First of all, when we sweat during exercise, we will lose a lot of water and electrolyte, which will lead to our weight loss. When we drink water, especially when we drink a lot of water, water will be quickly replenished to our bodies, so that our weight will recover or even exceed the original weight. This is because the density of water is less than the density of electrolyte and energy substances we lose, so when we drink a lot of water, we will recover more weight instead of recovering the lost energy substances.
Secondly, the way of weighing will also have an impact on the results. After drinking water, we gain weight mainly because water intake increases the water storage in the body, not because we gain the weight of other tissues such as fat or muscle. Because the density of water is less than that of fat and muscle, it is lighter at the same volume. Therefore, although we may drink a lot of water, our weight may still look higher than before.
Generally speaking, drinking water will not lead to weight gain, but the weight change after drinking water may be affected by many factors, including water intake, the way of measuring weight and the state of water balance in our body. Therefore, in order to correctly evaluate our weight changes, we need to comprehensively consider these factors, rather than just focusing on the impact of drinking water on weight.