Free fatty acids are chemically active. They can behave like detergents, disrupt cell membranes, and make it difficult for cells to store large amounts of energy safely.
Nature found a better solution.
Instead of storing fatty acids one by one, living organisms attach three of them to a single glycerol molecule, creating a triglyceride.
This simple molecular design changes everything.
Triglycerides are chemically stable, energy-dense, and can be packed into tiny fat droplets without interfering with the surrounding cells. They become nature's long-term energy storage system, ready to be broken down whenever fuel is needed.
Global Chemical Database