If it bothers you too much then don't but it is because of the fluctuations that weighing often can make sense. Say you lose a pound a week but your weight bounces up and down in a 3 pound range. If you weigh often you can note the trend - the weights are bouncing around a lower number. But if you weigh once a week you might catch a low bounce and then a week later it might be on a day with high spike caused by water. You could end up thinking you gained a pound when you actually lost one and get really discouraged.