Foods That Hydrate: Spinach
Water content: 91.4% water
Iceberg lettuce may have a higher water content, but spinach is usually a better bet overall. Piling raw spinach leaves on your sandwich or salad provides nearly as much built-in hydration, with an added nutritional punch.
Spinach is rich in lutein, potassium, fiber, and brain-boosting folate, and just one cup of raw leaves contains 15% of your daily intake of vitamin E—an important antioxidant for fighting off the damaging molecules known as free radicals.