Originally Posted by
gregf83
My understanding is that 1g of glycogen bonds to 4g of water. This explains much of the weight loss after a big ride where you can burn through 500g of glycogen and lose an extra 2kg of water. This doesn't explain your water loss a couple days later though.
I commute a couple of hours every day so don't notice any particular ups and downs unless I change my salt intake.
For me to experience this there has to be an exertion beyond the norm, a ride that pushes me (from what I can tell). The whole thing catches me off guard though I can bet it will occur at night.