Lecture8

Lecture8 - • Amount of each essential AA in a gram of...

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Is a High-Protein Diet Harmful? • Low in plant foods (fiber), vitamins, phytochemicals • Intake of animal protein increases risk for heart disease (high in saturated fat) • Excessive intake of red meat is linked with colon cancer • Glycans (carbs) from red meat and milk (mammalian protein not fish or chicker) get incorporated into human glycoproteins and stimulate inflammation leading to increase risk of carcinomas • Burden on the kidney to secrete excess urea • Increase calcium loss
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Figure 7.6
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Figure 7.7
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Figure 7.9
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Fig. 4.10
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Synthesis of Tyrosine Phenylalanine Tyrosine (Essential AA) phenylalanine hydroxyase (Nonessential AA)
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Protein Efficiency Ratio • Used by FDA to set standards for baby food • Compares the weight gained in a growing rat after 10 days or more eating a standard amount of protein Gram weight gain Gram protein consumed PER =
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Chemical Score of Protein
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Unformatted text preview: • Amount of each essential AA in a gram of protein in the food divided by an “ideal” amount for that essential AA (EAA) • The lowest AA is used for scoring that food mg of EAA per gm of protein Required mg of EAA per gm of protein Chem. Score = Extra Material Fig. 7.3 Functions of Proteins • Building blocks of body components • Maintain fluid balance • Contribute to acid/base balance • Building block for hormones and enzymes • Immune function • Gluconeogenesis • Energy yielding Protein Digestibility Corrected AA Score (PDCAAS) • Most widely used (on food labels) • Maximum value is 1.0 (= milk, eggs, soy protein) PDCAAS = Chem. Score x (~0.9-1.0) Range of digestibility Biological Value • Measure protein (AA) retention Nitrogen retained Nitrogen absorbed BV = X 100...
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This note was uploaded on 02/03/2009 for the course BICD 120 taught by Professor Crawford during the Winter '06 term at UCSD.

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Lecture8 - • Amount of each essential AA in a gram of...

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