Dehydration is a major cause of headaches, explains Stella Warkaski, BS, CN, a nutritionist in private practice in Laguna Beach, California. So instead of popping a pain pill next time your head throbs, consider reaching for water-rich foods, like watermelon. “The natural water contained in both fruits and vegetables contains essential minerals, like magnesium, that are key in headache prevention,” she says. Try this tasty, hydrating watermelon smoothie: In a blender, combine 2 cups seeded watermelon chunks, 1 cup cracked ice, ½ cup plain yogurt, a drizzle of honey and ½ tsp grated ginger. Blend and enjoy. (Bonus: The ginger can help ease headache-induced nausea symptoms!) Other foods with high water content include berries, cucumber, melon, soups, oatmeal, tomatoes and lettuce.