Cucumber

Cucumbers are more than 95 percent water and nearly 4 percent carbohydrate by weight. They provide vitamins A, C, and K; folate and other B vitamins; carotenes; and the minerals calcium, potassium, and magnesium. They are an excellent hot weather snack, because they provide both water and electrolytes to help with hydration and blood pressure.
The compound that makes cucumber slices a kitchen remedy for puffy eyes is believed to be caffeic acid. Found in many plants, it is especially accessible in cucumbers and has been shown to be an antioxidant. It has also shown potential to inhibit the growth of cancer cells in laboratory studies.
Nutritional Facts :
One cup of raw cucumber slices, with the peel, provides 16 calories, 3.8 g carbohydrate, 0.7 g protein, 0.1 g fat, 0.5 g dietary fiber, 109 IU vitamin A, 3 mg vitamin C, 7 mcg folic acid, 153 mg potassium, 25 mg phosphorus, 17 mg calcium, and 14 mg magnesium.