Regarding energy density, how much more energy do fats (lipids) provide per gram than carbohydrates or proteins?
Answer
Fats provide more than twice the energy per gram compared to carbohydrates or proteins.
Fats, also known as lipids, are characterized by being a highly concentrated source of energy. Quantitatively, this means that on a per-gram basis, fats yield significantly more caloric energy than either carbohydrates or proteins. Specifically, fats supply over double the energy output per gram when compared to the other two major energy-providing macronutrients. Despite this high caloric density, fats are necessary for essential functions such as absorbing certain vitamins (A, D, E, K), insulating organs, and providing long-term energy storage.
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