Let me show you the relevant news:
Yesterday, the reporter contacted Liu Su and asked if the red phoenix dish had the function of iron supplementation. Liu Su said that this may be a misinformation. "According to traditional medicine, red food can enrich blood, but according to modern medicine, blood needs iron. Purple cabbage is not high in iron content, and it is said that it can supplement iron, probably because the back of purple cabbage leaves is red, so there have been rumors that purple cabbage can supplement iron. Stir-fried pork liver with red cabbage can really supplement iron, but that's because pork liver contains iron and has nothing to do with bloody vegetables. "
Liu Su introduced that Gynura bicolor belongs to Compositae, Senecio and Gynura bicolor in taxonomy. In the last century, chemists found that Pyrrolizidine Alkaloid (PA) was widely found in Senecio plants. A large number of animal toxicity experiments proved that PA had strong hepatotoxicity, which could lead to liver cirrhosis, carcinogenesis, teratogenicity and primary pulmonary hypertension. Later, these alkaloids were also isolated from purple sweet potato. Toxicological analysis of purple sweet potato and several other Inula wild vegetables showed that the above-ground part of purple sweet potato had the strongest hepatotoxicity. Therefore, Liu Su suggested that people had better not eat red phoenix vegetables.
In addition, Liu Su warned that pig liver could not solve the toxicity of PA. "If you have to eat, it is recommended to fry with fire, because in this high temperature and water-deficient environment, some PA may be destroyed, and the most unsafe thing is to eat cold."