That is because there are polyphenolic compounds and polyphenol oxidase and other substances in lotus root. When lotus root is exposed to the air for a long time, polyphenol compounds will be generated under the catalysis of polyphenol oxidase. Brown quinones.

The quinones then automatically polymerize to form a dark brown substance. Then, the lotus root changed color. Lotus roots that have changed color can still be eaten with confidence as long as they are not rotten.

Extended information:

If it is a cut lotus root, there is also a lot of knowledge to look at the "ventilation holes". Qilu.com suggests that you can look at the ventilation hole in the middle of the lotus root. Lotus roots with larger ventilation holes are juicier. At the same time, Health Times website said that according to the number of holes, lotus roots can be divided into seven-hole lotus roots and nine-hole lotus roots.

Seven-hole lotus root has a high starch content, low water content, is glutinous but not crispy, and is suitable for soup and porridge; nine-hole lotus root has a high water content, is crisp, tender and juicy, and is most suitable for juicing, cold dressing or stir-frying.

Main functions of lotus root:

1. Clear away heat and relieve summer heat. Lotus root is cold in nature and has the effect of clearing away heat and relieving summer heat.

2. Laxative and stomachic. Eating more lotus root has the effect of promoting digestion, effectively promoting intestinal peristalsis, effectively improving loss of appetite and increasing appetite.

3. Benefit blood and promote muscle growth. Lotus root contains a lot of nutrients, including iron, calcium and other elements. It is also rich in plant protein, which can effectively improve the body's immunity. Long-term consumption is beneficial to health.

People's Daily Online-Can you still eat lotus roots if they change color? You can safely eat it if it is not rotten

People's Daily Online - Lotus root has so many benefits, but it is not recommended for these people to eat it