Can boiling red bean water turn green and be drinkable

Boiling red bean water turns green and is usually drinkable, which may be related to the water quality or oxidation of natural components in red beans. If the water contains alkaline substances or anthocyanins in red bean skins change color when exposed to alkaline environments, it is a normal phenomenon; But if accompanied by abnormal conditions such as odor and mold, it is not recommended to drink. The green color of boiled red bean water is often caused by changes in the acidity and alkalinity of the water. Red bean skin contains anthocyanins, which turn red in weakly acidic water and blue-green in alkaline water. This is a normal reaction of natural pigments. When using tap water or water with high mineral content, components such as calcium carbonate in the water may increase the pH value and cause color changes. In this case, red bean water does not produce harmful substances, is safe to drink, and has unchanged nutritional value. It can supplement dietary fiber and potassium elements.

In rare cases, when red beans turn green, one should be alert to the risk of spoilage. If stored for too long or the container is not clean, it may breed microorganisms such as Pseudomonas aeruginosa, causing the liquid to turn green and produce a sticky feeling. When red beans become moldy, yellow green mold spots may also appear, accompanied by a sour odor. This type of spoiled red bean water contains toxins, which may cause gastrointestinal discomfort and symptoms such as abdominal pain and diarrhea if ingested. It should be discarded immediately.

It is recommended to use filtered or purified water for daily boiling of red bean water. After boiling, drink it as soon as possible to avoid prolonged storage. It can be paired with a small amount of tangerine peel or ginger to adjust the flavor. For those with weak digestive function, it is necessary to control the amount consumed. If there are abnormal reactions such as dizziness and nausea after drinking, stop immediately and seek medical attention for investigation. Red beans are rich in high-quality protein and B vitamins. Reasonable consumption can help promote metabolism, but it is important to ensure that the ingredients are fresh and processed in a hygienic manner.