Yes, consumption has an effect that is 1:1 for at least some time. I drank water and coffee not long before I weighed and didn't pee enough to account for it, so I could have weighed over a pound less after paddling but I would have been dehydrated. I still think I was somewhat dehydrated. I expect my next weigh in to be above 155 but not much.

I am rolling forward 400 calories.