Proteins Flashcards
large complex molecules comprised of amino acids (carbon, hydrogen, oxygen, nitrogen)
proteins
what is a primary source of nitrogen in our diets?
protein
amino acids that cannot be produced in our bodies and must be obtained from food
essential amino acids
amino acids that can be made by our bodies
nonessential amino acids
contains sufficient amounts of all 9 essential amino acids; considered a “high quality” protein
complete protein
does not contain all the essential amino acids; not sufficient for growth and health, and is considered a “low quality” protein
incomplete protein
foods that are used as dietary sources of complementary proteins
complementary foods
where does protein digestion begin?
in the stomach
an enzyme that breaks down proteins into short polypeptides and amino acids
pepsin
pancreatic enzyme that digests proteins into a mixture of tripeptides, dipeptides, and amino acids
proteases
what releases the amino acids (breakdown of proteins) into the bloodstream?
mucosal cells
what 4 factors does proper protein intake depend on?
body weight
activity level
age
health status
what is our RDA of proteins?
12-20%
what are 4 risks of too much protein in a diet?
high cholesterol
heart disease
bone loss
kidney disease
a disorder caused by inadequate intake of protein and energy
protein-energy malnutrition