What Happens if You Eat Raw Soybeans?

Written by barbara bean-mellinger
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What Happens if You Eat Raw Soybeans?
Soybeans in their shell -- edamame -- are a treat to eat, but only if they are cooked first. (Thinkstock Images/Comstock/Getty Images)

Soybeans are a good source of vitamin C, calcium, iron, protein and fibre, while being low in cholesterol. However, to be safe, soybeans must be cooked before eating them. Raw soybeans can make a person sick and are even toxic enough to potentially cause death. Soybean pods are tough and bitter tasting, making them a poor choice for eating raw. But for anyone who would want to try it, experts advise that they reconsider, and at least steam them first.

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Severe Gastric Distress

Raw soybeans cause different symptoms in people. Most of the symptoms are related to the stomach and intestines. Diarrhoea is very common with raw soybeans. Some people experience stomach aches or pain instead, which can be accompanied by nausea or vomiting.

Dizziness

Some people experience dizziness when they eat raw soybeans. It is not clear whether the dizziness is a lone symptom, or if it is accompanied by nausea, vomiting or diarrhoea.

Enzyme Inhibitors

Soybeans naturally contain protease inhibitors that keep the digestive enzymes from working. The digestive enzymes break down food so it can be digested. If these enzymes are kept from working, the food -- in this case, soybeans -- cannot be digested. That is why raw soybeans cause such symptoms of gastric distress. Cooking destroys the protease inhibitors in soybeans so they can be digested.

Phytic Acid Blocks Nutrients

Soybeans are high in phytic acid, which keeps nutrients from being absorbed by the body. Cooking destroys the phytic acid so the nutrients that soybeans can provide are easily absorbed.

Other Toxic Raw Vegetables

Soybeans are not the only vegetables that should not be eaten raw. Most beans cause some toxicity if eaten raw. Whether they cause mild stomach aches or more serious toxicity depends upon the individuals and how much of the raw bean they ate. Lima beans release a cyanide compound when their shells are opened, but cooking destroys the compound. Red kidney beans are among the most toxic of beans. They are very high in lectin, which can cause toxicity if only a few raw beans are eaten, or if they are undercooked, which can occur in some crock pots when dried beans are used.

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