10 reasons why your weight fluctuates so much

“Being constipated can add pounds,” says Jamie Hickey, a certified personal trainer. “I know this isn’t a topic people want to discuss, but your waste adds weight to the scale, and if you haven’t been able to empty your bowels for a couple days it will add up.” Once you go to the bathroom, you should see the scale drop back down. Constipation is more likely to happen when you overhaul your diet, eat more fiber than usual or aren’t drinking enough water, Hickey adds.