nutrition mid term Flashcards
Describe food
products derived from plants or animals that can be taken into the body to yield energy and nutrients for the maintenance of life and the growth and repair of tissue
what are the 11 factors that influence food choice
- personal preference/taste
- habit
- ethnic heritage or tradition
- social interactions
- availability/ convenience- economy
- positive/ negative associations
- emotional comfort
- athletic performance
- values
- body weight and image
- nutrition and health benefits
What is a therapeutic diet
a diet ordered by a physician as part of treatment for a disease or clinical condition, or to eliminate, decrease, or increase specific nutrients in the diet
What is: a diet ordered by a physician as part of treatment for a disease or clinical condition, or to eliminate, decrease or increase specific nutrients in the diet
therapeutic diet
what is another name for therapeutic diet
medical nutrition therapy
what is another name for medical nutrition therapy
therapeutic diet
what is: a chemical substance obtained from food and used in the body to provide energy, structural material and regulating agents to support growth, maintenance and repair of the body’s tissue
nutrient
what is a nutrient
a chemical substance obtained from food and used in the body to provide energy, structural material and regulating agents to support growth, maintenance and repair of the body’s tissue
what two forms are nutrients found in?
organic
inorganic
what is a macronutrients
required in large amounts because they provide the body with energy in the form of calories
what is a calorie
food energy is measure in kilocalories (kcal)
one calorie is the amount of heat necessary to raise the temperature of 1 kilogram of water 1 degree Celsius
what: required in large amount because they provide the body with energy in the form of calories
macronutrients
what: food energy is measure in kilocalories
one calorie is the amount of heat necessary to raise the temperature of 1 kilogram of water one degree Celsius
Calorie
how many calories in a gram of carbohydrates
4kcal
what are examples of carbohydrates
simple sugars, fibre and starches
bread pasta rice cereal milk fruit
how many calories are in a gram of protein
4kcal
what are some examples of protein
milk eggs legumes gains animal products
what is protein composed of
compounds composed of carbon, hydrogen, oxygen and nitrogen arranged into chains
how many calories per gram of fat
9kcal
what is fat determined by
a family of compounds that are insoluble in water
fats are solid at room temperature while oils are liquid
what are the three diet recommendations?
variety
moderation
wholesomeness
what is a great source of: B vitamins, fibre and carbs
Grains and starches
what is a great source of: fibre, carbs, water soluble vitamins and potassium
Fruits and Vegetables
What foods provide amino acids to the muscles
protein
what can simultaneously be a source of saturated fats
proteins
what is a source of: calcium, phosphorus, B vitamins and protein
Dairy
DRI
Dietary Reference Intake
-set of nutrient intake value
EAR
Estimated Average Requirements
-estimated to meet about 1/2 population
RDA
Recommended Dietary Allowance
-intake meets (97-98%) of healthy individuals
AI
Adequate Intake
-empirical method when RDA is unknown
TUL
Tolerance Upper Level
-max intake of a nutrient without risk
Harris Benedict Equation for men
66.5+(13,75 kg) + (5.003 * cm) - (6.775age) *AF *SF
Harris Benedict Equation for Women
655.1 + ( 9.563* kg) + (1.850cm) - (4.676age) AFSF
What is the acceptable range for CHO, fat and protein
CHO- 45-60%
Fat-20-35%
protein 10-35%
four main uses for nutrition facts
- easy comparison
- Look for specific nutrient
- special diet
- informed decisions
Three steps to reading a label
step 1: look at the amount
step 2: read the DV %
step 3: choose
Nutrient Claim:
Free
none or hardly any of this nutrient
nutrient claim:
low
a small amount
Nutrient Claim:
reduced
at least 25% less than a comparable product
Nutrient claim
light
reduced in fat or calories
Nutrient Claim:
Source
contains a significant amount of the nutrient
Nutrient Claim:
high or good source
contains a high amount of a nutrient
Nutrient Claim:
very high or excellent source
contains a very high amount of the nutrient
Canada’s Food guide message
choose foods with none or little added sugar, fat or salt
and select lean meats
What are the 8 stages of digestion
- mouth
- salivary glands
- pharynx
- esophagus
- stomach
- small intestine
- large intestine
- rectum
what is on the tongues surface covered with taste buds and taste pores
papilla
what does salvia contain
99,5% water
electrolytes [ sodium chloride, bicarbonate, potassium]
protein [ enzyme, mucus and lysozyme]
function of salvia
moistening and lubricating food
initiating carbohydrate digestion
antibacterial protection
acts as a buffer
approx. how many times do we swallow a day
600
what are the four stages of the swallow
- oral preparatory phase
- oral phase
- pharyngeal phase
- esophagus phase
what is involved at the oral preparatory phase
food chewed and mixed with saliva
what is involved at the oral phase
voluntary movement of bolus to back of oral cavity
what is involved at the pharyngeal phase
bolus directed to esophagus, uvula seals off nasal cavity
what is involved in the esophageal phase
autonomic; sphincter closes and breakdown resums
what are the four layers of the esophagus
- inner layer
- submuscosa layer
- muscular layer
- outer layer
what are the two sphincter of the esophagus
upper esophageal sphincter [ pharnygoesophageal ]
lower esophageal sphincter LES
where is food stored in the stomach
the upper portion
what is the semiliquid substance in which food is converted by gastric secretions
chyme
what are the two types of gastric digestion
mechanical digestion
chemical digestion
What does GERD stand for
gastroesophogeal reflux Disease
what is GERD
incompetence of LES; greater pressure in esophagus therefore food has the tendency to travel upwards.
what are the factors that decrease the pressure differential from the esophagus and the stomach in individuals that have GERD
- increase in gastrin, estrogen, progesterone
- hiatal hernia or sclerosis
- smoking
- medications use [ dopamine, morphine]
- specific foods
symptoms of GERD
difficulty swallowing
heartburn
increases salivation
belching
treatment strategies/ goals for GERD
- increase LES competence
- decrease acidity of gastric contents [ use of medication and nutrition therapy]
- improve clearance of esophagus
What are some symptoms of Dysphagia
CVA, Parkinson’s disease, stroke, MS, muscular dystrophy, Huntington’s disease, chemotherapy
What is a common side affect of dysphagia
aspiration where oropharygeal contents are inhaled into lungs aspiration pneumonia secondary to bacterial overgrowth
what is a treatment for dysphagia
eating thinker liquid foods so there is time for the body to react and digest the food slower, and allow for the epiglottis to properly direct the bolus
what are the three main land marks of the small intestines
duodenum
jejunum
ileum
what stimulates the release of pancreatic and gall bladder secretions in the small intestines
cholecystokinin
gastrin
secretin
how does the pancreatic juices enter the small intestine
pancreatic bile ducts
what are the two aspects of the pancreatic juices
bicarb
enzymes
what does a bicarb do
neutralizes the pH
what does the enzymes in the pancreatic juices do
- protein breakdown: trypsinogen, chymotrypsinogen, procarboxypeptinases and elastase
- carbohydrate breakdown: amylase
- lipid breakdown: pancreatic lipase and colipae
what kind of contraction is peristalsis
longitudinal so it makes bulges
what kind of contractions is segmental
circular muscle. creates a pinch
what are on the folds of the small intestines
villi and on that microvilli
what are the three ways of nutrient absorption
- simple diffusion
- facilitated diffusion
- active transport
Three main areas of large intestines
ascending, transverse, descending
what are the segmentations of the large intestines called
hustration
what are the small sacs on the large intestines called
hustra
what does the hustra have in the sacs
chyme as it mixes with the colon secretions
what is propulsion
alternating waves of relaxation and contraction of smooth m.
what is mass movement
significant contraction of a large portion of intestinal contents along colon
what is defecation
rectum relaxes the anal sphincter
How long does absorption take to start after the food is consumed
4 hours
When you have celiac disease what layer of the intestine is damaged
mucosa layer
what is the treatment for celiac disease
limit gluten in diet
what does carbo mean
carbon
what does hydrate mean
water
what is the primary nutrient for the brain and nervous system
carbohydrates
is CHO a high or low density source of energy
low
what is a complex carbohydrate
long chains of sugar units arranged to form starch or fibre
what is the process called that plants create CHO
photosynthesis
what are the two components in which glucose is created by
CO2 and H2O
what is a simple sugar
basic sugar molecule contains 6 carbons with oxygen and hydrogen
what is a monosaccharide
single sugar unit
what is a disaccharide
double sugar unit
what are the three types of monosaccharide’s
glucose
fructose
galactose
where is fructose found
fruits
where is galactose found
milk products
what are the three disaccharide’s
lactose
maltose
sucrose
what two monosaccharide’s make up lactose
glucose and galactose
what two monosaccharide’s make up maltose
glucose and glucose
what two monosaccharide’s make up sucrose
glucose and fructose
what needs to breakdown before absorption can occur
disaccharides, by enzymes
all monosaccharide’s are converted to glucose by?
the liver
what enzyme breaks down disaccharides to monosaccharide’s
disaccarideases
how is glucose and galactose absorbed
active transport
how is fructose absorbed
facilitated diffusion
the three polysaccharides
starch
glycogen
fibre
where is starch found
plants
where is glycogen found
animals
list the polysaccharides in order starting with most branched
glycogen
starch
fibre
what is an example of an insoluble fibre
cellulose and hemicellulose
benefits to a fibre rich diet
norm blood cholesterol concentrations modulate blood sugar maintains healthy bowel function healthy body weight complex CHO protect against heart disease and stroke viscous fibres lower cholesterol level
true or false soluble fibres prevent large fluctuations of blood glucose
true
what is the glycemic index
ranking of how quickly a food rises blood glucose and corresponding insulin results
there are many factors affecting the rank so it is hard to predict
what is the glycemic load
evaluation of amount eaten at one time
what would a high butyrate [SCFA] high diet protect against
colon injuries
Fermentation of fibre in large bowels yields what
short chain fatty acids [SCFA]
fibre helps maintain a healthy body weight because it is generally low in
saturated fats and added sugars
fibre helps maintain a healthy body weight because you feel
full for a longer time, because the gastric emptying is delayed
what are the three main fibre cautions
- too much fibre and not an adequate amount of fibre will cause bowel blockage
- fibre acts as a chelating agent [ binding with minerals such as iron zinc and calcium]
- fibre is avoided by people with marginal intake and those at risk of malnutrition
what is the recommended serving of fibre
14g of fibre/1000kcal
how much CHO is needed to feed the brain every day
130g
when there is an inadequate amount of glucose for the body to break down what does it break down the in process of glycogenesis
protein
without adequate amount of CHO what is produced that throws off the acidity balance
Ketones
what can chronic ketones cause
- vitamins and mineral disturbance
- bone loss
- altered blood lipids
- kidney stones
- scant glycogen stores
how much glycogen does the liver store
60-120g [240-480kcals]
what percent glycogen is stored in the average persons skeletal muscle fibres
1%
how much glycogen does is stored in muscles
200-500g [800-2000kcal]
what percent of our glycogen is stored in out muscles
66%
when blood glucose levels are low what breaks down glycogen from the muscles and liver
glucagon
true or false: due to the highly branched nature of glycogen glucagon acts slowly to release glucose into the blood stream
false, because it is branched it acts quickly because there is an attachment site on each branch
CHO before exercise
3-4 hours
why would someone want to consume CHO before exercise
max. glycogen stress at the onset of exercise
allow athletes to start in a hyperglycemic state
CHO 30 minutes before exercise puts the athlete in what state
hypoglycemic state
true or false high glycemic index foods allow for rapid recovery
true
what is glycogen loading
max. stores of glycogen at onset of exercise
true of false: increase in secrum glucose results in decrease secrum insulin
false it would cause an increase in secrum insulin
what are the two concerns with fibre intake before exercise
- produce gas, bloating and abdominal pains
2. undigested CHO increase mass of stool in colon
Approx what Is the general intake recommendation of CHO
6-10g/kg
how many people are living with diabetes and are unaware
1/2
what is type 1 diabetes also known as
insulin dependent diabetes mellitus
what type of diabetes is the own person immune system attacks the cells of the pancreas
type 1
what is the leading chronic disease among children and adolescents
type 1 diabetes
what time of diabetes does the blood glucose level remain high while the muscles and tissue are starved for glucose
type 1
what is type two diabetes known as
insulin resistant
what type of diabetes can be managed with medications
type 2
how many veg servings are recommended for diabetics
5+
how many fruit servings are recommended for diabetics
3
how many grain and starch servings for diabetics
6-8
how many milk and alternative for diabetics
2-3
how many meat and alternatives for diabetics
4-8
how much fat and oil recommended for diabetics
moderation
what are the three lipids found
- triglycerides
- phospholipids
- sterols
true or false fat is necessary in a healthy diet
true
what contains a higher level of energy CHO or fat
fat has twice the amount of energy than CHO
what is: FFA usually incorporated into a complex compound
triglycerides
what are the three FFA acids attached to in a triglyceride
glycerol molecule
true or false all the FFA on the glycerol molecule is always the same length
false it can differ by saturation
how are triglycerides formed?
endogenously but dietary intake can influence their composition
what does saturated refer to
hydrogenation of FFA
max. hydrogen part of FFA= saturated
when does the point of unsaturation occur
when a carbon does not contain a max H.
what are common sources of unsaturated fats
plants and fish
what is it called when there is only one point of unsaturation
monosaturated fatty acid [MUFA]
what is it called when there is two plus points of unsaturation
polyunsaturated fatty acid [PUFA]
how are fatty acids named
based on the location of the first double bond
what is the transports of fat
lipoprotein
what are the four lipoproteins
- chylomicron
- VLDL
- LDL
- HDL
what are the chylomicrons
within the intestinal cells, monoglycerides and LCFA[long chain fatty acids] are re-packed into triglycerides and combined with protein and phospholipids
how do LCFA and monoglycerides travel the blood stream
via chylomicron
true or false as the chylomicron pass through the body tissues are able to remove needed components
true
what does the apolipoprotein portion of the chylomicron do
provides structural support, cellular recognition and binding
what is larger LDL or HDL
LDL
what is higher in cholesterol LDL or HDL
LDL
what is higher in protein LDL or HDL
HDL
does LDL or HDL deliver cholesterol from the liver to the tissues
LDL
does LDL or HDL scavenge cholesterol and return it to the liver
HDL
what is the risk of heart attack and atherosclerosis is closely related to ____elevated levels
LDL
consumption of trans fat raises____ and lowers___
raises LDL
lowers HDL
what is dyslipidemia
a lipid profile that increase the risk of atherosclerotic development
condition with increased LDL and decreased HDL
individuals with dyslipidemia should follow what dietary recommendations
avoid saturated fat, trans fat, and dietary cholesterol [no more than 10% sat a day]
include unsaturated fats
choose lean meats
what are the three ways in which fatty acids differ
- length
- saturation
- shape
what are the two ends of a fatty acid
- methyl [ 3 H]
2. acid end [ double bond with O and a OH group]
How many carbon, double bonds, saturation and common food sources in stearic acid
18 carbons
0 double bonds
saturated
animal fats
how many carbons, double bonds, saturation and common food sources for oleic acid
18 carbons
1 double bond
monounsaturated
olive and canola oils
how many carbons, double bonds, saturation and common food sources for linoleic acid
18 carbons
2 double bonds
polyunsaturated
sunflower, safflower, corn soybeans
how many carbons, double bonds, saturation and common food sources for linolenic acid
18 carbons
3 double bonds
polyunsaturated
soybeans, canola, flax and walnuts
what is linoleic acid also known as
omega 6
What is linolenic acid known as
omega 3
where are the double bonds on the linoleic acid
carbon 6 and 9
where are the double bonds on the linolenic acid
carbons 3, 6 and 9
how much linoleic acid is recommended each day for both genders
17g/day Men [approx. intake 14g/day]
12g/day Women [approx. intake 9.5g/day]
how much linolenic acid is recommended each day for both genders
- 6g/day Men [approx. intake 2.5g/day]
1. 1g/day Women [approx. intake 1.5g/day]
what acid is used to synthesis arachadonic acid
linoleic acid
what does arachadonic acid make
eicosanoids
what do eicosanoids act like
hormones and mediate inflammation
what are the sources of arachadonic acid
vegetables
linolenic acid is used to synthesis what two acids
EPA- eciosapentarnoic acid
DHA- docosahexaenoic acid
true or false linoleic acid increases triglycerides synthesis and VLDL
false it decreases it
omega 3 is thought of as being…
anti-inflammatory
omega 6 is thought of as being…
pro-inflammatory
fish supplements may interfere with…
bleeding and coagulation time and may suppress immune system
true or false fish supplements can contain harmful toxins such a mercury
true
catabolic hormones are elevated when____ levels are low
insulin
FFA usage is promoted by hormones associated with exercise and fasting:
glucagon, epinephrine, cortisol
adrenicortictrpic hormones, thyroid stimulating hormone, growth hormone
during exercise where does FA come from
within the muscle cell of the circulation
FA from adipose tissue
circulation TG are dependent on two factors:
- rate of lipolysis
2. association of FFA with albumin
true of false during endurance exercise the relative contribution made by fat to muscle fuel decreases with increased intensity
true
what us the most import stimulator of lipolysis during exercise
catecholamine’s
what are the three catecholamine’s
epinephrine
cortisol
glucagon
how does cortisol influence hormone levels
stimulates HSL[hormone sensitive lipase] during higher intensity longer duration exercise
how does glucagon influence hormone levels
increase in HSL if blood glucose levels drop during exercise
what is the inhibitor of HSL
insulin
when is max lipolysis occur
moderate-high intensity submaximal exercise when increased levels of catecholamine’s are present with a blunting of insulin released
does glucose undergo some anaerobic metabolism
yes
what is the explanation of decrease in FA use with increasing intensity
due to m. contraction, BP increasing which increases CO to the lungs for oxygenation
what two FA form circulating lipoprotein
chylomicron
VLDL
is chylomicron or VLDL available during exercise
VLDL
muscle adaption in response to ________ training by increasing _______ capabilities which increases_____ and decreases _____ use during exercise
cardiorespiratory
oxidative
fat
glycogen
how does regular cardiorespiratory training affect LDL and HDL
increase HDL and total cholesterol
decrease LDL
chronic elevation in BP is called
hypertension
what measurement is BP expressed in
mmHg
what are the two measurements of BP
systolic
diastolic
what is the desired BP
120/80mmHg
what is known as the silent killer
hypertension
Hypertension can cause:
kidney disease congestive heart failure myocardial infarction stroke aneurysm
what is the origin of high vasopressin
hypothalamus
hypertension is a result of increased______&______
vasopressin
angiotensin II
common causes of hypertension
smoking
neurological disease
adrenal disorder
lifestyle changes for HTN
increase in PA
smoking cessation
nutrition adjustments
weight loss
nutritional interventions for HTN
sodium decrease to 2300mg/day
ETOH 2d/day Men 1d/day Women
Potassium, calcium, Magnesium- reduce BP
4-6 potassium per day
what is the key difference between CHO and fats with protein
amino acid
how many different kinds of amino acids are there
20
true or false all amino acids contain the same backbone
true: carbon amine acid group side chain
how do amino acids connect together
peptide bonds
what are the three AA
dipeptides
tripepides
polypeptides
two varieties of protein
globular shape
protein strands can function alone or in networks
what is the protein shape called with 4 associated strands
hemoglobin
what changes the protein shape and loss of function
heat acid base alcohol heavy metal agitation
what breaks down protein in stomach
HCL hydrochloric acid
what cleaves proteins to smaller polypeptides and some free amino acids
pepsin
in small intestines what does polypepides get broken down into
tripeptides
dipeptides
amino acids
once protein is in the blood stream where is it transported
liver
what are the 7 functions of proteins
- growth and maintenance
- enzymes and hormone
- antibodies
- fluid electrolytes balance
- acid and base balance
- blood clotting
- protein for energy
what does protein growth and maintain include
protein turnover
continuous breakdown and synthesis of body protein involving the recycling of amino acids
what does protein enzyme and hormones include
facilitate chemical raxns/ regulates internal environment
what does protein antibodies include
protein in blood recognizes foreign proteins
what does protein fluid electrolytes balance include
albumin maintains oncotic pressure and prevents edema
what does protein acid and base balance include
acts as a buffer to maintain pH
what does protein blood clotting include
trap platelets
what does protein for energy include
protein break down
FA cannot be converted into glucose
no protein storage
what does the NS NEED
glucose
what can be adapted by the CNS for energy
ketosis
what are the concerns with ketones
elevated lipid levels rapid weight loss insulin limits skeletal m. breakdown increase in urea excretion from kidneys high obesity with high fat diets
AA in a cell is used to:
build protein
convert to other AA or small Nitrogen containing compounds
AA striped of N:
burned as fuel
converted to glucose and fat
AA wasted when:
energy is lacking
protein is over abundant
quality of protein is low
Protein quality for plants and animals %
plants 70-90%
animal 90-99%
true or false: if essential amino acids are missing, body must dismantle its own proteins to obtain it
true
by limiting AA limits_____________
protein synthesis
what is a more complete protein source animals or plants
animals
complimentary proteins means
combining incomplete plant sources to create array of AA ex. legumes and grains
what does PDCAAS sound for
protein digestibility-corrected amino acid score
scale of 0-100 on protein quality
what is concerned 100 on the PDCAAS
egg whites
tuna
chicken
ground beef
what is PEM
protein energy malnutrition
- inadequate intake of protein and calories
what is Marasmus
- overall inadequate diet
- lean
what is kwashiorkor
- edema and swollen belly
- protein inadequacy