Nutrition Concepts_Collison_Date_031810

Nutrition Concepts_Collison_Date_031810 - Chapter 7...

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. Energy Balance -When energy intake exceeds energy output, there is a gain in weight -Excess energy can come from protein, fat, or carbohydrate -Fat is the most efficient in being stored as fat Feasting- Excess energy - Excess protein is converted to fat but this is inefficient and indirect. Its priority is other roles. - Excessive carbohydrate is converted to fat but this is inefficient and indirect. Its priority is glycogen stores. - Excess fat is efficiently converted to fat The transition from feasting to fasting draws on reserves- the body draws on glycogen and body fat stores. Glucose is needed for the brain; Protein meets glucose needs - The body then shifts to ketosis (Atkin’s diet- lose weight really fast because of loss of water and muscle. Rarely maintain weight loss when on this diet) - Ketones are produced when glucose is not available - Ketosis causes a suppression of the appetite - Slowing of metabolism Symptoms of starvation: - Muscle wasting - Decreased heart rate, respiratory rate, metabolic rate, and body temperature - Impaired vision - Organ failure - Decreased immunity - Depression, anxiety, food-related dreams Pre-test with answers 1. Which of the following metabolic reactions occurs when a cell uses energy? ATP releases a phosphate and becomes ADP 2. Which is not an aspect of glycolysis? It is irreversible. It DOES generate ATP, it occurs in the absence of Oxygen 3. Which compound cannot be formed from fatty acids? Glucose. It can be formed from ketones, acetyl CoA, and carbon dioxide. 4. Which leads to the production of urea? Oxidation of amino acids 5. During the 2 nd and 3 rd days of a fast, what energy source provides about 90% of the glucose needed to fuel the body? Ketones 6. What % of weight loss during starvation is lean body mass? 50% 7. Which is a feature of aerobic metabolism? Energy is produced more slowly
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Nutrition Concepts_Collison_Date_031810 - Chapter 7...

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