Zoology - Digestion and Absorption Question with Solution | TestHub

During starvation,$i.e.,$when food requirement of body is not fulfilled by ingested food, reserve carbohydrates is used up first by the body. After carbohydrates, fat is used as energy source, and at last when both carbohydrates and fats are completely consumed, proteins are used as energy sources. Proteins are used at last because proteins are main structural component of body.