What we know is that the pH scale ranges from 0-14 with anything less than 7 considered acidic and 7 and above alkaline. Watermelon (seedless or not is unknown) has a pH range of 5.18-5.60 and is a lower acidic fruit than other options. However, it’s important to consider the health benefits of eating fruit before nixing them from your diet because of pH levels. There is a claim that alkaline-producing diets counteract acidity and help the body regulate its pH. However research on this topic is very limited. Fruits provide and abundance of vitamins, minerals, antioxidants and fiber which are all crucial for body function and health. Before making any changes, talk with your doctor about the benefits and risks of limiting a food group.