sci241_week4_reading2

sci241_week4_reading2 - (Isabelle Rozenbaum/Age Fotostock...

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(Isabelle Rozenbaum/Age Fotostock America, Inc.) C H A P T E R 6 C O N C E P T S ± Both plant and animal foods provide protein. ± Proteins are made up of chains of amino acids folded into three- dimensional shapes. ± Amino acids that cannot be made by the body in amounts sufficient to meet needs are essential in the diet. ± Amino acids can be used to synthesize body proteins, to make nonprotein molecules, and to provide energy. ± Protein is necessary to allow for growth as well as to maintain structure and regulate functions in the body. ± Animal sources of protein are generally of higher quality than plant sources. ± Plant sources of protein can meet needs if complementary proteins are chosen. ± Well-planned vegetarian diets can meet nutrient needs and promote health. Are high-protein diets unhealthy? Does eating extra protein make your muscles bigger? Do you need protein supplements? Can you stay healthy eating a vegetarian diet? J u s tA T as t e
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Bicycling Magazine Meatless Power Carnivores May Be King of the Jungle, but Veggie Lovers Can Rule the Road By Selene Yeager April 2003—Back in the day, bleu steak (so raw it’s almost squirming) was a staple of the pro-cycling diet. But just as more Americans have embraced vegetarianism, so have more cyclists. “Vegetarians tend to have lower body-mass indexes, lower cancer rates and lower cholesterol levels than meat-eaters,” says Liz Applegate, Ph.D., consultant to the U.S. Olympic Cycling Team and author of the Encyclopedia of Sports and Fitness Nutrition . “They also tend to live longer. More athletes ask me questions about vegetarianism than any other diet topic. And they all want to know the same thing: Can I still ride as strong?” Veggie-chowers such as six-time Ironman champ Dave Scott and Tour de France stage winner Sean Yates prove that you don’t lose muscle when you go meatless. But you do have to eat smarter when you put the steak knife away. For more information on this article, go to www.bicycling.com/article/ 0,5073,5921,00.html?category_id ± 363. 155 6 Proteins and Amino Acids Both Plant and Animal Foods Provide Protein Animal Protein Intake Increases with Prosperity Different Protein Sources Provide Different Combinations of Nutrients Proteins Are Made of Amino Acids Each Amino Acid Has a Unique Structure Some Amino Acids Are Essential in the Diet A Protein’s Shape and Function Is Determined by Its Amino Acids Proteins Must Be Digested to Be Absorbed Amino Acids with Similar Structures Compete for Absorption Absorption of Protein Fragments Can Cause Allergies The Protein We Eat Provides Amino Acids to the Body Amino Acids Are the Building Blocks of Proteins Amino Acids Are Needed to Make Nitrogen- Containing Molecules Amino Acids Can Be Used for Energy or to Make Glucose Body Proteins Provide Many Functions Proteins Provide Structure Enzyme Proteins Speed Up Metabolic Reactions Proteins Transport Molecules Throughout Our Body Proteins Protect Us from Injury and Infection Proteins Help Us Move Some Hormones Are Proteins
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This note was uploaded on 12/03/2010 for the course SCI 241 taught by Professor Williams during the Winter '10 term at University of Phoenix.

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sci241_week4_reading2 - (Isabelle Rozenbaum/Age Fotostock...

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