The reduction in size before weight loss suggests that as the fat is being consumed, hormonal signals are driving the body to retain water, which is more dense than fat, so weight doesn't change immediately. The body then get the message that there's too much water hanging around and mobilizes it, sending it via the bloodstream to the kidneys where it is dumped as urine.
The water that's presumably retained may come from the fat itself in two ways. Burning fat releases water that is stored along with it, and fat also produces water and carbon dioxide as it is burned, just like gasoline in an engine. The carbon dioxide is transported to the lungs and exhaled, but the "exhaust" water and the storage water released from fat burning may take longer to make its exit as it has to travel out of the mitochondria where the "combustion" takes place, into their host cells and out of the cells and into the bloodstream so the kidneys can dump it.
Another less likely possibility is that fat may be redistributed to some degree -- taken from the big depots of belly and buttocks and spread more widely among subcutaneous fat throughout the body, after which it is burned. This would imply a temporary surge in the traffic of triglycerides to enable this transport. To my knowledge this has not been studied with depot-to-depot transport in mind -- usually triglycerides are presumed to be on their way from the gut (following digestion) to storage in fat cells.
Best wishes,
Bert
Fast-5 Corporation
--- In fast5@yahoogroups.com, Laura Cody <lecody2001@...> wrote:
>
> That much I understand, but we are not necessarily growing muscle during this
> process, especially if the person isn't excercising.
>
> Laura
>
>
> ________________________________
> From: Kristina Carlton <kristina.carlton@...>
> To: fast5@yahoogroups.com
> Sent: Sun, January 2, 2011 8:15:07 AM
> Subject: RE: [fast5] Re: Checking for what is normal...
>
>
> A pound of fat takes up more space than a pound of muscle.
>
> From:fast5@yahoogroups.com [mailto:fast5@yahoogroups.com] On Behalf Of Laura
> Cody
> Sent: Sunday, January 02, 2011 5:54 AM
> To: fast5@yahoogroups.com
> Subject: Re: [fast5] Re: Checking for what is normal...
>
>
> Baranaby,
>
> You keep saying that you should measure progress with a tape measure and how
> your clothes fit rather than what the scales say.
>
> I did try to google this.. but what the hell happens to the body to cause loss
> of inches/fat while maintaining weight?
>
> Laura
>
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