It might take some experimenting to see what works for you. Some people swear by weighing in monthly, or weekly.
The fluctuations are the exact reason that I weigh myself almost every morning (just forget some days) after I pee and before eating or drinking. This way, I've gotten used to ~2 pound fluctuations from day to day, and will catch any unusual upward trend in weight quickly. This eliminates the chance for weight to just be up due to factors the other posters have cited on the set weigh-in day leading me to think I've gone off track somehow. It takes time to burn fat, while increases in weight due to water retention can show up on the scale after a workout, especially heavy strength training. Last week I started incorporating some heavy lower-body ST, and my weight popped up by 3 pounds and stayed there for about 3 days before it dropped back to normal.
Nothing's ever gonna' stand in our way again. ~Wilco
|5 Days until: High Desert Half Marathon