Not drinking enough water causing weight gain?

No.

Actually..... it is technically possible..... If you have a diet very high in sodium, that causes water retention, which can add a pound or two..... And as silly as it sounds, the best way to lose water weight, is to actually increase your water intake..... (and decrease the sodium) So if you suddenly were cut back on your water intake, the same time as increasing your sodium intake, you could very well gain a pound or two...

So yes, technically I would say it could cause weight gain or water retention, but sodium I think plays a pretty big role as well..

On a side note: I'd like to mention, I hate drinking water, and I have managed to lose a little bit of weight personally, without really drinking *any* water.... I know, it's horrible but I live on diet sodas lol.... I don't think we need as much water as the 8 cups per day claims.. that doesn't take into account the water we get from foods or other fluids.....

On a side note: I'd like to mention, I hate drinking water, and I have managed to lose a little bit of weight personally, without really drinking *any* water.... I know, it's horrible but I live on diet sodas lol.... I don't think we need as much water as the 8 cups per day claims.. that doesn't take into account the water we get from foods or other fluids.....

The eight cups a day claim actually means 'any liquid that hydrates you' - and that includes tea and coffee, soda, juice etc. etc.

No it will not lead to weight gain. Water retention is temporary, not something that will last for several weeks, as the body is extremely efficient at regulating itself. If you were dehydrated enough to actually put on a substantial amount of water weight, you'd be dead by the time a couple weeks had passed.