Toona sinensis is a new bud that grows on Toona sinensis in spring. Many places have the custom of "biting spring", and there is even a folk custom that it is not spring without eating Toona sinensis. China has been eating Toona sinensis for nearly a thousand years, and it is the only country in the world that eats Toona sinensis. Toona sinensis trees were planted in the north and south. Many people can't stop the smell of Toona sinensis, but some people stay away from Toona sinensis and can't accept it.
So can Toona sinensis be eaten? Is Toona sinensis poisonous or not? What is its nutritional value?
The ancients believed that Toona sinensis had the functions of tonifying deficiency, strengthening yang, tonifying kidney, promoting hair growth, promoting qi circulation and regulating blood. In the concept of traditional Chinese medicine, Toona sinensis belongs to hair, which is easy to cause recurrence of old diseases and aggravate the condition. So what is the nutritional value of Toona sinensis?
First of all, the protein content of Toona sinensis is 1.7g/ 100g, which is relatively high in vegetables. The fat content is only 0.47 g/100g; Carbohydrate 10.97g/ 100g is not high; Dietary fiber is as high as1.8g100g, which is similar to Chinese cabbage, so Toona sinensis is a low-energy food.
Toona sinensis contains more nutrients such as vitamin C, potassium, calcium and zinc, and the calcium content is almost the same as that of milk. From this point of view, Toona sinensis is really beneficial to human health, but compared with other fruits and vegetables, its nutritional value is not so prominent, and it can be replaced by other foods.
The reason why Toona sinensis is so expensive is that it tastes unique and rare. In spring, the price of Toona sinensis can reach a catty in 90 yuan, especially the tender Toona sinensis of the first crop, which sells at a higher price. After Grain Rain, the viewing period of Toona sinensis has passed, and Toona sinensis can be eaten only for a short month in a year, which is naturally expensive.
Now, there are artificially planted Toona sinensis trees all over the country, and Toona sinensis is not as rare as before. Although the taste appreciation period of Toona sinensis is still so short, the output has come up, and everyone can buy it according to their own tastes, without excessively pursuing the nutritional value of Toona sinensis.
Since Toona sinensis is a nutritious vegetable, why is someone poisoned? There are two main reasons.
1, nitrite poisoning
Toona sinensis buds contain nitrite. When nitrite is eaten, it will be converted into nitrosamines in the body. A large amount of nitrosamines can cause nausea, vomiting, dyspnea, purple lips and other symptoms, which can lead to death in severe cases. Moreover, nitrosamines are carcinogens, and long-term small intake can also induce cancer.
Nitrite in Toona sinensis bud is related to its freshness. The researchers tested Toona sinensis in the market and found that the nitrite content of tender Toona sinensis was1.475 mg/kg. /kg。 The nitrite content of some Toona sinensis is 2.778mg/kg, and that of old Toona sinensis is 7.5mg/kg.
The more tender Toona sinensis is, the lower the nitrite content is. WHO and the daily allowable intake is 0. 1.3 mg/kg body weight, that is to say, it is safe for an adult weighing 50 kg to consume 6.5 mg nitrite every day, which is 860g Toona sinensis when converted into old Toona sinensis.
Simply put, it is safe to eat no more than 3 taels of Toona sinensis at a time. Of course, this is limited to fresh Toona sinensis. The nitrite content in pickled Toona sinensis is as high as 40mg/kg, so it is not recommended to eat it to avoid poisoning.
2, allergic poisoning
As a wild vegetable, Toona sinensis has its own unique taste. But not everyone can eat it. Wild vegetables are not artificially cultivated vegetables, and there are many natural plant ingredients. If many people are naturally allergic to Toona sinensis, they can't eat Toona sinensis.
The Qihe Morning Post reported that the family picked the Toona sinensis and pickled it for consumption. Unexpectedly, two hours after eating Toona sinensis, my tongue was numb and very uncomfortable. For people who are in contact with Toona sinensis for the first time, it is best to taste it first. If there is nothing unusual, you can rest assured to eat.
There are many allergic events caused by natural plant ingredients, especially plants that have not been artificially cultivated, which are easy to cause allergies. The main symptoms are itchy skin, rash, swelling of mouth or face, etc. Even artificially planted vegetables and fruits can cause allergies, which can easily lead to life-threatening if they cannot be avoided in life.
For example, Europeans and Americans are allergic to peanuts, while China people are allergic to seafood. If you don't know, eating by mistake will have serious consequences. So is Toona sinensis.
There are many ways to eat Toona sinensis, such as Toona sinensis eggs, Tofu Tofu Tofu, Tofu Tofu Tofu, Tofu Tofu Tofu, Tofu Tofu Roll and so on.
First of all, try to choose tender Toona sinensis, and you can check it when you buy it. The leaves of tender Toona sinensis are brownish red or yellow, and the green Toona sinensis is old. Try to buy Toona sinensis with short and thick stems, which has just grown out. You can smell it, too Is it fragrant? If it smells bad, it's Ailanthus altissima, and you can't eat it. Old Toona sinensis has high nitrite content, poor taste and low edible value.
Secondly, before we eat Toona sinensis, we must wash it with clear water and then blanch it with clear water. Although many people think that the smell of Toona sinensis is not good, it is a very good way to avoid Toona sinensis poisoning.
Studies have shown that the nitrite content of Toona sinensis will drop to 65438 0.4 mg/kg after blanching for 20 seconds. Greatly improve that food safety. And will not cause too much damage to the nutritional value of Toona sinensis. The boiled Toona sinensis can be cooked in cold salad, stir-fried and other cooking methods.
Finally, some friends like pickled Toona sinensis. As mentioned earlier, the content of nitrite in pickled Toona sinensis is as high as 40mg/kg, which is not recommended for everyone, but if you like pickled Toona sinensis very much. It is recommended that you marinate for at least 3 weeks to ensure that the nitrite content of Toona sinensis drops to a safe level.
When we buy seasonal vegetables, we should buy them according to our own situation. Don't pick wild vegetables yourself to avoid food poisoning.