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Changes in weight can be tricky to gauge. Your weight isn’t static, but rather something that fluctuates during the course of the day depending on things like what you ate and your daily activity. In addition to this daily fluctuation, your weight can also go up or down a few pounds throughout the week due to factors that have nothing to do with gaining or losing mass.
Ideally, to get a sense of your weight, it’s best to weigh yourself at a standard time, wearing standard clothing. For example, the suggestion is to usually weigh yourself first thing in the morning, after you’ve gone to the bathroom, but before you’ve had your breakfast.
Even then, your weight can fluctuate a few pounds in either direction, for reasons that have nothing to do with either a calorie deficit or surplus. This can be especially frustrating if you are actively trying to gain or lose weight, or if you are competing in a sport that requires weigh-ins for competitions, when even a small amount of weight gain can be frustrating to deal with.
With that in mind, here are a few reasons your weight may fluctuate from day-to-day.