The sole purpose of a fat cell is to store small droplets of fat molecules. These fat molecules are formed as the concentrations of fatty acids in the blood rises, such as after a big meal. An increase in concentrations within the blood triggers lipase enzymes located in fat tissue, to grab the fatty acids and convert them into a fat molecule (triacylglycerols) for storage.
In fact as we gain weight and become fatter the fat cells do not multiply, rather they just store more fat molecules thus they expand to become larger. Fat cells in the human can multiply but only if fat storage cells “run out”.
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