Fluids definitely can help with overeating. For one, they make you feel full. But more importantly, often your body can't distinguish whether you're dehydrated or hungry so people assume that they're hungry when really they need fluids.
THIS^^^^^^
I have lost weight, but the first week I was "hungry" and I was actually dehydrated. We are not kidding when we tell new members to DRINK LOTS OF WATER. Much more than you think you want. I don't go anywhere anymore without a bottle of water in my purse.