Energy per kilogram in disease: why one number is insufficient

An estimate has a clinical context

ESPEN cancer guidance uses approximately 25–30 kcal/kg/day when individual total expenditure is not measured. This is an estimation approach, not a demonstrated threshold that prevents disease or muscle loss. [1]

Older patients and acute illness differ

The geriatrics guideline starts with a 30 kcal/kg/day guide and calls for adjustment. [2] In early critical illness, ESPEN favours progressive feeding and uses measured expenditure where possible; initial delivery can intentionally remain below full expenditure. This prevents the mistaken conclusion that every intake below a fixed daily number is inappropriate. [3]

What the denominator can conceal

Oedema, substantial fat mass and changes in lean tissue can alter the interpretation of an intake/body-mass ratio. A research dataset should record the actual weight and any clinical reference weight separately, with the reason for its use. It should also distinguish prescribed, delivered and consumed nutrition. A meal offered is not necessarily a meal eaten.

Connecting disease research to EPK

EPK–008 and EPK–010 propose observational work under existing clinical care, separating disease and recovery phases. Links to EPK–004 and EPK–005 concern function and nutritional adequacy; the link to EPK–007 concerns a hypothesis about immune function. These nutrition guidelines do not validate proportional danger theory.

The question is whether an explicitly defined ratio adds predictive value beyond disease severity, measured expenditure and body composition. If it does not, the framework should report that result rather than preserve a universal cutoff.

Related working papers

Read the relevant PDFs: EPK–001 to 007 are the revised version 1.2 papers; EPK–008 to 010 are version 1.0 supplements. Earlier PDFs and DOI records remain on the paper archive.