Is it okay to eat shepherd's purse without blanching it first?

Whether consuming raw shepherd's purse (Capsella bursa-pastoris) causes problems mainly depends on the quantity consumed and how the shepherd's purse is processed. If it is thoroughly washed before consumption and eaten in moderation, there is generally no problem. However, if the shepherd's purse may be contaminated or if excessive amounts of unblanched shepherd's purse are consumed, adverse effects may occur. Detailed analysis is as follows:

If the shepherd's purse has been thoroughly washed before consumption, removing surface dirt and pesticide residues, and is cooked thoroughly using a high-temperature cooking method, then even without blanching, it is generally safe to eat. High-temperature cooking can effectively reduce oxalic acid content, and the gastrointestinal tract can metabolize some harmful substances. At normal consumption levels, food poisoning generally does not occur.

If the shepherd's purse grows in farmland or areas where pesticides are used, it may contain pesticide residues. Consuming unblanched shepherd's purse directly may allow pesticides to enter the human body, and after accumulating to a certain level, may cause poisoning symptoms such as dizziness, nausea, and vomiting. Additionally, shepherd's purse contains oxalic acid. If large amounts of unblanched shepherd's purse are consumed, oxalic acid can combine with calcium in the body to form calcium oxalate, which may be detrimental to health with long-term consumption.

It is recommended to blanch shepherd's purse before cooking, as this can remove some impurities and harmful substances, and soften the shepherd's purse, making it easier to digest and absorb.