Lipids Flashcards
Group of water-insoluble, energy-yielding organic
compounds composed of C, H, and O.
LIPIDS
DIFFERENCE of lipids with carbohydrates
Similar structure with carbohydrates but differs in
quantities.
what are the 3 kinds of lipids
triglycerides
phospholipids
sterols
fats and oils Comprises of 98% of fat in food.
triglycerides
WHAT IS THE DIFFERENCE BETWEEN LIPIDS AND FAT?
• Lipids are a broad group of biomolecules
fats are just a type of lipid stored in adipose tissues, and covers some parts of the vital organs
FUNCTIONS OF FATS
- Primary function of fat is to fuel the body.
- Insulate and cushion internal organs to protect them from mechanical injury.
- Regulate temperature
- Absorbs fat soluble vitamins A, D, E, and K
Building block of lipids
FATTY ACIDS
where do Long-chain fatty acids come from?
– come from meats, fish, vegetable
oils.
Smaller amounts of medium chain has how many atoms?
(6 – 10 carbon atoms)
short-chain has how many atoms?
(2 – 4 carbon atoms
Smaller amounts of medium chain (6 – 10 carbon atoms) and short-chain (2 – 4 carbon atoms) come from?
dairy products
The body absorbs short- and medium-chain fatty
acids the same way with long-chain fatty acids.
true or false
false
give an example on how the type and proportion of fatty acids present influence the
sensory and functional properties of the food
The butter acts and taste different from
corn oil.
However, they are both lipids.
Not synthesized in the body.
ESSENTIAL FATTY ACIDS
Should be taken from the diet.
ESSENTIAL FATTY ACIDS
give 4 importance of essential fatty acids
Maintain healthy skin.
o Promoting normal growth in children.
o Component of cell membranes.
o Precursors of eicosanoids (prostaglandins,
thromboxane, and leukotrienes).
§ Regulate BP and blood clotting.
give examples of eicosanoids
prostaglandins,
thromboxane,
and leukotrienes
At rest, fat provides 60% of calorie needs.
Why?
because there are some actions in our body that is
involuntary, so they need something to fuel them
up to do their physiologic processes from time to
time.
how many calories does fat have?
9 cal/g
longer and denser
Abdominal cavity contains two layers of fat to
protect the internal organs.
Insulate and cushion internal organs to protect them from
mechanical injury.
how does Fat under the skin helps to regulate body
temperature?
serving as a layer of insulation
against the cold.
vitamin for vision, reproduction, bone health,
immune system and skin.
Vitamin A
strengthens bones,
calcium absorption and
immune system
Vitamin D
what vitamin is responsible for immune system, and flushes toxin?
(may manifest clear skin).
Vitamin e
vitamin for blood clotting (prevent newborn
bleeding) and bone health
Vitamin K
A minimal amount of chemical digestion of fat occurs in the?
mouth (lingual lipase) and stomach (gastric lipases) through the action of enzymes.
Fat entering the duodenum stimulates the release of the hormone?
cholecystokinin
what stimulates gallbladder to release bile
cholecystokinin
emulsifier produced in the liver from bile salts, cholesterol,
phospholipids, bilirubin and electrolytes
Bile
most important and powerful lipase;
splits off one fatty acid at a time from the triglyceride
molecule.
Pancreatic lipase
The end products of digestion?
mostly monoglycerides
with free fatty acids and little glycerol
where are monoglycerides
with free fatty acids and little glycerol be absorbed in?
intestinal cells.
how much fat is normal to escape digestion and be excreted in feces?
small amount of fat (4 – 5 g)
About 95% of consumed fat is absorbed mostly in the?
duodenum
and jejunum
Absorption of larger fat particles gets dissolved into?
micelles
Once inside the intestinal cells, the monoglycerides and longchain fatty acids combine to form?
triglycerides.
where is glycerol absorbed?
directly through the
mucosal cells into capillaries.
The reformed triglycerides, along with phospholipids and cholesterol, become encased in protein to form?
chylomicrons
what are chylomicrons?
distribute dietary lipids throughout the body.
what increases when carbohydrate is inadequate or unavailable?
FAT CATABOLISM
what happens when there is inadequate glucose?
breakdown of
fatty acids is incomplete, and ketones are formed.
ketosis and acidosis may
result.
Fatty acids can be reassembled to make glucose.
true or false
false
Fatty acids cannot be reassembled to make glucose.
why is fat an
inefficient choice of fuel for glucose-dependent
brain cells, nerve cells, and RBCs?
Only the glycerol component of triglycerides can
be used to make glucose
what represents the body’s largest and
most efficient energy reserve?
Fat stored in adipose cells
Most newly absorbed fatty acids recombine with glycerol to form what? and where is it stored after?
form triglycerides that end up stored in adipose tissue.
what virtually has limitless capacity to store fat
and carry very little additional weight as intracellular water?
Adipose cells
for normal weight, how long can fat reserves last up?
2 months
While glycogen reserves may last for?
half a day of
normal activity.
how many calories does each pound of fat provide?
s 3,500 calories.
Comprises of oils and fats
TRIGLYCERIDES
Approximately 98% of fat in food.
TRIGLYCERIDES
Composed of C + H > O –– more calories/gram (9 cal/g) than
carbohydrates.
TRIGLYCERIDES
4 degrees of Saturation
Saturated Unsaturated
Monounsaturated Polyunsaturated
4 single bonds with hydrogen atoms each.
Saturated
Healthy Fats
Unsaturated
1 or double bonds form between carbon
atoms.
Unsaturated
1 double bond exists between 2 carbon
atoms.
Monounsaturated
More than 1 double bonds between carbon
atoms.
Hydrogenare not attached per carbon
atom.
Polyunsaturated
– process of breaking down fatty acids
Oxidation
guve by-product of fat oxidation
Free Radicals.
what are negative effects of free radicals
o Damages the cells, including DNA, and
proteins and its qualit
what can counterattack free radicals?
antioxidants – ‘free
radical scavengers’
can be obtained from
food and supplements
what does bad fats do?
o Increase blood cholesterol
o Increase low-density lipoproteins.
o Inner linings of arteries are prone to inflammation
causing heart attack.
Deposited plaque may be dislodged to
brain or heart causing stroke and heart
attack, respectively is a negative effect of?
Bad fats
give 2 functions of saturated fat
o Provide structure to cell membranes
o Facilitate normal function of proteins.
give 3 sources of animal fats of saturated fat
meats,
whole-milk dairy products
egg yolk.
give 3 sources of vegetable fats of saturated fat
palm oil, palm kernel oil and
coconut oil.
what happpens to unsaturated fatty acids at room temperature?
liquid at room temperature.
Referred to as ‘oils.’
UNSATURATED FATS