| Value |
8.4
kg CO2/10kg fat lost
Range: (1.6 kg turn into water) figure - link kg CO2/10kg fat lost
|
| Organism |
Human Homo sapiens |
| Reference |
Meerman R, Brown AJ. When somebody loses weight, where does the fat go? BMJ. 2014 Dec 16 349:g7257. doi: 10.1136/bmj.g7257. p.3 figure 2PubMed ID25516540
|
| Method |
"The proportion of a triglyceride molecule’s mass exhaled in
CO2 is the proportion of its molecular weight (daltons)
contributed by its 55 carbon atoms plus four of its oxygen atoms:
(661 Da (C55)+64 Da (O4))/(861 Da (C55H104O6))×100=84%
The proportion of mass that becomes water is:
(105 Da (H104)+32 Da (O2))/(861 Da (C55H104O6))×100=16%
These results show that the lungs are the primary excretory
organ for weight loss (fig 2?). The water formed may be
excreted in the urine, faeces, sweat, breath, tears, or other bodily
fluids." |
| Comments |
"When somebody loses 10 kg of fat (triglyceride), 8.4 kg is exhaled as CO2. The remainder of the 28 kg total of CO2
produced is contributed by inhaled oxygen. Lungs are therefore the primary excretory organ for weight loss. (This calculation
ignores fat that may be excreted as ketone bodies under particular (patho)physiological conditions or minor amounts of
lean body mass, the nitrogen in which may be excreted as urea)." |
| Entered by |
Uri M |
| ID |
111261 |