NS 1150 Lecture 16: Lecture16

• School: Cornell University
• Department: Nutritional Science
• Course: NS 1150
• Professor: David Levitsky

Document Summary

Number 1 nutritional problem in the us. Increasing disproportionally: black increased most, latino, then white is least. In college, you stop growing in height, but continue in weight: most people get obese around 20. Change in weight=change in energy intake-change in energy expenditure. Indirect calorimetry: calorimetry-measuring calories, measure gases (oxygen consuming, co2 expelling, antoine lavoisier c. i. Used guinea pigs in a cage with controlled air supply. Wanted to measure the heat they gave off. Also measured amount of oxygen going into the chamber and co2 given off. c. ii. 1. Found that ratios between co2 and o2 and heat produced is same whether burning something inanimate like candle or live animal c. iii. Vitalism- idea that there is something special in life that is in nonlife. Rq= ratio of carbon dioxide blown off vs oxygen consumed= (6co2)/(6o2)=1 means you"re burning carbohydrate (yields certain amount of energy (respiratory quotient) 1 mol+80 moles o2= 56 moles of co2+h2o +8480 kcal.