How does water help you lose weight? Studies have shown that drinking water naturally boosts your metabolism, and drinking a glass of hot or warm lemon water in the morning has become a healthy daily habit for many people to assist with overall weight loss.  And not only is it an effective diet water, it tastes wonderful, too. Drink the juice of one lemon in one cup of warm water first thing in the morning (on an empty stomach) to increase your lemon water weight loss levels.