My weight is going up and down all the time... The difference between the days is 2-3 pounds and it's changing EVERY DAY. It's not the PMS, it's not the food (I eat almost one and the same thing) and I don't know what it is. I count calories and I keep them down to 2000 while I tend to burn 2500 but I haven't seen a steady weight decrease.
Well, my workouts are very different. For example from ten and a half hours biking on Saturday to half an hour swimming today and half an hour home workout (squats, push-ups, planks). Maybe the endurance workouts get in the way because I had to fuel the 230 km 40 dgrees F winter ride and then my muscles became full with water.
If I eat less than 2 000 calories I starve and I don't want to starve my body because I remember from last winter that I lost weight thanks to a fat burner but then when my season started, I began intensive training and racing for which I needed fuelling and recovery so I gained everything back.