four, tea
a long time, most of the vitamins have been lost, and the protein in the tea soup, sugar and so on will become bacteria, mold breeding feed.
five, green leafy vegetables
there are many nitrates in some green leafy vegetables. If the time is too long after cooked, the nitrate will be reduced to nitrite under the decomposition of bacteria, and the nitrate will be reduced to nitrite. Cancer can not be removed by heating.
six, tremella
there are more nitrate in the field of silver fungus cultivated in indoor and Tilia wood. After boiled for a long time, under the decomposition of bacteria, nitrates It will be reduced to nitrite.