The yellowing of cauliflower indicates that it is not fresh and has been stored for too long. The biggest danger in vegetables comes from nitrate. Nitrate itself is not toxic, but after storage for a period of time, nitrate is reduced to nitrite due to the action of enzymes and bacteria, which is a toxic substance.

Fresh vegetables should be eaten as soon as possible after they are bought. The nitrate content in leafy vegetables is high, especially it can't be eaten for a long time. If you buy vegetables that are not cooked on the day, you should put them in fresh-keeping bags in time and put them in the refrigerator for temporary storage. All leafy vegetables that have been yellowed and waterlogged have a very high nitrite content and must not be eaten.

Extended data:

1, rich dimension k

Some people's skin will turn black and blue once they are hit and hurt a little, because they lack vitamin K. The best way to supplement is to eat more cauliflower.

Step 2 detoxify the liver

Regular consumption of cauliflower can also strengthen the blood vessel wall and make it difficult to rupture. Moreover, cauliflower is also rich in vitamin C, so eating cauliflower can not only enhance the detoxification ability of the liver, but also effectively improve the various immune abilities of the human body, and also have a certain preventive effect on colds and scurvy.

3. Prevention and treatment of gastric cancer

The content of vitamin C in cauliflower is extremely high, which is not only beneficial to human growth and development, but more importantly, it can improve human immune function, promote liver detoxification, enhance human physique, increase disease resistance and improve human immune function. Especially in the prevention and treatment of gastric cancer and breast cancer.

Studies have shown that the serum selenium level of patients with gastric cancer is significantly reduced, and the concentration of vitamin C in gastric juice is also significantly lower than that of normal people. Cauliflower can not only supplement a certain amount of selenium and vitamin C, but also provide rich carotene, which can prevent the formation of precancerous cells and inhibit the growth of cancer.

Deteriorated food not only changes in appearance, but also loses the color, fragrance and taste quality of the original food, and its nutritional value will also decrease, and it will also contain corresponding toxins harmful to human health.

People's Network-How to Choose Good Cauliflower with High Nutritional Value

People's Daily Online-Vegetables: If you buy yellow-stained leafy vegetables, you can rest assured not to eat them.