Energetic consequences of thermal and nonthermal food processing.
Level 5 - mechanism / opinion, no new human data
Animal laboratory research (rodent model)
PubMed 22065771 · doi:10.1073/pnas.1112128108
What was done
The authors used a mouse model to evaluate the net energetic consequences of thermal processing (cooking) versus nonthermal processing (pounding) applied to meat and starch-rich tubers. They monitored changes in body mass alongside food intake, physical activity levels, and dietary preferences in fasted animals to compare the energetic advantages of each preparation method.
What was found
The abstract reports no specific numerical values, effect sizes, or statistical metrics. Directionally, cooking meat substantially increased net energy gain, producing elevations in body mass that were not attributable to differences in food intake or activity levels. For both meat and tubers, the energetic benefits of cooking were superior to those of pounding, consistent with observed food preferences in fasted mice.
Why it matters
This study provides experimental evidence that cooking substantially increases caloric return from both meat and starch, supporting theories of human metabolic evolution and highlighting limitations in standard food labeling that ignores processing effects.
Limits
The study was conducted entirely in mice rather than humans, limiting direct translatability to human digestion. The abstract omits sample sizes, specific quantitative data, statistical measures of precision, and details on processing methods and exposure durations.
Cited by
- supports Cooking foods increases net energy yield and nutrient availability by breaking down plant and animal cell walls.