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 mostly 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 is ultimately converted into heat through metabolism, so describing the energy content of food in terms of calories, which is a unit of heat energy, makes the most sense.

The Energy Content of Food Is Described in Terms of Calories