Weight loss
Water is one of the best tools for weight loss, first of all because it often replaces high-calorie drinks like soda, juice and alcohol with a drink that doesn't have any calories. But it's also a great appetite suppressant, and often when we think we're hungry, we're actually just thirsty. Water has no fat, no calories, no carbs, no sugar. Drink plenty to help your weight-loss regimen.

Energy
Being dehydrated can sap your energy and make you feel tired -- even mild dehydration of as little as 1 or 2 percent of your body weight. If you're thirsty, you're already dehydrated -- and this can lead to fatigue, muscle weakness, dizziness and other symptoms.

Headache cure
Another symptom of dehydration is headaches. In fact, often when we have headaches it can simply be a matter of not drinking enough water. There are lots of other causes of headaches, of course, but dehydration is a common one.

Healthy skin
Drinking water can clear up your skin and people often report a healthy glow after drinking water. It won't happen overnight but just a week of drinking a healthy amount of water can have good effects on your skin.

Digestive problems
Our digestive systems need a good amount of water to digest food properly. Water can also help to decrease constipation (possibly a result of dehydration).

Cleansing
Water is used by the body to help flush out toxins and waste products from the body.

Better exercise
Being dehydrated can severely hamper your athletic activities, slowing you down and making it harder to lift weights. Exercise requires additional water, so be sure to hydrate before, during and after exercise.