As is well known, sweet potatoes are very nutritious. However, what is more valuable is that in the "ranking" of 20 anti-cancer vegetables recently released by the Japanese National Cancer Research Center, sweet potatoes also took the top spot.
Substances in sweet potatoes effectively prevent cancer
As is well known, sweet potatoes are very nutritious. However, what is more valuable is that in the "ranking" of 20 anti-cancer vegetables recently released by the Japanese National Cancer Research Center, sweet potatoes also took the top spot.
Cancer cells come from human epithelial cells, and sweet potatoes are rich in starch, carotene, and more than 10 trace elements such as potassium and iron. They can protect the structural integrity of human epithelial cells, inhibit viral activity, block the production of nitrosamines in the gastrointestinal tract, eliminate the toxic effects caused by mercury, cadmium, arsenic, etc., in food or the environment, and block the carcinogenic process of toxic metals. Sweet potatoes are called by experts the most balanced health food.
The unique dehydroepiandrosterone in sweet potatoes—a steroid hormone similar to androgen secreted by the adrenal gland—can both prevent cancer and prolong life.
Don't eat baked sweet potatoes with their skin in winter
The hot baked sweet potatoes of the moment are sweet and delicious, and some are roasted until "sugar oil" flows out. The scorched sweet potato skin is especially popular, and many people eat it along with the skin.
Experts say that it is best not to eat baked sweet potatoes with their skin, because the sweet potato skin contains more alkaloids, and eating too much can cause gastrointestinal discomfort. Especially the sweet potato skin with black spots cannot be eaten, as it can cause poisoning.
Pay attention to the time and method of eating sweet potatoes
1. Sweet potatoes should not be eaten raw
Because the cell membrane of starch in raw sweet potatoes is not destroyed by high temperature, it is difficult to digest in the human body; at the same time, when cooking sweet potatoes, the steaming time should be appropriately extended so that the "gasification enzyme" contained in the sweet potatoes can be destroyed, and after eating, you will not experience discomfort such as bloating, heartburn, belching, nausea, and flatulence.
2. It is good to eat sweet potatoes with other foods
If sweet potatoes are eaten with rice and flour, it can also play a complementary role in protein; if you also eat some pickles or fresh radishes at the same time, you can reduce the production of stomach acid.
3. It is best to eat sweet potatoes at noon
This is because the calcium contained in sweet potatoes needs to be absorbed by the human body for 4 to 5 hours after eating, and the sunlight in the afternoon can just promote the absorption of calcium. In this case, eating sweet potatoes at lunch, the calcium can be fully absorbed before dinner, and will not affect the absorption of calcium from other foods at dinner.
Three conditions must be met for eating sweet potatoes in winter
The first condition is to try not to eat on an empty stomach. Eating sweet potatoes on an empty stomach increases the chance of acid reflux and heartburn, because sweet potatoes themselves contain relatively high carbohydrates and are somewhat sweet, which increases the possibility of reflux.
The second is that it is best not to eat more than three liang (150 grams) of sweet potatoes in a day. Moreover, if you have acid reflux, you can split the three liang into several meals.
The third is not to eat sweet potatoes with overly sweet things. Sweet potatoes are sweet in themselves. If you eat them with sweet food at the same time, the possibility of reflux is doubled, so sweet potatoes should not be eaten with overly sweet food as much as possible.
Steam can destroy most of the gasification enzymes; soak raw sweet potatoes in a small amount of alkali or alum, salt water solution, and then process them into cooked food.
How to choose good sweet potatoes?
Sweet potatoes with a black-brown skin or black spots are contaminated with black spot bacteria. The toxicity of black spot bacteria can make sweet potatoes hard and bitter, and are highly toxic to the human body. Moreover, this toxin is not easily destroyed by its biological activity whether it is boiled or roasted, so it must never be eaten, otherwise the consequences will be unbearable.