Interesting!

Please elaborate on the purpose of minute-to-minute body weight data over a day.

Hi Aaron,

My research was about weight flutuctuation during sleep and awake rest. What I found was that the lowest weight in a 24 hour period is immediatly after o person wakes up. It decreases gradually during sleep, faster during the firs hour. During the day a person generally gains weight after meals, loses after urinating, sweating or defecting (that is quite obvious! But weight loss during sleep is not obvious).

"But weight loss during sleep is not obvious"

Loss of water through breathing and perspiration seem pretty obvious, not to mention some drop due use of energy in involuntary activities in the process of living. 

Hi Tausif,

" seem pretty obvious"

These processes occur both during sleep and vigil. It is no way obvious that there is a HUGE weight loss during sleep and that the minimum weight is when we wake up. Classically sleep is considered an energy saving state and such an expressive weight loss supposes a high energy expenditure.

Please revise literature on this topic.

Walter,

Please define HUGE!

"These processes occur both during sleep and vigil."

During the day, most people consume (or at least are supposed to consume) about 2 liters of water, which is removed through the system via multiple means. Breathing alone accounts for about 800ml/day water and 300gm/day carbon. This does not include perspiration.  

Given that one doesn't typically wake up during the night time to have multiple drinks of water to replenish the loss, a significant difference in weight at the time of going to sleep versus waking up doesn't seem too mysterious.

Perhaps I should have stated obvious, because it is a relative term.

"Given that one doesn't typically wake up during the night time to have multiple drinks of water to replenish the loss, a significant difference in weight at the time of going to sleep versus waking up doesn't seem too mysterious."

Is there raw data anywhere on the difference between nighttime weight loss and daytime weight loss while controlling for water intake?  Because that's what I'm about to do in the next few days and it would be nice to know whether I'm rediscovering the wheel here.

Aaron,

Sorry, I have not done any literature searches but you should certainly do so... lest you end up reinventing the wheel.  ;)

I should expect that this information may be out there for quite some time - finding it may be hampered by the fact that not old literature may have be digitized or made easily available but do, at least , make a serious attempt. 

Best,

To Tausif and Aaron

"doesn't seem too mysterious"

I am not going to give you right now my unpublished results butI can tell you that for most individuals weight loss per minute during sleep is faster than during awake rest in similar conditions (no physical activity, no food or drink intake, no defecation, no urination, controlled room temperature). For me it is quite surprizing.

"Wonder is the special affection of a philosopher; for philosophy has no other starting point than this."  (Francis Bacon)