INTRODUCING
LIPIDS
Presented by GROUP 3
ICE BREAKER TIME!!!
GUESS THE IMAGE
ANSWER: BACON
GUESS THE IMAGE
ANSWER: BUTTER
GUESS THE IMAGE
ANSWER: COOKING OIL
WHAT DO THESE
HAVE IN COMMON?
Answer: They’re rich in lipids!
WHAT IS LIPIDS?
Lipids are organic compounds primarily composed of carbon, hydrogen, and oxygen. They are
mostly hydrophobic, that means they do not mix well with water. Lipids include a wide range of
substances such as fats, oils, waxes, steroids, and phospholipids. These molecules play vital
roles in the body and can be represented visually by structures like a basic lipid chain or
triglyceride model.
WHY IS LIPIDS IMPORTANT?
Lipids are important because they serve as a source of long-term
energy storage, providing more energy than carbohydrates. They
are a vital component of cell membranes, help with insulating the
body and protecting internal organs, and play a key role in
hormone production. These functions can be illustrated through a
diagram showing energy use, cell structure, and hormone
regulation
TYPES OF LIPIDS
TRIGLYCERIDES
Triglycerides, commonly known as fats and oils, are composed of
one glycerol molecule and three fatty acids. There are two main
types: saturated fats, which are solid at room temperature (such as
butter), and unsaturated fats, which remain liquid at room
temperature (such as olive oil). From a health perspective,
consuming too much saturated fat can increase the risk of heart
disease, while unsaturated fats are generally considered a
healthier choice.
POP QUIZ!!!
GUESS IF THE FOOD IS SATURATED OR UNSATURATED
ANSWER: UNSATURATED
ANSWER: SATURATED
ANSWER: SATURATED
ANSWER: UNSATURATED
PHOSPHOLIPIDS
hospholipids are essential components found in all cell
P
membranes. They are amphipathic molecules, meaning they
have a hydrophilic (water-loving) head and hydrophobic
(water-fearing) tails, allowing them to arrange themselves into
a bilayer that forms the structural foundation of the cell
membrane. This unique arrangement acts like the security
wall of a cell, controlling what enters and exits.
STEROIDS
teroids are a type of lipid characterized by
S
their structure of four fused carbon rings.
Examples include cholesterol, which is a
component of cell membranes, and hormones
such as testosterone and estrogen. These lipids
play a crucial role in regulating various body
processes and supporting cell function.
WAXES
axes are lipids that serve primarily as a form
W
of protection by providing waterproofing.
They are found in various places, such as on
leaves to prevent water loss, in the ears as
earwax, and on animal fur for protection. Even
plants rely on waxes to survive by keeping
moisture in and harmful elements out.
COMPARISON OF
LIPIDS TYPE:
Triglycerides are made up of one
—
glycerol molecule and three fatty acids.
Their main function is energy storage, and
they are commonly found in substances
like butter and oil.
— Phospholipids consist of a glycerol
backbone, two fatty acids, and a
phosphate group. They play a vital role in
forming cell membranes, particularly in
cell bilayers.
— Steroids have a unique structure made
up of four fused carbon rings. They
function as hormones and are also found
in cell membranes. Examples include
cholesterol and estrogen.
Waxes are composed of long-chain
—
alcohols and fatty acids. Their primary
function is protection and waterproofing,
and they are typically found on leaves, in
earwax, and on animal fur.
Functions of Lipids
in the Body
Lipids serve several important functions in the body:
they act as a long-term energy source, help insulate
the body by preserving heat and protecting organs,
and are a crucial component of cell structures. They
are also essential for hormone production and aid in
the absorption of fat-soluble vitamins such as A, D,
E, and K.
SOURCE OF LIPIDS
Sources of lipids can be classified as healthy or
unhealthy. Healthy lipids are found in foods like
avocados, nuts, fatty fish such as salmon, and olive oil,
which provide beneficial fats for the body. On the other
hand, unhealthy lipids are commonly found in
processed foods containing trans fats and in foods high
in excessive saturated fats, which can negatively impact
heart health when consumed in large amounts.
Lipids in Daily
Life & Industry
In the food industry,
lipids are used to
enhance taste, prove
texture, and provide
a feeling of fullness
or satiety after
eating.
I n skincare, lipids are
found in products
like moisturizers and
lip balms, where
they help protect
and hydrate the skin
In the field of
biofuels, plant-
based oils are
processed into
biodiesel, offering a
cleaner and
renewable energy
source
For waterproofing,
lipids such as waxes
are used in products
like waxed paper,
rain gear, and
protective coatings.
I n pharmaceuticals,
lipids act as carriers
for fat-soluble drugs,
improving the
body’s ability to
absorb certain
medications.
DEBUNKING LIPID MYTHS
There are many misconceptions about lipids, especially fats, so it's important to debunk
common myths and help students understand the truth:
. The first myth is "All fats are bad." This is false—
1
in reality, some fats are essential for the body.
Healthy fats, such as those found in avocados,
nuts, and olive oil, play a vital role in energy
production, brain function, and hormone
regulation. Not all fats are harmful—in fact, our
bodies need the right kinds of fats to function
properly.
. Another common myth is "Fat makes you fat."
2
While it’s true that consuming fat adds calories,
not all fat leads to weight gain. It’s the excess of
any calorie source—whether from fats,
carbohydrates, or proteins—that causes weight
gain. Healthy fats, when eaten in moderation, can
even support weight management by helping you
feel full longer.
. Lastly, the myth that "Low-fat means healthy" is
3
also not always true. Many low-fat or fat-free
products often contain added sugars, salt, or
artificial ingredients to make up for the loss in
flavor. It’s important to read ingredient labels and
not assume that low-fat automatically equals a
healthier choice.
THANK YOU FOR LISTENING!!!
