Biology / Unit 12 Bio 2787 short lesson, about 20 seconds
Macronutrient Caloric Density
Captions available
The idea
Carbohydrates and proteins supply about four to five kilocalories per gram, while fat supplies about nine, making fat the most energy-dense macronutrient.
In practice
Animals seeking lipid-rich food gain more stored energy per gram eaten than from an equal mass of carbohydrate.
Where people slip
Higher caloric density is not automatically harmful — it reflects efficient long-term energy storage, useful during famine or migration.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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