Fat

The fatty mouse on the left has a lot of adipose tissue. In many animals, adipose tissue is used to store energy. For comparison, a mouse with a normal amount of adipose tissue is shown on the right

Fat is one of the three main types of macronutrients.[1] Fats are found in many foods. They are made of macromolecules called lipids. Lipids are based on long-chain fatty acids. Some of these are essential because the body cannot make them.

  1. The others are proteins and carbohydrates.

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