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Which of the following isotopes is(are) used in the doubly labeled water method?

a. Oxygen-18 (18O)
b. Deuterium (2H)
c. Carbon-14 (14C)
d. Both a and b

User Zamicol
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1 Answer

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Final answer:

The doubly labeled water method uses isotopes oxygen-18 (18O) and deuterium (2H) to measure energy expenditure in individuals. a. Oxygen-18 (18O)

Step-by-step explanation:

The isotopes used in the doubly labeled water method are oxygen-18 (18O) and deuterium (2H). This technique involves the consumption of water labeled with these two stable isotopes to measure energy expenditure in individuals.

Since deuterium and oxygen-18 are non-radioactive, they provide a safe way to track the body's production of carbon dioxide, which correlates with energy expenditure.

User YingYang
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