When a person feels thirsty, he is already mildly dehydrated. Symptoms of dehydration include dry mouth, fatigue, no urine or dark urine, headache, confusion and dizziness, according to FamilyDoctor.org. People should drink at least eight glasses of water a day and more if they sweat a lot. In addition to water, there are a number of hydrating foods.Fruits

According to BreastCancer.org, some fruits are made up of 90 percent water and eating these fruits can help overcome dehydration. While all fruits contain high amounts of water, some contain more than others. Fruits that contain high amounts of water include watermelon, grapefruit, cantaloupe, berries and bananas. Veggies

Similar to fruit, vegetables can provide a person with a substantial amount of water because they are made up of a significant amount of water. BreastCancer.org suggests eating the following vegetables to help overcome dehydration: broccoli, celery, cucumbers, lettuce, sweet peppers, spinach, zucchini, tomatoes, radishes, cabbage or cauliflower. Yogurt

When a person becomes dehydrated, she loses electrolytes in addition to the overall water that is lost. Therefore, when eating to overcome dehydration, yogurt is a helpful food choice. Discover Health says that yogurt contains substantial amounts of potassium and sodium, which will help replace the electrolytes that have been lost.