Basis of differentiation 

Lipids 

Fats

Definition 

Are a class of organic molecules that are soluble in organic solvents but insoluble in polar solvents including water 

Are an oily substance found in the body, under the skin or around the organs

Source

Are derived from plant sources such as seeds, nuts, and olives

Are derived from animal sources such as eggs, meat, and dairy

Correlation

Are a diverse group of biomolecules found in the animal body

Are a type of lipids

Physical Status

May occur as solid or liquids

Occur as solid substances

Solubility 

Are soluble in organic solvents but not in polar solvents such as water

Is soluble only in non-polar solvents and insoluble in polar solvents

Types 

3 types: 

• Triglycerides 
• Phospholipids 
• Steroids 

2 types: 

• Saturated fat 
• Trans fat 

Function 

• Serve as energy storage reservoir  
• Is a structural component of cell membrane
• Transmit signals from one part of the body to another
• Provide insulation and cushioning to internal organs

• Are used as an energy source
• Provide the body with insulation