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nslecture27notespartI - Lecture 27 exercise does Not lead...

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Lecture 27: exercise does Not lead to appreciable weight loss Protein Balance: Difference b/w amount protein you take in and protein you excrete - amount of nitrogen and amino acid coming in / amount of nitrogen leaving - Positive Protein Balance: -growth (but most people eat too much protein) -pregnancy (average consumes far more protein than they require =exercise that are necessary to build protein, such as muscle building (end product muscle growth) - eating more than 10% calories from protein : unnecessary Events that cause negative protein balance -dieting (caloric restriction): gluconeogenesis → don't have enough energy to maintain blood glucose so body breaks down protein to obtain glucose (also lose lean body mass ) -stress causes adrenal cortex to release corticoids that break down the protein that are used for energy =illness causes lack of movement which causes break down of muscle tissue (lose protein in that muscle tissue) -inactivity: causes reduction in mass (not using muscle makes you lose tissue but its recovered) Dave's Dietary Delusion Dr. Atkins -High Protein/Low Carb Diet instead of 55% Carb, 15% Protein, 30% Fat Daily Reference Value; Atkins said: 5% Carb, 35% Protein, 60% Fat -consume as low carb intake as possible -Dr. Atkins pushed low carb so much: ketosis , ketone sticks -study: did find significant weight -BUT: n=41; started out with 200+ -Mean Weight Loss Achieved from 30 published studies: 6.5-7 Kg Why do you Lose weight from High Protein Diets 1. In order to get rid of all these amino group, because you're consuming too much protein; liver takes nitrogen group off amino acids to kidney to get rid of it; but in order to get rid of it it requires sodium SO you lose body sodium 1. lose body sodium – lose water 2. inhibition of appetite 1. high blood amino acid concentration (inhibits appetite) 1. leads to delayed gastric emptying 2. reduction in choice of food (total intake suppressed) 3. No evidence that are effective in the long run 4. Might be Hazardous 1. consuming high protein causes Ca loss from bone 1. losing Ca – facilitate osteoporosis? 2. May be responsible for chronic renal failure 5. Can be used as one of several techniques to reduce daily intake
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Mad Cow Disease: -deterioration and brain disfunction -disease caused by prion protein (PRP) -really prevalent in brain -tissue attached to membrane in the brain w/ prion (PRCP) protein -prion exists on the membranes in a folded manner
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