Most people prefer to buy fresh, tender, and green vegetables to cook and eat immediately, believing that doing so is beneficial to human health. However, eating vegetables that are too fresh can also lead to trouble.
New Tea
From a nutritional perspective, the freshest tea leaves do not necessarily have the best nutritional value. This is because so-called "new tea" refers to tea leaves picked less than a month ago. As these leaves have not been stored for a period of time, some substances that have adverse effects on the body, such as polyphenols, alcohols, and aldehydes, have not been fully oxidized.
If you drink new tea for a long time, you may experience uncomfortable reactions such as diarrhea, abdominal distension, and other symptoms. New tea is even more harmful for menopausal patients. Some people with insufficient gastric acid, or elderly patients with chronic gastric ulcers and hepatitis B, are also not suitable for drinking new tea. New tea can irritate their gastric mucosa, causing gastrointestinal discomfort, and can even worsen their condition.
Fresh Jellyfish
Jellyfish contains various toxic amines and toxic peptide proteins such as serotonin and histamine. When consumed, it can easily cause poisoning symptoms such as abdominal pain, vomiting, and emergency situations. Therefore, fresh jellyfish should not be eaten. It must be repeatedly treated with salt and alum to remove water and toxic mucoprotein before it can be consumed.
Fresh Pickles
Fresh vegetables contain a certain amount of non-toxic nitrates. During the salt-pickling process, these are reduced into toxic nitrites. Generally, nitrites begin to increase significantly after 4 hours of salting, peak between 14 and 20 days, and then gradually decrease. Therefore, either eat pickles within 4 hours, or it is better to eat those pickled for more than 30 days. Nitrites can cause cyanosis and other hypoxia symptoms, and can also combine with secondary amines in food to form carcinogenic nitrosamines.
Fresh Wild Vegetables
Many people love to eat fresh, natural wild vegetables when visiting scenic spots. In fact, many of these wild vegetables now grow near garbage dumps or polluted rivers, making them difficult to clean thoroughly. Eating contaminated wild vegetables can be harmful to the body.
Fresh Daylilies
Fresh daylilies contain colchicine, and one must be cautious of poisoning. Colchicine itself is non-toxic, but after entering the human body, it is oxidized into colchicine oxide, which is highly toxic. It can cause strong irritation to the gastrointestinal and respiratory systems, with clinical symptoms including a dry throat, nausea, vomiting, emergency abdominal pain, diarrhea, a burning sensation in the stomach, and in severe cases, bloody stools, hematuria, or anuria. The dried daylilies we normally eat do not contain colchicine toxins and are therefore non-toxic.
Fresh Wood Ear Mushrooms
Fresh wood ear mushrooms contain a photosensitive substance. After being consumed by humans, it is distributed to表皮 cells throughout the body via the bloodstream. When exposed to sunlight, it can cause solar dermatitis. This toxic photosensitive substance is also easily absorbed by the mucous membranes of the throat, leading to throat edema.