The main source of vitamin A is animal food, which is commonly known as meat food, mainly animal offal, liver, kidney, cod liver oil, milk and milk products, eggs, etc. Plant foods are vegetarian foods, which contain the precursors of vitamin A, carotene. Mainly present in green and yellow fruits and vegetables, such as spinach, carrots, pumpkin, mango, apricot, papaya, etc. There are also some mixed grains, such as corn, millet, white potatoes also contain relatively rich carotene, which can be converted into vitamin A in our body.