Broccoli and Carrots are Better for Eye Health than Pork Liver
The Vitamin A required by the human body can not only be directly obtained from animal-based foods but can also be converted from beta-carotene found in plant-based foods. There is ample evidence that the efficiency of beta-carotene converting into Vitamin A is sufficient to meet the body's needs for Vitamin A.
Moreover, most importantly, the beta-carotene that is not converted into Vitamin A also has other important physiological functions. It has antioxidant effects, which are significant for preventing cardiovascular diseases, tumors, and slowing down aging. In other words, beta-carotene not only converts into Vitamin A but also has antioxidant effects that Vitamin A does not possess. Therefore, foods rich in beta-carotene, such as vegetables like broccoli, carrots, pumpkin, chives, spinach, tomatoes, shepherd's purse, and sweet potatoes, as well as fruits like citrus, are the best sources of Vitamin A.
In comparison, foods rich in Vitamin A, such as animal liver and other organs, egg yolks, and lean meat, contain relatively high levels of cholesterol or saturated fat. Therefore, it is not wise to eat more pork liver for eye health. One should eat more fresh, dark-colored vegetables and fruits.