[Closed] How much weight do YOU lose overnight...?

Are you crapping in the bed?

yeah but i don't know how or why and i doubt it's all sweat or cells.... but ... well, i dunno.

For me it's around 3lbs.

I've always thought it is due to food being digested and fluids not being topped up overnight.

Carbon dioxide, you are destroying the planet in your sleep.

I can shed 1st & 2lbs by visiting the lil boy's room per week

It's your soul.

It's slowly re-absorbed into your body as you wake.

Coupe of lbs here. Which is frustrating, as I seem to need to do about the same amount of time on zwift to lose a similar amount. Must be doing laps of alpe du zwift in my dreams...

How many grams in a danger****?

Close the window. And eat more garlic.

Stripping naked and weighing yourself obsessively several times a day is probably not a good sign.

Any GP could tell you th.....oh.

How many grams in a danger****?

Depends how long since the last one.

10cc

When I looked into weight loss a while back, something suggested you breath out your converted fat as water. So although last night will have been a sweaty one, you'll no doubt have breathed a lot of that water out. Your level of hydration before bed and after sleep would be an interesting stat.

But yeah I'm roughly a kg different over night too.

When I looked into weight loss a while back, something suggested you breath out your converted fat as water. So although last night will have been a sweaty one, you’ll no doubt have breathed a lot of that water out.

That's an interesting bit of chemistry! I think what you mean is the CO2 you breathe out comes from what your body's fuel, which is both fat and sugar. There will also be a fair amount of water vapour. And yes, some sweat - more of course when it's hot.

I have seen 1kg-2kg variation between days(that’s when I used to go to the gym regularly). If you weight yourself do it weekly and after a routine event. Difference in weight could be food and water weight.

That’s an interesting bit of chemistry! I think what you mean is the CO2 you breathe out comes from what your body’s fuel, which is both fat and sugar. There will also be a fair amount of water vapour. And yes, some sweat – more of course when it’s hot.

Burning anything in general produced CO2 and water as carbon, fat and protein are all mostly carbon and hydrogen atoms (protein adds nitrogen to the mix which is why you piss out urea). In general though it's harder to measure as your lungs are evaporating water all the time anyway.

That’s an interesting bit of chemistry! I think what you mean is the CO2 you breathe out comes from what your body’s fuel, which is both fat and sugar.

Fats and Carbohydrates are made from Carbon, Hydrogen and Oxygen. When you are breathing out CO2... where is the Hydrogen going? We exhale more H20 than we do CO2.

Interestingly we also exhale 95% of the oxygen we inhale. We know how important the oxygen is to keep us alive but its a surprise to think what a small proportion it is of the air we breath and how little of that we then actually use.

Fats and Carbohydrates are made from Carbon, Hydrogen and Oxygen. When you are breathing out CO2… where is the Hydrogen going? We exhale more H20 than we do CO2.

Er yeah, that's why I said there was a fair amount of water vapour too. I was replying to this comment "you breath out your converted fat as water" which didn't make much sense unless we've all got nuclear reactors inside us converting carbon to oxygen or hydrogen...

Stripping naked and weighing yourself obsessively several times a day is probably not a good sign.

Ha! True...but it's a new toy, and I like looking at figures (fnar fnar...!)

And what's been said 'up there' about losing weight via breathing is true... when you think about it, when you lose weight you don't see chunks of fat falling off the body.. the process of respiration converts our fuel into energy (ATP) and the waste products of CO2 and H2O... which we breath out..

You then get into 'Moles' (the volume of a gas for it's atomic weight) and realise we are just gas/vapour producing machines...

Of course we pee and poop out weight, and sweat a lot too, but 'proper fat burning weight loss' is breathed out....!

DrP

EDIT:

I was replying to this comment “you breath out your converted fat as water” which didn’t make much sense unless we’ve all got nuclear reactors inside us converting carbon to oxygen or hydrogen…

Kreb's cycle innit...

its a surprise to think what a small proportion it is of the air we breath and how little of that we then actually use

On the other hand, it's impressive how efficient your lungs are. Every 3 to 5 seconds your lungs extract about a third of a litre of oxygen from the air, stuff it into your blood, and do something similar in the opposite direction with the CO2. Getting 5% of the available O2 in that time is pretty good.

You will breathe out acetone as a fat breakdown product, frm the glyceride. You can sometimes taste it after exercise.

10cc

Every night?

Why would anyone care how much they weigh unless they have an eating disorder?

One sleepless night I actually worked out how much weight you lose overnight due to metabolism. I estimated the number of breaths, lung volume and difference between oxygen and carbon dioxide concentration in inhaled and exhaled air, then it's a relatively easy calculation using van Der Waals law. I can't remember what the answer was, but it wasn't very much. Most of your overnight weight loss is due to water loss.

I can’t even remember the last time I weighed myself! Probably when I last had to put air in my forks. So I have no idea

funny that, i only weighed myself last night for the first time in ages after watching that harrys heros tripe on the tv. was pleasantly surprised to be a good 5kg less than i would have guessed!! so much so i did it again when i woke up and was another 1.5kg lighter!?

Why would anyone care how much they weigh unless they have an eating disorder?

Well...erm...I care. And I DON'T have an eating disorder.
So I guess there must be other reasons - health..track gym progress...see if the diuretics and EPO are working... track my pregnancy....
Funny that... #rolls-eyes

DrP

Usually just under a kg.  I assume I fart a lot at night.  It's fairly consistant too

Every day's a school day! Some interesting stuff on here

Always about a kg for me. Its also roughly about 0.1kg/hour all the time even during the day if when I'm not eating. But even a small meal adds a surprising amount of weight.

I sleep-eat*, so probably gain 😬

*Jam sandwiches, apparently (as evidenced next morning by strawberry jam on the pillow and bread crumbs on the kitchen-counter)

https://journals.physiology.org/doi/full/10.1152/advan.00028.2005

The only good use of those scales is to understand why the toilet is blocked again 🙁

When I was preparing my Froome defense, I collected my own urine volume every day for three weeks. I also looked at fluid balance. You really do make 1ml/kg/hr in a resting state. Sad I know.

Ok so unrelated but related, can anyone answer this - I was pondering how much I sweat out after a long hot bath, so did a before and after weigh-in on the scales (can’t recall what the reduction was but it was quite a bit) BUT then drank 2 pints of water in quick succession to replace fluids and then weighed myself again - no increase! What’s going on there then? Reasonablly sensitive digital scales so assume they’d pick up a ~1kg increase in weight...

Interesting question, I had just presumed it was inaccurate scales!

Apparently an average person produced about a kilo of co2 per day, (and it can be 8x that during exercise). If we assume that you sleep for a 1/3 of the time that’s 333 g/CO2 per night. The C part of that is inside you - let’s assume you are purely metabolising carbs (cellular respiration of glucose) - then one glucose molecule becomes 6 molecules of co2. 333g co2 is pretty much 6.7 moles of co2, so produced from respiration of 1.1 moles of glucose - which is about 0.2 kg which you will lose just by living.

If you are losing more than this it’s probably sweat.