Jen ch 44 Flashcards
food security
all members of household have access to sufficient, safe, nutritious food to maintain healthy lifestyle
basal metabolic rate (BMR)
energy needed to maintain life-sustaining activities
resting energy expenditure (REE)
energy that individual needs to consume over 24 hrs to maintain all of its internal working activities while at rest
nutrients
elements necessary for the normal fct of numerous body processes
nutrient density
proportion of essential nutrients to the number of kilo-calories
carbohydrates
composed of carbon, hydrogen, and oxygen are the main source of energy in the diet (1 gram of carb = 4 kcal) AKA saccharides
monosaccharides and disaccharides
simple carbs found primarily in sugars
fiber
polysaccharide not broken down by the digestive system
protein
essential for building of body tissue in growth, maintenance and repair (4 kcal/g)
amino acid
simplest for of protein, hydrogen, oxygen, carbon, and nitrogen
nitrogen balance
achieved when the intake and output of nitrogen are equal
lipids
composed of triglycerides and fatty acids (9kcal/g)
water
makes up 60%-70% of total body weight
vitamins
organic substances present in small amounts in foods that are essential to normal metabolism
fat soluble vitamins
A, D, E, K stored in fat
hypervitaminosis
megadoses of supplemental vitamins
water-soluble vitamins
C and B - the body does not store so need to have in daily food intake
minerals
inorganic elements essential to the body as catalysts in biochemical rxns
macrominerals
daily requirement is 100 mg or more
microminerals
trace elements daily requirement is less than 100 mg
enzymes
protein like substances that act as catalysts to speed up chemical rxns
peristalsis
wave like muscular contractions
active transport
energy dependent
passive diffusion
doesn’t need special carrier
osmosis
movement of water through a membrane that separates solutions of different concentrations
pinocytosis
engulfing of large molecules of nutrients by the absorbing cell when molecule attaches to the absorbing cell membrane
primary site for absorption
small intestine
metabolism
Aggregate of all chemical processes that take place in living organisms and result in growth, generation of energy, elimination of wastes, and other functions concerned with the distribution of nutrients in the blood after digestion
anabolism
Constructive metabolism characterized by conversion of simple substances into more complex compounds of living matter
catabolism
Breakdown of body tissue into simpler substances.