Experts can’t agree on how to measure caloric effects on metabolism.
. They’re not claiming this is the end-all-be-all account, they’re simply confident in their findings.
But a close look at the “limitations” section in their paper reveals a lot about what this debate is really about: methodology. These scientists used a method of quantifying metabolism called doubly labeled water that is considered by some to be a gold standard, but by others to be potentially flawed.
The idea of the whole room calorimeter is that the patient is literally locked in an airtight room, given meals through a slot in one wall, and generally observed within an inch of their lives. Cameras monitor how much they move around, how much they sleep, and so on. . It’s based on the principle that the rate at which you take in oxygen and exhale carbon dioxide, as well as the rate at which you exchange other gases and body heat, is directly tied to how quickly you’re burning energy.
But a few studies raised a potential issue: what if you’re not peeing out all the hydrogen? One of the basic assumptions of the doubly labeled water method is,, “that the H[ydrogen] of body water only leaves the body as water. Any loss of isotopes in other products will introduce an error into these techniques.” If your body is somehow holding onto some of that heavy hydrogen, that would artificially inflate the apparent metabolic rate of your study participants.
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