What Do Fats Do in Your Body?

Triglycerides, cholesterol and other essential fatty acids (fats your body can't produce on its own) store energy, insulate you and protect your vital organs. They act as messengers and start chemical reactions that help control growth, immune function, and reproduction.

The process of making, breaking, storing and releasing fats is key to how humans and all animals regulate their energy. But despite fat's importance, no one yet completely understands exactly how humans store it and call it into action.

According to Live Science:

"... [T]riglycerides are especially suited for energy storage because they pack more than twice as much energy as carbohydrates or proteins ... Cell membranes encase our cells and the organelles inside them. Fat -- specifically, cholesterol -- makes these membranes possible."

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