Proteins
Proteins are vital structures and working material of all living things.
Examples antobodies
Some are working proteins.
Some are structural proteins
Examples: muscles, tendons, ligaments
General Information
About 16% of our body weight
smallest units are called amino acids.
Also known as building blocks of protein.
Energy= 4 cal/g
Contains which elements?
Hydrogen, Oxygen, Carbon, nitrogen.
Recycled by the body so, need less in amts. Compared to other macronutrients.
All amino acids have the same structure except for the "R" group which varies.
How many amino acids
In humans= 20 amino acids
In nature= Over 150 have been found in... plants, animals, fungus, single- celled organisms
Protein denaturation (Complex to simple)
In our 20 amino acids
nonessential
our bod can make from other amino acids
12
2 amino acids= dipeptide
Essential
Need to consume!!
8 EAA
If toddler or younger... 9 essentials
More than 2 amino acids= Polypeptide
Proteins in food
Complete protein
contains all 8 EAA
Most come from animal sources
Incomplete prtein
Are short 1 or more EAA
Come from plant sources
Can combine foods to make complete, known as complementary sources.
Examples: chickpeas and sesame, PB, Beans, rice
Describe the difference between complete and incomplete proteins.
Incomplete missing 1 or more essential AA's
Proteins
Body functions
Amino acids
Regulating
Structual
essential
Nonessntial
1st primary amino acids 
Second 
chewing, hydrochloric acid (in stomach), mixing + hormones in intestines, Enzymes, Marinades (acid + alcohol), heat, fire, mixing + cutting pounding.