Protein TEF = 20–30%
Protein has a thermic effect of food (TEF) of 20–30%, meaning you net only 70–80 calories from every 100 calories of protein consumed — far higher than carbs or fat.
Snapshot · Huberman Lab
Essentials: The Science of Eating for Health, Fat Loss & Lean Muscle | Dr. Layne Norton
Explore episode
Jun 25, 2026
Where this was said
Daily Energy Expenditure; Non-Exercise Activity Thermogenesis (NEAT)
At 5:53 · chapter starts 4:10
If the 'calories in' side of the ledger is complicated, the 'calories out' side is even more so. Norton organizes it into four buckets: resting metabolic rate (50–70% of daily burn), the thermic effect of food (5–10%), exercise, and NEAT. He takes particular care with the TEF, pointing out that fat is metabolically cheap to process at just 0–3%, carbohydrates cost 5–10%, and protein carries a 20–30% metabolic toll — meaning 100 calories of protein yields only 70–80 net calories. [1] — Layne Norton "Protein TEF = 20–30%: Protein has a thermic effect of food (TEF) of 20–30%, meaning you net only 70–80 calories from every 100 calories of …" 05:53 This is the mechanistic backbone of why high-protein diets support fat loss and muscle retention simultaneously. The episode's most quotable moment arrives here: Norton corrects the popular claim that 'not all calories are created equal' with a sharp analogy — calories are a unit of measurement, like seconds on a clock, and units don't vary. [2] — Layne Norton "Not all calories are created equal. That's not true because calories are just a unit of measurement, right? That would be like saying not a…" 04:58 What does vary is how different food sources affect energy expenditure and appetite after consumption. This distinction, he argues, is crucial for having honest conversations about nutrition.
The Thermic Effect of Food: Why Protein Burns More
Fat costs nearly nothing to digest (0–3% TEF), carbs cost 5–10%, but protein burns 20–30% of its own calories just to be processed. Eating 100 calories of protein nets you only 70–80 — a real metabolic advantage for anyone trying to lose fat while keeping muscle.
NEAT up to ~1,000 cal/day
Non-exercise activity thermogenesis (NEAT) — fidgeting, hand gestures, incidental movement — can burn hundreds to nearly 1,000 calories per day and is highly modifiable.
NEAT: The Most Modifiable Calorie Burn You're Ignoring
Non-exercise activity thermogenesis — every hand wave, foot tap and fidget — can burn hundreds to close to 1,000 calories daily and is the most modifiable component of energy expenditure. Most people focus on workouts but overlook this enormous, unconscious calorie lever.
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