Why are these scientists right about drinking water....and wrong about low carb?
Consider the source.
Myself, I noticed better mood, clearer skin, and other benefits when I started drinking more water. Many times thirst is mistaken for hunger in some people. And water consumption studies presuppose that people start out with proper hydration...which is maybe not accurate.
The pillows in your joints and vertebra float on water. Your brain chemicals require water to perform their little chemistry miracles. And of course your kidneys need something to work with.
As my water consumption increased, I noticed more people seemed to have symptoms that I no longer had...dry and irritated eyes, or vague backaches, or stomach upsets that do vanish with proper water consumption.
What's proper for each person may vary.
Here's a website, (though anyone can take it with a grain of salt

http://www.watercure.com/