Food Midterm Flashcards
characteristics of hunters and gatherers
primitive hunting (rocks, stones), men hunt women gather food, no clothes, nomadic, no fire
characteristics of neanderthals/cavemen
plant based diets, nomadic/no food storage, food specializations based on areas (fishermen near rivers animal hunters in mountains)
influence of fire
brain size increases, introduction of meat and starches, reduction in tooth size, smaller guts, larger bodies, migration moved north
agricultural revolution
villages, food preparation and storage, domestication of plants and animals, expansion of farming tools
disadvantages of the agricultural revolution
infectious disease spread rapidly, waste disposal issues, land fertility issues from overuse
industrial revolution
urbanization, railroads, fridges, penicillin discovered which increased population
food science
study of the physical, biological, and chemical makeup of food and the concepts underlying food processing
food science technology
application of food science to the selection, preservation, processing, packaging, distribution, and sale of food
macronutrients
carbs, proteins, fats and lipids
micronutrients
vitamins and minerals
physiologically food is for
nutrition (body mass, metabolism, energy) and satiety (hunger/thirst)
chemically most foods are
water, macromolecules, vitamins, minerals, coloring agents, taste/flavor
western world humoral theory
blood, phlegm, yellow bile, black bile (air, fire, earth, water)
eastern world yin
dark side of the mountain: dark, wet, cool, feminine
eastern world yang
sunny side of mountain: light, dry, warm, masculine
cold foods
fruits, leaf veggies, water plants, yin foods
hot foods
red meats, root vegetables, spices, yang foods
kosher
jewish proper foods
trief
jewish not kosher foods
halal
lawful muslim foods
haram
prohibited muslim foods
kosher laws
animals must have split hooves (eat grass), no birds of prey, fish with fins and removable scales, prohibition of blood, separation of dairy and meat, prohibition of grains at passover
halal laws
M means halal, prohibition of pork, alcohol, blood (blessing of animal before its killed)
orthodox christians
avoidance of olive oil, meat, fish, milk, and dairy products every Wednesday and Friday
culturally food can be a
status symbol
what are macronutrients
proteins, carbs, lipids
what is a calorie
Calorie is a unit of measure for energy that our body uses for all our vital process. don’t exceed 2k
how many cals in protein/carbs
4
how many cals in fats and oils
9
how many cals in alcohol
7
how many calories in water and minerals
0, body can’t break down fiber, no nutrients in water
simple carbs
monosaccharides and disaccharides
monosaccharides
glucose, fructose, galactose
disaccharides
2 simple sugars form a bond
lactose, maltose, sucrose
complex carbs
starches
complex carbs oligosaccharides
3-9 simple sugars combined
complex carbs polysaccharides
more than 10 simple sugars combined
starch bonds
glued by alpha linkages
fiber bonds
beta bonds
can fiber be broken down
yes
foods high in starch are
digested easily, raise blood sugar, have a high glycemic index
foods high in fiber
slow the release of glucose into the blood, lower glycemic index
foods with lowest glycemic index
meat, eggs, cheese
insulin is the main tool for
sugar management
insulin sensitivity
when it goes down it is insulin resistance
insulin resistance
less responsive and blood sugar fails to decrease
insulin resistance leads to
metabolic syndrome
metabolic syndrome
high blood pressure, wider waist, cardiovascular disease, diabetes
where are starches found
grains and grain based products
polysaccharides
a polymer of many sugar moieties
amylose
linear molecule straight chain
amylopectin
branched molecule
starch swelling
can shrink or swell by varying water content and heat
starch retrogradation
the realignment of the starch polymers that causes the expulsion of water, causes staling of bread
is staling the formation of mold
no
what does more amylopectin lead to
less retrogradation
what are starches high in amylopectin called
waxy starches (cornstarch)
why modify starches
makes foods have longer shelf lives, easier to dissolve, consistency, fat substitute, forming hard shells, keep oils from separating
other uses of carbs
flavoring and coloring, fermentation, dietary fiber, texture, thickness
protein structure
all proteins are composed of amino acids
proteins are composed of
acid part (carboxylic), amino end, R structure
how are amino acids linked
linear peptide chains
primary structure of proteins
polymers made of amino acids joined by linear peptide bonds, water molecule release every time a new peptide bond is added
tertiary structure of proteins
secondary structural elements fold over again, 3 dimensional shape formed
secondary structure of protein
beta sheets have hydrogen bonds that stabilize 2 or more adjacent strands of amino acids, provide strength to the structure
quaternary structure of proteins
2 or more polypeptide chains that come together
can we break a chain of amino acids
yes through hydrolysis or inserting a water molecule which breaks peptide bond
protein denaturation
disruption of secondary and tertiary structures, primary structure still intact
wheat proteins
albumins, globulins, prolamins, glutelins
promalins and glutelins add
strength and elasticity
bread flour/hard wheat
high gluten protein concentration, used for bread
all purpose flour
less protein compared to bread flour
soft wheat flour
least amount of protein and lowest gluten concentration
gluten free claims
improves GI problems, improved energy, weight loss, less autism but none are backed by evidence
other sources of protein
tofu, soy, insects, blood
4 groups of lipids
triglycerides, phospholipids, steroids, waxes
triglycerides
contain glycerol and fatty acids
oils
unsaturated and liquid at room temp
fats
saturated and solid at room temp
how many chains in saturated fatty acids
one chain
how many bonds in unsaturated fatty acids
double bonds, adds shelf life with trans fats
phospholipids
contain glycerol and fatty acids, phosphate group attached, hydrophilic at head and hydrophobic at bottom
steroids
composed of 4 carbons w different groups attached
waxes
non polar and repel water
how many cals in 1 g of fat
9
diluting a food w water _ the % of cals from fat
will not change
diluting a food w water will _ the % of fat by weight
decrease
how to calculate fat from cals
take g and multiple the cals per gram ex: 30 g of fat is 30x9=270 and 70 g of CHOs and protein is 70x4 total is 550 cal 270/550x100=49% fat by cal
new food labels have
total fat and types of fat
fat substitutes
simplesse, olestra, margarine
Why are lipids important in the diet?
Source of energy, enhance texture of food, flavoring agents, provide essential fatty acids, aid absorption of fat soluble nutrients, heat transfer agent, component of adipose tissue
How many fatty acid chains does a phospholipid have?
3
A triglyceride is comprised of 3 fatty acids attached to what?
glycerol
Which is more nutritionally accurate : fat as a % of weight or fat as a % of calories?
Fat as a % of calories
Eggs contain which type of “good cholesterol”
HDL (high density lipoprotein)
What are the four types of fat common in food?
Monounsaturated, polyunsaturated, saturated, trans
Which type of fat is the healthiest to consume?
Unsaturated
Which type of fat is the least healthy?
Saturated
Coconut oil is what kind of Fat?
Saturated
Which part of the amino acid determines its function and is unique to each
amino acid?
r group
How many amino acids commonly occur in proteins?
20
What three main parts/groups make up an amino acid?
Amino group, acid group, and R group
How many levels of structure do proteins have?
4
What type of bond is secondary structure stabilized by?
hydrogen bonds
Which bond stabilizes the alpha helix structure of proteins?
hydrogen bonds
What type of bond connects amino acids in primary structure?
peptide bonds
Cooking an egg is an example of ______
protein denaturation
Wheat proteins are also referred to as _________ proteins
gluten
Which wheat protein(s) is/are categorized as gluten?
Prolamins (gliadin) and Glutelins (glutenin)
Which wheat protein is responsible for the elasticity of dough?
Prolamins (gliadin)
T/F: Primary structure remains the same after denaturation
true
T/F: More proteins = more glutenins = weaker dough
false
What are some examples of alternative sources of protein?
soy, insects, blood
beans and legumes are
fruit
What is the simplest molecule your body can absorb
glucose
corn is a
Fruit, veggie, and whole grain
pumpkins and squash are
fruit
lettuce is a
veggie
cucumbers are
fruit
botanical classification of fruits
part of a plant that contain seeds
botanical classification of veggies
other parts of plants like roots, leaves and stems
Cultivar (cultivated + variety)
Distinct appearance from other varieties, must be possible to propagate
Why should we care about cultivars
Different cultivars have different properties and composition
Effects of cultivars differences on harvesting processing
Substantial differences among cultivars (shape, size, time of maturity, resistance to physical damage, chemical composition, cellular structure, and enzymatic activity)
vitamin a
Fat soluble
Immune system
Vision, reproduction
vitamin c
tissue growth and repair
Water soluble (Only one)
Boosts immune system
Oranges and lemon
vitamin e
Fat soluble
Antioxidant (protects cells from damage)
Immune function
Found in tomatoes, mangos
vitamin k
Fat soluble
Protein synthesis
Blood clots
Dark leafy greens
dry fruit
Pericarp (part of bean pond) splits open along definite seams
Legumes- an elongate bean pod splitting along 2 seams
Nut- large, one seeded fruit with very hard pericarp
Hazelnut and pecans are only real nuts
fleshy fruits
Berries- entire pericarp is fleshy, may be one or many seeded
Hesperidium- berry with a leathery rind and parchment like partitions between sections (citrus)
Pepo- berry with a hard, thick rind, typical fruit of the gourd family (watermelon)
Drupe- fleshy fruit with harder inner layer surrounding stone (peach) hard endocarp
Pomes- ovary or core with seeds surrounding by edible, fleshy, receptacle tissue that is really not part of the pericarp
Brazil nut
seed
peanuts
legumes
cashews
seeds
almonds
seeds
hazelnut
nut
pecan
nut
blueberries
berry
papaya
berry
guava
berry
green bean
legume
pineapple
aggregate fruit
strawberry
aggregate fruit
banana
berry
mango
drupe
avocado
berry
orange, lime, lemon
hesperidium
watermelon
pepo
apricot, cherry, peaches
drupe
apples, pears
pomes