On average, the human body needs 35g of water per kilogram of body weight per day, which corresponds to a volume of water of between 2.5 and 3 liters per day.
An American study by the American Chemical Society found that adults who drink water before each meal consume less calories during the meal and therefore lose weight more easily.
Dehydration would impede the proper functioning of our brain, which would lead to problems of concentration or memory loss.
Video: Take stock of your water needs! http://vimeo.com/34212246