During storage, if potatoes are exposed to light for a long time, the surface layer will produce chlorophyll, which will germinate, and then the chlorophyll part will produce a lot of solanine. Green potatoes obviously have more chlorophyll and more solanine.

Solanine is corrosive and irritating to human gastrointestinal mucosa. If poisoned, there will be symptoms such as nausea, vomiting, abdominal pain and diarrhea. In addition, Solanum nigrum has a strong inhibitory effect on cholinesterase activity in the central nervous system. If it is seriously poisoned, convulsions, shock, coma and dyspnea will occur.

Extended data taboo

1, should not be excessive

When eating potatoes, we should also pay attention to not eating them in large quantities. Although potatoes are nutritious and taste good, they contain a lot of starch. If they are eaten in excess, it is likely to affect the digestion and absorption of the stomach and affect health.

2, avoid eating even the skin

Potato skin contains a toxic substance called solanine, which can cause acute poisoning if ingested in large quantities.

This toxic substance is mostly concentrated in its skin, with red skin or purple skin more than yellow skin, and the number of people whose skin turns blue with the depth of color increases. Therefore, it is necessary to peel the skin when eating, especially to peel off the green skin, because even if potatoes are peeled after being cooked with skin, about 10% of solanine in the skin may be transferred to the pulp.

References:

People's Network "Potatoes can't be eaten when they sprout, so what about turning green?" It is better to throw it away.

People's Daily Online "How to Know the Precautions for Eating Potatoes when Eating Too Many Potatoes"