Why do we weigh less after a night's sleep?

CalorieGuru

Surely you're all familiar with the phenomenom: you notice that you weigh less in the morning then you did the night before. But why? It doesn't make any sense to me. What do we lost in those 7 hours of sleep?

Note: This is assuming you don't use the washroom or eat anything between the night and morning weigh-ins.

DrWhoodles

Ghosts

seltzermint555

Ghosts

QFT

kjw0528

No salt or water during the night?

jabbruz777

It takes a lot of energy just to meet your basal metabolic needs for your organs to function even at a low level over say 8 hours. Since you're not eating anything, you're not replenishing that energy expenditure.

toddis

This video explains it all. http://www.youtube.com/watch?v=lL2e0rWvjKI

IIRC, you basically are losing weight through breathing out carbon...or something.

CalorieGuru

This video explains it all. http://www.youtube.com/watch?v=lL2e0rWvjKI

IIRC, you basically are losing weight through breathing out carbon...or something.

Thanks for helping answer the question!

DrJenO

Can't view the video on my phone, but it's mostly evaporative (water) losses, also called insensible losses, from breathing all night without taking in any liquids.