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Changes in weight can be difficult to measure. Your weight is not static, it fluctuates throughout the day depending on your meals and daily activity. In addition to this daily fluctuation, your weight may also increase or decrease a few pounds over the course of the week due to factors unrelated to weight gain or loss.

Ideally, to get a sense of your weight, weigh yourself at a standard time and wear standard clothing. For example, the suggestion is that you usually weigh yourself first thing in the morning after you go to the bathroom but before you have breakfast.

Even then, for reasons unrelated to either a calorie deficit or excess, your weight can fluctuate by a few pounds either way. This can be especially frustrating if you’re actively trying to gain or lose weight, or if you’re competing in a sport that requires a weigh-in for competitions, when even a small amount of weight gain can be frustrating.

With that in mind, here are a few reasons your weight can fluctuate from day to day.