Is TDEE accurate for weight management?

TDEE provides a population average; individual variation is plus or minus 15-20%. For weight maintenance, matching caloric intake to TDEE is the target. For weight loss, a 500-750 kcal/day deficit typically achieves 0.5-1 kg/week loss.

How are activity factors determined?

Activity factors (PAL) are derived from doubly labeled water studies and represent the ratio of total energy expenditure to BMR. They have significant individual variation and should be adjusted based on actual weight change over time.

What activity factor should ICU patients use?

Critically ill patients typically have TDEE of 1.0-1.2 x REE (not higher, as mobility is restricted). Overfeeding in the ICU is harmful. Most guidelines target 70-100% of estimated TDEE during acute illness.

Total Daily Energy Expenditure (TDEE) by Activity Factor

Calculate total daily energy expenditure (TDEE) by multiplying REE by an activity factor. Sedentary (little/no exercise): REE x 1.2. Lightly active (1-3 days/week): REE x 1.375. Moderately active (3-5 days/week): REE x 1.55. Very active (6-7 days/week): REE x 1.725. Extra active (physical job + hard exercise): REE x 1.9.

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Frequently Asked Questions

Is TDEE accurate for weight management?

How are activity factors determined?

What activity factor should ICU patients use?