Future directions for energy requirements and food energy values.
Level 5 - mechanism / opinion, no new human data
Narrative review and expert perspective without original human data or systematic review methodology.
PubMed 8089742 · doi:10.1093/jn/124.suppl_9.1738S
What was done
This narrative review assesses historical approaches for determining food energy values (such as Atwater specific factors) and human energy requirements. It discusses the shift from population-level dietary planning to individualized diet formulation, the validation of population estimates using doubly labelled water, and the necessity of new analytical approaches for modern foods and food substitutes.
What was found
The abstract reports no numerical findings or empirical experimental data. It qualitatively notes that WHO and NRC population energy estimates based on total energy expenditure to basal metabolic rate ratios are validated by 10-14 day doubly labelled water studies, but individual predictions require accounting for body composition, physical effort quantification, and variations in metabolizable energy during non-steady-state conditions.
Why it matters
The paper highlights the limitations of using historical population-level metabolizable energy averages for individualized nutrition and novel food formulations.
Limits
This is a narrative review presenting expert commentary without original empirical data, quantitative outcomes, sample sizes, or systematic search methodology.
Cited by
- supports Wilbur Atwater established the caloric conversion values of approximately 4.1 calories per gram of carbohydrate and protein and 9 calories per gram of fat.