If you eat watermelon in the evening, be prepared for a night of stomach rock 'n' roll. This can lead to restless sleep and feeling unwell the next day. Additionally, watermelons are known as strong diuretics, causing frequent trips to the bathroom. This applies to all citrus fruits and cranberries as well, but it's particularly prominent with watermelons.
Since watermelons contain a lot of fiber. These are substances that the human digestive tract cannot fully break down, leading to a cleansing effect that demands full engagement from the metabolism. Instead of processing all the food eaten during the day, the intestines need to focus on the watermelon, so avoid eating them at least 2 hours before bedtime.
It's a different story with watermelons during the day when you are active, moving around... 100 grams of watermelon contain only 184 calories, fill your stomach, reduce hunger, and are packed with minerals and vitamins. Watermelons are an ideal daytime snack in the summer.