Why does your weight go up and stay up for a while if you eat just

[laundry_queen]

11. That's why I weighed myself daily

or sometimes even twice/day and averaged the number. This kind of desensitized me to the numbers. Then at the end of each week I'd average out my weight. After a few weeks, I started making a graph and could see the downward trend. This made more sense to me than only weighing once/week. That 'once' could be the day you are carrying 5 extra pounds in water weight. If you do an average instead, you don't freak out so much when you see 'ack 5 extra pounds!' You kind of get used to seeing those fluctuations all week long.
YMMV of course, you are right, it is different for everyone. Just wanted to share my experience with it because for so long I felt I was breaking some sort of commandment if I weighed myself, say, twice/week, and it just added to guilt/inadequacy feelings. Sounds silly, but wanted to share anyhow.