Podbit · Huberman Lab
Food labels can be 20% off, gut microbiomes extract energy differently, and your resting metabolic rate alone accounts for 50–70% of all calories burned. Calories in vs. calories out sounds simple but involves multiple interacting systems that make precise tracking nearly impossible.
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At 0:54 · chapter starts 0:20
At first glance, 'calories in, calories out' sounds like a bumper sticker for dieting. Layne Norton immediately complicates that picture, walking through the cellular machinery that converts food into usable energy: fatty acids lopped off two carbons at a time in beta oxidation, amino acids funneled through gluconeogenesis into glucose, and the Krebs cycle churning out the hydrogen ions that power ATP synthesis. What makes energy balance truly tricky, he explains, is the 'calories in' side of the equation — food labels are legally permitted to be up to 20% off. [1] — Layne Norton "Food labels up to 20% off: FDA-allowed food label calorie counts can have up to a 20% margin of error, making precise tracking harder than …" 01:54 On top of that, insoluble fiber in plant material locks up carbohydrate and protein in a way that digestive enzymes can't fully break down, meaning metabolizable energy is always less than reported energy. Individual gut microbiomes add another wrinkle: some people are simply better at extracting calories from fiber than others, making the same meal functionally different for different people. Norton's conclusion is not that tracking is futile, but that consistent tracking will eventually reveal your own personal baseline — even if the numbers are imperfect.
FDA-allowed food label calorie counts can have up to a 20% margin of error, making precise tracking harder than most people assume.
Resting metabolic rate accounts for 50–70% of total daily energy expenditure, making it the single largest component of calories out.
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