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the claim

Metabolized food yields the exact caloric energy measured by bomb calorimetry

the verdict
REFUTED
the evidence says no
Recorded sources
0 sources for · 3 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that metabolized food yields the exact caloric energy measured by bomb calorimetry?

No. Metabolized food does not yield the exact caloric energy measured by bomb calorimetry because biological digestion and gut microbiome fermentation result in incomplete absorption and variable net metabolizable energy.

Verdict: REFUTED · 0 sources for, 3 against · Last checked

The analysis

Bomb calorimetry measures the gross heat of combustion of food, but physiological studies (such as those measuring human metabolizable energy and net energy content of dietary fibers) consistently show that humans do not extract 100% of this energy due to incomplete digestion, fecal losses, and microbial fermentation in the gut.

Evidence against · 3
Host-diet-gut microbiome interactions influence human energy balance: a randomized clinical trial.
2023
Demonstrates that human metabolizable energy varies (e.g., 84.2-96.1% vs 95.4-97.0%) due to gut microbiome fermentation and fecal energy loss, meaning metabolized food does not equal gross bomb calorimetry energy.
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KD, C., EA, C., B, D., D, I., F, Y., A, M., TL, D., RE, P., BE, R., R, K., & SR, S. (2023). Host-diet-gut microbiome interactions influence human energy balance: a randomized clinical trial.. doi.org. https://doi.org/10.1038/s41467-023-38778-x

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More against · 2
Metabolic reconstitution of germ-free mice by a gnotobiotic microbiota varies over the circadian cycle.
2022
Shows that the intestinal microbiota degrades indigestible components and alters energy recovery, demonstrating that net metabolizable energy differs from absolute gross energy content.
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D, H., J, L., W, S., T, G., ML, S., E, C. B., M, A., TD, C., M, K., A, K., S, N., E, F., AJ, M., B, S., S, S., R, Z., WD, H., C, W., & E, S. (2022). Metabolic reconstitution of germ-free mice by a gnotobiotic microbiota varies over the circadian cycle.. doi.org. https://doi.org/10.1371/journal.pbio.3001743

The In Vivo Net Energy Content of Resistant Starch and Its Effect on Macronutrient Oxidation in Healthy Adults.
2019
Measures the actual in vivo net energy content of resistant starches in humans, showing they yield less energy than theoretical or gross caloric values.
Get citation
ED, G., IL, B., PS, M., Z, P., EL, M., KJ, H., MA, C., T, M., JA, H., & JA, H. (2019). The In Vivo Net Energy Content of Resistant Starch and Its Effect on Macronutrient Oxidation in Healthy Adults.. doi.org. https://doi.org/10.3390/nu11102484

What does the evidence say?

Bomb calorimetry measures the gross heat of combustion of food, but physiological studies (such as those measuring human metabolizable energy and net energy content of dietary fibers) consistently show that humans do not extract 100% of this energy due to incomplete digestion, fecal losses, and microbial fermentation in the gut.

Receipt History
first checked05 Aug 2026
judged → REFUTED · 1305 Aug 2026
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