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3. Guavas

Guavas contain at least twice as much vitamin C as oranges and are also a significant source of vitamin A. This preformed vitamin, which eventually becomes retinol, not only improves eyesight but may even prevent its degradation. Also, a single fruit has as much potassium as a banana, and the leaves of the guava plant are rich in antioxidants that fight free radicals.

guavas retinol orange oxidative stress THEPALMER / Getty Images

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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.