Is it normal to see 0.5-1.5kg weight gain in a 24-hour period?

Yes. It’s typical for a person’s weight to fluctuate by 0.5-1.5kg each day. These changes occur because of daily water retention and the weight of the food in your gut. For most accurate results, weigh yourself in the morning before eating or drinking anything. As long as you are seeing consistent weight loss week to week, there is no need to be worried.