Lemon water is claimed to have powerful health and weight loss benefits. In fact, many celebrities swear by it and there are even diets based entirely on lemons. But does it live up to the hype? This article uses scientific evidence to explore the benefits and myths of lemon water. What is Lemon Water? Lemon water is simply the juice from lemons mixed with water. The amount of lemon you use depends on your personal preference and this drink can be enjoyed either cold or hot.