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the claim
Metabolized food yields the exact caloric energy measured by bomb calorimetry
the verdict
REFUTED
the evidence says no
refutedsupported
the weight of evidence
0 sources for · 3 against

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.

Evidence against · 3
Host-diet-gut microbiome interactions influence human energy balance: a randomized clinical trial.
2023 · cited by 127
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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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.

More against · 2
Metabolic reconstitution of germ-free mice by a gnotobiotic microbiota varies over the circadian cycle.
2022 · cited by 37
Shows that the intestinal microbiota degrades indigestible components and alters energy recovery, demonstrating that net metabolizable energy differs from absolute gross energy content.
The In Vivo Net Energy Content of Resistant Starch and Its Effect on Macronutrient Oxidation in Healthy Adults.
2019 · cited by 11
Measures the actual in vivo net energy content of resistant starches in humans, showing they yield less energy than theoretical or gross caloric values.
Everything we examined (12)
  1. Host-diet-gut microbiome interactions influence human energy balance: a randomized clinical trial.peer-reviewedrefutes
  2. Partitional calorimetry.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  3. Effect of blending Jersey and Holstein-Friesian milk on Cheddar cheese processing, composition, and quality.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  4. Metabolic reconstitution of germ-free mice by a gnotobiotic microbiota varies over the circadian cycle.peer-reviewedrefutes
  5. Methods for the Comprehensive <i>in vivo</i> Analysis of Energy Flux, Fluid Homeostasis, Blood Pressure, and Ventilatory Function in Rodents.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  6. Genetic variation of macronutrient tolerance in Drosophila melanogaster.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  7. Deciphering macronutrient information about human milk.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  8. The In Vivo Net Energy Content of Resistant Starch and Its Effect on Macronutrient Oxidation in Healthy Adults.peer-reviewedrefutes
  9. Meal Timing and Sleeping Energy Metabolism.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  10. Bisphenol F Exposure in Adolescent Heterogeneous Stock Rats Affects Growth and Adiposity.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  11. Limit feeding as a strategy to increase energy efficiency in intensified cow–calf production systemspeer-reviewedno side takennot shown: read and judged not to bear on this claim
  12. Anchovy and sardine condition and energy content in the North Aegean Sea (eastern Mediterranean) in relation to their contrasting reproductive strategies.peer-reviewedno side takennot shown: read and judged not to bear on this claim
The paper trail · every fact has a biography
first checked05 Aug 2026
judged → REFUTED · 1305 Aug 2026
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