Chapter_30-_Nutrition_and_Digestion-1

Chapter_30-_Nutrition_and_Digestion-1 - Chapter 30 BIO 1002...

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Chapter 30 BIO 1002 3/13/2008 Chapter 30: Nutrition and Digestion I. Nutrition - A nutritionally adequate animals diet satisfies three needs: 1. Fuel (chemical energy) 2. Organic raw materials for biosynthesis (esp. carbon-based molecules) 3. Essential nutrients (substances that the animal needs, but cannot synthesis from any precursors on its own- must eat it to obtain it) - A nutritionally inadequate animal diet fail to satisfy the three basic needs we just covered: 1. Undernourishment- insufficient calories (energy) 2. Over nourishment- too many calories and too much stored fat 3. Malnourishment- a diet missing one or more essential nutrients - Energy in nutrients is measured in Calories (kcal= energy to raise the temperature of 1 Liter of water 1 degrees Celsius) - An “average” human body uses about 1,550 Calories/day - (5) Principal categories of nutrients: 1. Lipids : found in lipid membranes, etc.; including essential fatty acids - 9 calories per gram (a principle energy source) 2. Proteins : building blocks and enzymes; animals require 20 amino acids, including essential amino acids - 4 calories per gram (usually a secondary energy source, since the
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This note was uploaded on 09/22/2009 for the course BIOL 1002 taught by Professor Pomarico during the Spring '08 term at LSU.

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Chapter_30-_Nutrition_and_Digestion-1 - Chapter 30 BIO 1002...

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