In a survey for The Truth About Food, 85 percent of people think they should drink at least a half-gallon of water each day to keep their skin looking young. So they created an experiment to put that myth to the test!
Susie and Alice are twins who like to drink a lot of water. "I probably get through about at least a liter, a liter and a half of water a day, because it does make a difference to my skin," Alice says.
To determine whether water really does make a difference, researchers first measured the moisture, elasticity and oiliness of each girl's skin. Over the next week, the twins ate the same diet-except Alice drank plenty of water, and Suzie drank no water.