Why does your body need lipids?

• A. They help with proper thyroid function.
• B. They protect cells from damage.
• C. They provide sustainable energy for your body.
• D. They help strengthen bones.

Answer: (C)

The main idea is that lipids provide a dense, long-lasting energy source for the body. Fats are stored in adipose tissue and can be released and burned during fasting or extended activity, supplying fatty acids that are processed in the mitochondria to produce ATP. This energy yield is high—about 9 kilocalories per gram—making fats especially useful for sustained, endurance-type energy needs when quick carbohydrate energy isn’t available. Lipids also play other important roles, like forming cell membranes and aiding vitamin absorption, but for the question asked, their ability to supply steady energy is the best fit.