The energy content of food is described in terms of calories because
A) the amount of energy in food depends on the temperature.
B) food heats up as it is being digested.
C) the energy in food ultimately becomes heat.
D) heat is the main product of digestion.
E) heat is the main product of respiration.

Question

Quizplus · Accepted Answer

The energy in food ultimately becomes heat, which is why the energy content of food is described in terms of calories. Calories are a unit of measurement for the amount of heat needed to raise the temperature of one gram of water by one degree Celsius.

The Energy Content of Food Is Described in Terms of Calories