Watermelon is more nutritious than I thought.
Carotene, lycopene,citrulline etc.
You can expect antioxidation effect, better kidney function, reducing swelling, prevention of cardiac disease, high blood pressure etc.
Of course, if you already have disease, please ask for doctors' remedies.
I usually sprinkle a pinch of salt. This also helps to refill inner salt which has been lost with sweat.