1. Kiwi fruit:
Kiwi fruit contains a variety of nutrients, such as sugar, protein, lipoid, vitamins, organic acids and many kinds of minerals. It is especially rich in vitamin C, and its content ranks the first in all the fruits. Every 100 grams of kiwi fruit contain about 200 milligrams of vitamin C, which is almost 100 times as that of citrus and 30 times as that of tomato. As a result, it enjoys the reputation of "natural vitamin C supplement". What's more, kiwi fruit also contains a large number of vitamin P, which has the function of protecting blood and preventing cancer.

2. Wheat bran:
In modern life, people begin to attach more and more importance to wheat bran. In order to improve their health, many western experts advise people to eat more whole grains in daily diet. is the "warehouse" of the main nutritional components of wheat. It contains a variety of nutrients, including B vitamins, minerals such as selenium and magnesium, as well as cellulose. It can prevent and treat colorectal cancer, diabetes, hyperlipidemia, constipation, hemorrhoids, and so on. As a result, many experts point out that wheat gluten is the best fiber food to prevent cancer.

3. Radish:
Radish contains a variety of enzymes, which can eliminate the carcinogenesis of nitrosamine. In these enzymes, lignin can stimulate the immunity of the body, enhance the activity of macrophage, and strengthen its ability to kill cancer cells. The spicy flavor of radish comes from mustard oil, which can stimulate the peristalsis of intestines and stomach, and promote the discharge of carcinogens. At the same time, radish also contains a lot of unknown components, which can inhibit the mutation and activity of cancer cells. The content of vitamin C contained in radish is 8 to 10 times higher than that of apple and pear. What's more, carrot is rich in carotene, which also has an excellent anti-cancer effect.

4. Pumpkin:
In some countries, pumpkin is known as "magic melon", because it can either be used as staple food or cooked into dish. Americans have the tradition of eating pumpkin at Thanksgiving, so as to express their gratitude to pumpkin. Pumpkin can not only prevent obesity, diabetes and hyperlipidemia, but also plays an important role in the prevention of cancer. What's more, pumpkin contains a high content of vitamin A, vitamin C, calcium and cellulose. More importantly, it contains some amount of tryptophan, which can inhibit the growth and reproduction of carcinogens.