Green beans are very nutritious and have many health benefits, but can eating undercooked green beans cause poisoning?
Although green beans are highly nutritious, eating them undercooked poses significant safety hazards. Let's take a look at the dangers of undercooked green beans.
Green beans, especially fresh ones hit by frost, contain large amounts of saponins and phytohemagglutinins. If consumed without being thoroughly cooked, poisoning can occur. With timely treatment, most patients recover within 2 to 4 hours. To prevent poisoning, green beans should be fully heated before consumption. They can be blanched in boiling water or stir-fried in hot oil until they change color and are thoroughly cooked before being safely eaten.
Phytohemagglutinin
Phytohemagglutinin is a plant protein that is abundant in plant groups such as legumes and nightshades. The toxicity of phytohemagglutinin mainly manifests in its ability to bind to specific parts of the small intestinal surface. This binding has a significant adverse effect on the physiological function of intestinal cells. Most seriously, it damages intestinal cells, affecting their absorption of nutrients like proteins and carbohydrates, leading to nutrient deficiency and growth inhibition. In severe cases, it can be life-threatening.
Trypsin Inhibitor
Green beans also contain trypsin inhibitors. This substance is beneficial to the plant itself, as it prevents the breakdown of its own proteins and also has insecticidal properties. However, in the human body, trypsin inhibitors inhibit the activity of human proteases, leading to a decrease in the digestion and absorption of proteins. At the same time, when trypsin inhibitors bind with proteases in the intestine, they are excreted together, reducing the amount of proteases secreted by the body. This causes a reflexive hyperactivity of the pancreas, leading it to increase the secretion of trypsin, which in turn disrupts amino acid metabolism. Long-term excessive stimulation can lead to pancreatic dysfunction, causing digestive and absorption disorders, and in severe cases, symptoms such as dizziness, headaches, nausea, and diarrhea may occur.
Saponins
The main toxicity of saponins is due to their hemolytic properties and the toxicity of their metabolite, sapogenin. Sapogenin can strongly irritate the gastrointestinal mucosa, causing local congestion, swelling, and inflammation, leading to symptoms like nausea, vomiting, abdominal pain, and diarrhea. Even low concentrations of saponin water can destroy red blood cells and cause hemolysis.
With so many toxic substances, can green beans still be eaten safely?
After all this, you might find green beans a bit scary and not dare to eat them. Does that mean green beans can't be eaten at all? Of course not. Green beans are still rich in nutrients. They are rich in vitamins B and C, dietary fiber, and plant protein, and have effects of quenching thirst, strengthening the spleen, tonifying the kidneys to stop diarrhea, and replenishing qi and promoting fluid production. Li Shizhen once praised it for being able to "regulate the middle and replenish qi, strengthen the kidneys and stomach, harmonize the five organs, regulate the nutrient and defensive qi, and generate essence and marrow." The key when eating them is to cook them thoroughly. The substances mentioned above can be destroyed by sufficient high heat, so there is no need to exclude green beans from your diet in daily life.
So let's continue to look at the nutritional value of green beans.
The Benefits of Green Beans
Green beans are sweet, bland, and slightly warm in nature, and they affect the spleen and stomach meridians. They transform dampness without being harsh, strengthen the spleen without being cloying, and are commonly used for spleen deficiency with dampness retention. They have the effects of harmonizing the organs, calming the spirit, replenishing qi and strengthening the spleen, clearing summer heat and transforming dampness, and promoting urination to reduce swelling. They are indicated for spleen deficiency with dampness, poor appetite and loose stools, dampness pouring downwards, excessive leukorrhea in women, and also for summer heat damaging the middle jiao, with vomiting, diarrhea, and muscle cramps.
Furthermore, studies have shown that green beans can significantly lower serum cholesterol levels, making them particularly beneficial for patients with high blood pressure. Green beans also contain active ingredients that can inhibit the growth of cancer cells, and their rich coarse fiber can promote bowel movements, making them a food for preventing and treating intestinal tumors.
The Nutritional Value of Green Beans
Green beans are rich in vitamins B and C and plant protein. They can help clear the mind, regulate the digestive system, relieve fullness in the chest, quench thirst, strengthen the spleen, tonify the kidneys to stop diarrhea, and replenish qi and promote fluid production. Eating more green beans in the summer can effectively relieve summer heat and has a cooling effect.
The B vitamins in green beans can maintain the normal secretory function of digestive glands and the peristalsis of the gastrointestinal tract, inhibit cholinesterase activity, and help with digestion and increase appetite.
Green beans provide easily digestible high-quality protein, appropriate amounts of carbohydrates, and various vitamins and trace elements, which can supplement the body's essential nutrients.
Who Should Eat Green Beans
Generally, anyone can eat them. They are especially suitable for women with excessive leukorrhea, skin itching, and acute enteritis, as well as for cancer patients, those with acute gastroenteritis, and poor appetite. However, eating too many green beans can easily cause bloating, so they are not suitable for people who are already bloated.
Pregnant women can eat them. Green beans are very nutritious, and eating more legumes is also very good for the fetus. However, one thing to note is that green beans contain certain toxins, so pregnant women must make sure to eat them thoroughly cooked.
Postpartum women and breastfeeding mothers can also eat them. Green beans are very nutritious, and eating more legumes is also very good for the baby. However, green beans can cause bloating, so postpartum women should eat them in moderation.
Babies can also eat them. Green beans are a nutritious vegetable and are fine for infants and young children to eat. But it must be remembered that they must be cooked thoroughly before consumption, as undercooked green beans can easily cause diarrhea in babies.