The centenary of the Harris-Benedict equations

How to assess energy requirements best? Recommendations from the ESPEN expert group

Background & aims: The year 2019 marked the centenary of the publication of the Harris and Benedict equations for estimation ofenergy expenditure. ln October 2019 a Scientific Symposium wasorganized by the European Society for Clinical Nutrition and Metabolism (ESPEN) in Vienna, Austria, to celebrate this historical landmark, looking at what iscurrently known about the estimation and measurement of energy expenditure. Methods: Current evidence was discussed during the symposium, including the scientific basis and clinical knowledge, and is summarized here to assist with the estimation and measurement of energy requirements that later translate into energy prescription.

Results: ln most clinical settings, the majority of predictive equations have low ta moderate performance, with the best generally reaching an accuracy of no more than 70%, and often lead to large errors in estimating the true needs of patients. Generally speaking, the addition of body composition measure­ ments did not add ta the accuracy of predictive equations. Indirect calorimetry is the most reliable method ta measure energy expenditure and guide energy prescription, but carries inherent limitations, greatly restricting its use in real life clinical practice.

Conclusions: While the limitations of predictive equations are clear, their use is still the mainstay in clinical practice. lt is imperative to recognize specific patient populations for whom a specific equation should be preferred. When available, the use of indirect calorimetry is advised in a variety of clinical settings, aiming ta avoid under-as well as overfeeding.

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