Is it? If a body is retaining additional water and absolutely nothing else, it can be the result of consistent changes in external temperature, a lack of micron

Is it? If a body is retaining additional water and absolutely nothing else, it can be the result of consistent changes in external temperature, a lack of micronutrients, or a result of illness. In the absence of these, the amount of water in the body remains quite consistent. I'm not talking about water that comes with glycogen as part of an unexpected calorie surplus, because that is not permanent. You are correct that water weight can cause spikes in weight measurement, but this is just a contributor to weight as a noisy measurement, not an example that it is not helpful.