Water makes up about 60 percent of your body weight. Foods with a high-water content keep you hydrated. You get roughly 20 percent of your daily water intake from food, according to the Institute of Medicine. Foods with a high-water content provide volume but deliver fewer calories. This means you can eat more of these foods without greatly increasing your caloric intake. In addition, foods with a rich water content typically contain electrolytes, which help to keep the body's fluids balanced.

When it comes to water content, fruits and vegetables take the crown. A diet rich in fruit and vegetables not only helps keep you hydrated, but it provides vitamins and minerals as well. Fruits with a water content of 90 percent or higher include cantaloupe, grapefruit, strawberries and watermelon. Other fruits with a high-water content include cranberries, raspberries, pineapples, plums, oranges, pears, apples and blueberries. Vegetables also contain large quantities of water in proportion to their weight. Good options include cabbage, spinach, squash and turnips.