Citrus Fruits
Citrus fruits include orange, lemon, grapefruit, etc. This kind of fruits contains a large number of bioflavonoids, which can enhance the activity of certain enzymes in human skin, lung, stomach and liver, and change the fat-soluble carcinogenic substance into water-soluble, so as to make them not easy to be absorbed and can be expelled out of the body. At the same time, they can enhance the absorptive capacity of vitamin C by the human body. Vitamin C is an important cancer substance, which can enhance human immunity, prevent the formation of nitrosamines–a strong carcinogen. What’s more, it also has certain effect in the prevention and treatment of gastrointestinal cancer.
A study published a few years ago in the journal Nutrition and Cancer, for instance, found that people who consume the highest amounts of flavonoids and proanthocyanidins, a subgroup of flavonoids, were 44 percent less likely to develop oral cancer, 40 percent less likely to develop laryngeal cancer, and 30 percent less likely to develop colon cancer compared to others.