Mammals use fat as a long-term store of energy
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The primary cellular function of fatty acids is long term energy storage. The body stores small amount of excess nutrients as triglycerides for storage. Triglycerides are efficient energy storing molecules as more energy can be stored in fat than in glycogen. Fat contains 9 kcal per gram whereas carbohydrates and protein only contain 4 kcal per gram. In other words, fat is more calorie dense so can hold a greater amount of energy in a smaller space
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In animals, fats form the only large-scale energy store. Fats are a more concentrated energy source than carbohydrates; oxidation yields roughly nine and four kilocalories of energy per gram, respectively.
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