It’s a legend that many long for, that dates back to the 16th century when Spanish explorer Juan Ponce de León was in search of a magical spring called the Fountain of Youth, touted to restore the youthfulness of anyone who bathes in, or drinks, its waters. In modern times, it’s been touted that just plain water, perhaps, is the true fountain of youth that can do everything from reverse the signs of aging to help you drop those last 10 pounds. But is it as simple as eight glasses a day, or is that water you are guzzling being done so in vain?