Possibly, because he will be getting moisture from the vegetables.
Hamsters who have kidney issues or diabetes will drink a LOT of water, sometimes emptying their water bottle in less than a day. But remember too that weather changes can cause a behavioural change and if it feels milder, the hamster may well want to drink more. So measuring each day how many ML`s the water goes down, or how often he goes for a drink will indicate this better. x