Harris–Benedict equation

Right.

Like normally you do these equations to figure it out, like Harris Benedict, all these online calculators like this tells you exactly what it is.

Right.

And it does change.

And we're going to measure your resting energy expenditure because that adaptive thermogenesis is measurable.

We can actually see a decrease in their resting energy expenditure that's well below the predicted, you know, using like Mifflin-St. Jor or the Harris-Benedict equation.

And so when I can show them that, suddenly they're having this aha moment like, oh, this explains it.

I thought I was in a caloric deficit.

You must use adjusted or ideal body weight.

In complex, critically ill surgical patients, predictive equations like Harris-Benedict often fail.

Indirect calorimetry is far superior.

Because it physically measures the exact volume of oxygen the patient concedes and the carbon dioxide they produce.