Drinking the same amount of water

Maria is really wondering how water could be involved in weight loss or even more in her pain of osteoarthritis. She cannot see the connection. So she is not making any changes in how much water she is drinking everyday. It's not making any sense. 

But time goes by and even though she tries to lose weight, she really trains and is making an effort there seems to be something holding up her metabolism. 

Her nutritionist has some insights on the matter and she is not really sure if there is a point in changing anything. Feels a bit frustrated.