyze different sugars but all the enzymes end in –ase. Ex sucrase for sucrose
• 2. The addition of an acid
• 3. The addition of heat
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Supersaturated Solutions
• A supersaturated solution is one that can hold more solute at a given temperature than it normally could
• Solvent- the liquid in which something is dissolved, ex. water
• Solute- the substance that is being dissolved, ex. sugar
• Solubility- the ability of a solute to dissolve in a solvent
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Caramelization
• The changing of sugar into a brown liquid when it subjected to high or prolonged heat
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Nutritional Value of Sugar
• All sugar types produce 4 calories per gram when they are digested
• Glucose is the form of sugar that the body uses
• Glucose that is not immediately needed is converted to glycogen, multibranched chains of glucose
• 2/3 of glycogen is stored in the muscles and 1/3 is stored in the liver
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Nutritional Value of Sugar
• When the body needs energy, glucose molecules break off of glycogen stores and are used as energy
• The average U.S. diet provides about 18% of calories from sugar added to food
• Registered dieticians recommend that this percentage be reduced to no more than 10% of calories from added sugar
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Health Concerns Related to Sugar
• Dental caries or tooth decay is caused by acid damaging tooth enamel
• Bacteria that live in the mouth feed on sugar and produce a sticky film called plaque
• Sugar and other carbohydrates can cause tooth decay
• Reducing sugar intake, brushing, flossing and having regular dental cleanings will reduce plaque buildup and tooth decay
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Health Concerns Related to Sugar
• Diabetes Mellitus- the body’s inability to move glucose from the bloodstream to the cells
• Insulin- a hormone produced by the pancreas which allows glucose to move into the cells to provide energy
• People with diabetes either don’t produce any insulin (type I) or their bodies are resistant to it and do not recognize its presence (type II)
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Health Concerns Related to Sugar
• Weight gain is caused when more calories are consumed than are burned off by the body
• All excess calories, including from sugar, are stored in the body as fat
• Sugar consumption should be in moderation since foods high in added sugars usually provide few other nutrients