CHEM 181 Lecture Notes - Lecture 4: Meta-Analysis, Olestra, Histidine

• School: McGill University
• Department: Chemistry
• Course: CHEM 181
• Professor: David Harpp

Document Summary

Function of proteins: growth (major issue children), deficiency = kwashiorkor, bloated stomach, reversible if caught in time, tissue maintenance, enzymatic processes (digestion, sources: milk, meat, eggs. Eggs: transparent portion turns white as protein denatures and water is driven off. Complete/incomplete proteins: complete proteins: in meat, fish, eggs and milk, have the balance of required amino acids, need most of tyrosine and phenylalanine, least of tryptophan. Incomplete proteins: in wheat, corn, rice: deficient in some components, very short on lysine, a little on threonine, leucine and valine. Energy consumption: need equivalence of about 6 barrels of oil energy to bring cow to market. 1. 5 :1: soy: 220m tons world-wide --15m eaten and 144m fed to animals. In 1/3 for a hectare, could get 54kg soy protein or 3 kg beef would result from feeding that soy to cattle: very large increase in meat consumption for asian countries (china)