Eating watermelon can help encourage easier and more regular bowel movements. Some people experience GI symptoms after eating watermelon because it's high in fructose, which is hard to digest. Eating watermelon may worsen and make it more challenging to manage flare-ups. Even those without a history of GI conditions can experience discomfort if they eat too much watermelon. They can help you decide if watermelon is an appropriate snack, and if so, how much to eat in one sitting.