What are the differences between lipids and carbohydrates?

Question

Accepted Answer

Lipids and carbohydrates are two types of essential organic compounds that have similar chemical compositions but differ in terms of structure, behavior, function, and food sources.

Basis of differentiation

Lipids

Carbohydrates

Definition

Are water-insoluble biomolecules composed of glycerol and fatty acids

Are water-soluble biomolecules composed of carbon, hydrogen, and oxygen

Composition

Major elements - C, H, O Minor elements - N, S

C, H, and O

Solubility

Are hydrophobic and not soluble in water

Are hydrophilic and soluble in water, except polysaccharides

Forms

Fats
Phospholipids
Fat-soluble vitamins 
Waxes
Sterols

Monosaccharides 
Disaccharides
Oligosaccharides
Polysaccharides

Energy generated per gram

Generates 9 kcal of energy per gram – more than double that of carbohydrates

Generates 4 kcal of energy per gram

Types of energy provided

Store energy for later use

Immediate energy source

Major Digestive Enzyme

Lipase

α-amylase

Function

Cellular energy storage 
Provide structural stability for cells
Insulation & cushioning for vital internal organs 
Facilitate signaling processes 
Reproductive hormone synthesis
Facilitating absorption & distribution of fat-soluble vitamins

Energy supply for body organs & tissues
Creation of structural components 
Synthesis of coenzymes
Play a role in the immune system
Prevent blood clotting
Backbone of RNA

Food sources

Nuts, Seeds 
Legumes 
Fish & Seafood
Fruit such as Avocado

Starchy Plant-Based Foods (polysaccharides) 
Fruits (fructose)
Milk (lactose)

Basis of differentiation	Lipids	Carbohydrates
Definition	Are water-insoluble biomolecules composed of glycerol and fatty acids	Are water-soluble biomolecules composed of carbon, hydrogen, and oxygen
Composition	Major elements - C, H, O Minor elements - N, S	C, H, and O
Solubility	Are hydrophobic and not soluble in water	Are hydrophilic and soluble in water, except polysaccharides
Forms	Fats Phospholipids Fat-soluble vitamins Waxes Sterols	Monosaccharides Disaccharides Oligosaccharides Polysaccharides
Energy generated per gram	Generates 9 kcal of energy per gram – more than double that of carbohydrates	Generates 4 kcal of energy per gram
Types of energy provided	Store energy for later use	Immediate energy source
Major Digestive Enzyme	Lipase	α-amylase
Function	Cellular energy storage Provide structural stability for cells Insulation & cushioning for vital internal organs Facilitate signaling processes Reproductive hormone synthesis Facilitating absorption & distribution of fat-soluble vitamins	Energy supply for body organs & tissues Creation of structural components Synthesis of coenzymes Play a role in the immune system Prevent blood clotting Backbone of RNA
Food sources	Nuts, Seeds Legumes Fish & Seafood Fruit such as Avocado	Starchy Plant-Based Foods (polysaccharides) Fruits (fructose) Milk (lactose)

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