NUSC 1165 Lecture Notes - Lecture 5: Nitrogen Balance, Model Organism, Osteoporosis
2 Feb 2019
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Document Summary
Used to learn more about how nutrients function and to evaluate the relationships among nutrient intake, levels of nutrients in the body, and health. Involves studying whole organisms (humans or animals) or cells. The nutrient is eliminated in the diet until deficiency when symptoms appear, nutrient is added back to the diet to a level which symptoms are eliminated (i. e. , calcium and osteoporosis) Compares the total amount of nutrient that enters the body with the total amount that leaves the body (nitrogen balance) Nin - animal proteins, plant proteins, amino acid supplements. Ideal animal model: similar metabolic and digestive processes. Cows: digestion of food in four stomach-like chambers. Pigs: similar digestive processes compared to humans. Inexpensive, short life spans, reproduce quickly, and show the effect of nutritional change rapidly. Scientists must be specific in choosing the animal. Rats: more resistant to heart disease compared to humans. Extracted from humans or animals or grown in the laboratory.
