I've been on a low carb diet for months now, and I have noticed various weight differences from day to day when I wake up. However, the last couple of times I decided to eat a lot of carbs, I gained weight that persisted for a couple of days (about 3 lbs). I always weigh myself in the morning after using the restroom and eating a light breakfast.
Is there a known health phenomenon associated with carbs and changes in weight? Or is it more related to my body having been overweight before?