A limit on the energy transfer rate from the human fat store in hypophagia

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I think this study is significant for those embarking on a CRON

lifestyle. Estimates the maximum amount of fat mass that can be

catabolized for energy while restricting calories before lean tissue

is significantly lost for energy needs. How fast should you permit

weight loss while dieting/CRON? This may help answer that..

I've read that (290 kJ/kgd is approx 30 calories/lb of fat mass? (Not

'per lb bodyweight' but 'per lb fat mass'. Can anyone verify this?

1: J Theor Biol. 2005 Mar 7;233(1):1-13. Epub 2004 Dec 8.Click here to

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A limit on the energy transfer rate from the human fat store in

hypophagia.

Alpert SS.

Department of Physics and Astronomy, University of New Mexico,

Albuquerque, NM 87131-1156, USA. sialpert1@...

A limit on the maximum energy transfer rate from the human fat

store in hypophagia is deduced from experimental data of underfed

subjects maintaining moderate activity levels and is found to have a

value of (290+/-25) kJ/kgd. A dietary restriction which exceeds the

limited capability of the fat store to compensate for the energy

deficiency results in an immediate decrease in the fat free mass

(FFM). In cases of a less severe dietary deficiency, the FFM will not

be depleted. The transition between these two dietary regions is

developed and a criterion to distinguish the regions is defined. An

exact mathematical solution for the decrease of the FFM is derived for

the case where the fat mass (FM) is in its limited energy transfer

mode. The solution shows a steady-state term which is in agreement

with conventional ideas, a term indicating a slow decrease of much of

the FFM moderated by the limited energy transferred from the fat

store, and a final term showing an unprotected rapid decrease of the

remaining part of the FFM. The average resting metabolic rate of

subjects undergoing hypophagia is shown to decrease linearly as a

function of the FFM with a slope of (249+/-25) kJ/kgd. This value

disagrees with the results of other observers who have measured

metabolic rates of diverse groups. The disagreement is explained in

terms of individual metabolic properties as opposed to those of the

larger population.

PMID: 15615615