According to the World Health Organization, this occurs primarily in parts of Africa, Asia, and Latin America where people eat few yellow fruits, yellow vegetables, dark green vegetables, leafy vegetables, and other foods containing vitamin A.
परिणाम दिखाते हैं कि मधु एक शोधन और स्वास्थ्यकर के तौर पर विशिष्ट रूप से प्रभावकारी है ।