Can we count calories correctly?

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Basal metabolic rate studies in humans: measurementand development of new equations.

To facilitate the Food and Agriculture Organization/ World Health Organization/United Nations University Joint (FAO/WHO/UNU) Expert Consultation on Energy and Protein Requirements which met in Rome in 1981, Schofield et al. reviewed the literature and produced predictive equations for both sexes for the following ages: 0–3, 3–10, 10–18, 18–30, 30–60 and >60 years. These formed the basis for the equations used in 1985 FAO/WHO/UNU document, Energy and Protein Requirements.

While Schofield’s analysis has served a significant role in re-establishingthe importance of using basal metabolic rate (BMR) to predict human energy requirements, recent workers have subsequently queried the universal validityand application of these equations. A survey of the most recent studies(1980–2000) in BMR suggests that in most cases the current FAO/WHO/UNUpredictive equations overestimate BMR in many communities. The FAO/WHO/UNU equations to predict BMR were developed using a database that contained adisproportionate number – 3388 out of 7173 (47%) – of Italian subjects. The Schofield database contained relatively few subjects from the tropical region.

 The objective here is to review the historical development in the measurementand application of BMR and to critically review the Schofield et al. BMR database presenting a series of new equations to predict BMR.

Design -This division, while arbitrary, will enable readers who wish to omit the historical review of BMR to concentrate on the evolution of the new BMRequations.Setting BMR data collected from published and measured values.

Subjects – A series of new equations (Oxford equations) have been developed using adata set of 10 552 BMR values that (1) excluded all the Italian subjects and(2) included a much larger number (4018) of people from the tropics.

Results – In general, the Oxford equations tend to produce lower BMR values than thecurrent FAO/WHO/UNU equations in 18–30 and 30–60 year old males and in allfemales over 18 years of age.

Conclusions – This is an opportune moment to re-examine the role and place of BMRmeasurements in estimating total energy requirements today. The Oxfordequations’ future use and application will surely depend on their ability topredict more accurately the BMR in contemporary populations.

My opinion to that matter is always to take measures of a person (body and behavior) before «count» Basal metabolic rate or calorie intakes.

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