Cooking increases net energy gain from a lipid-rich food.
Level 5 - mechanism / opinion, no new human data
Preclinical animal model study (mice).
PubMed 25293786 · doi:10.1002/ajpa.22622
What was done
Using a mouse model, researchers tested the effects of cooking versus non-thermal mechanical processing (blending) on the energy gained from a lipid-rich food (peanuts). They measured net energy gained per calorie, assessed lipid digestibility via fecal fat excretion, and examined peanut diet microstructure to evaluate cell wall and oleosin layer integrity.
What was found
The abstract reports no numerical values. It states that cooking consistently increased the energy gained per calorie and increased lipid digestibility via reduced fecal fat excretion, whereas blending had no detectable energetic benefits. Structural analysis showed cooking altered the integrity of cell walls and the oleosin protein layer that shield lipids from lipases.
Why it matters
While previous work demonstrated that cooking increases caloric gain from starch- and protein-rich foods, this study shows that thermal processing also enhances net energy gain from lipid-rich foods, supporting evolutionary models of human dietary energy returns.
Limits
The study was conducted entirely in mice, so findings may not directly translate to human digestive efficiency. The abstract provides no sample size (n), quantitative values, or confidence intervals, preventing assessment of the precise effect size.
Cited by
- supports Cooking foods increases net energy yield and nutrient availability by breaking down plant and animal cell walls.