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Three Ways Energy Is Used
The answer to this requires a simple formula and a little bit of math.
The formula is an easy equation:
the total energy expenditure of the body equals
「
BMR + TEF + PA」
.
In the human body, the energy from different foods people eat is used to keep everything running smoothly.
The basal metabolic rate (BMR) is a
measurement of how much energy is needed to stay alive;
the thermic effect of food (TEF)
is a measurement of the energy used to consume and absorb energy
from food;
is a measurement of the energy used to consume and absorb energy
from food;
and physical activity (PA) is a measurement of the energy used beyond just lying in bed.
Learning about the composition of
these three elements can help people make better choices for their
health and well-being.
these three elements can help people make better choices for their
health and well-being.

In the human body, the energy from different foods people eat is used to keep everything running smoothly.
the energy from different foods people eat은 문장의 주어로, people eat 앞에는 different foods를 선행사로 갖는 목적격 관계대명사가 생략되었다.
is가 문장의 동사이다.