Well the biggest benefit from lemons are its high amount of vitaminC which is great for your immune system which is great for like athletes who are more likely to get sick because of the intensive training generally ware down there immune system so lemon water is great for them plus the vitaminC can help with your mood you see lemon water help the production of serotonin which is the happy hormone which in turn makes you feel good and more energetic same as when you burn lemon oil you see the fumes help you feel happy because it raising the good hormones plus lemon water may help you lose weight too you see the lemon water helps to suppress your appetite plus generally you will drink more water if you have some lemon in it too and lemon water may help to improve insulin resistance so may help those who are at high risk of diabetes too,more to come on lemon water.