It belongs to the same plant family as squash, pumpkin, and watermelon (the Cucurbitaceae family). Like watermelon, cucumbers are made up of mostly (95 percent) water, which means eating them on a hot summer day can help you stay hydrated.
However, there's reason to eat cucumbers all year long. With vitamin K, B vitamins, copper, potassium, vitamin C, and manganese, cucumbers can help you to avoid nutrient deficiencies that are widespread among those eating a typical American diet.
Plus, cucumbers contain unique polyphenols and other compounds that may help reduce your risk of chronic diseases and much, much more.