it is not HIS formula, he took it from Forbes theory:
Body fat and fat-free mass inter-relationships: Forbes’s theory revisited
Kevin D. Hall*
Laboratory of Biological Modeling, National Institute of Diabetes & Digestive & Kidney Diseases, National Institutes of Health,
Bethesda, MD 20892, USA
(Received 8 September 2006 – Revised 6 December 2006 – Accepted 17 December 2006)
A theoretical equation was developed by Forbes that quantifies the fat-free proportion of a weight change as a function of the initial body fat.
However, Forbes’s equation was strictly valid only for infinitesimal weight changes. Here, I extended Forbes’s equation to account for the magnitude
and direction of macroscopic body weight changes. The new equation was also re-expressed in terms of an alternative representation of
body composition change defined by an energy partitioning parameter called the P-ratio. The predictions of the resulting equations compared
favourably with data from human underfeeding and overfeeding experiments and accounted for previously unexplained trends in the data. The
magnitude of the body weight change had a relatively weak effect on the predicted body composition changes and the results were very similar
to Forbes’s original equation for modest weight changes. However, for large weight changes, such as the massive weight losses found in patients
following bariatric surgery, Forbes’s original equation consistently underestimated the fat-free mass loss, as expected. The new equation that
accounts for the magnitude of the weight loss provides better predictions of body composition changes in such patients.
the whole paper ( with the formula)is here:
http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=2376748&blobtype=pdfnever think for 1 second that adonis has the intellectual capacity to invent a fat loss formula

like everything that flows from his mouth like shit from an ass, it was found on google.