Our expert says:
Yes, there are a few things that can cause this jump. Some are really mundane - the scale may be faulty. You might have eaten more during the day, you may have had a glass or two more of water (or tea/coffee/juice...).
It's not doing less exercise though, you don't change body mass that quickly doing less exercise, so it's more likely just the timing of when you weighed in relation to when you ate. It can happen quite easily, and that's why it's important to weigh at the same time, preferably before you eat. And make sure that you use the scale the same way - even the placement on a soft vs hard surface, or on tiles that may be tilted, can affect the reading.
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