Watermelon, a hydrating summer fruit, can impact blood sugar levels differently depending on whether it is consumed whole or as juice. Whole watermelon contains fiber, which slows the absorption of sugars and promotes satiety, making it a better option for individuals with diabetes or prediabetes. In contrast, watermelon juice lacks fiber and can lead to rapid spikes in blood sugar levels due to its concentrated sugar content. Research published in Metabolism Open indicates that whole watermelon positively affects blood sugar, while a study in the Journal of Diabetes and Metabolic Disorders shows that juice can cause quicker spikes. For those managing blood sugar, it is advisable to consume whole watermelon in moderation, pair it with protein or fat, and consult a healthcare provider for tailored dietary guidance. Overall, moderation and mindful consumption are key to enjoying watermelon without negatively impacting blood sugar levels.