Can tofu and preserved egg be eaten together?
Under normal circumstances, tofu and preserved egg (pidan) can be consumed together, with attention to moderate intake. The detailed analysis is as follows:

Tofu is rich in high-quality plant protein, calcium, soy isoflavones, and other nutrients, while preserved eggs contain protein, fat, and various trace elements. Combining the two can complement each other nutritionally, providing a more comprehensive supply of nutrients for the body. Tofu has a tender and smooth texture, while preserved eggs offer a unique flavor. When paired together in cooking, they create a rich and layered taste experience. For example, the classic cold dish of tofu with preserved egg is refreshing and appetizing, making it a popular delicacy on dining tables. Additionally, the soy protein in tofu interacts with amino acids in preserved eggs, enhancing the overall umami flavor and improving the dish's palatability.
However, during the production process of preserved eggs, lead-containing substances are sometimes used. Although most modern methods are lead-free, trace amounts of lead may still remain, so excessive consumption is not recommended. Moreover, both tofu and preserved eggs are considered cooling foods in nature. Individuals with spleen and stomach deficiency-cold should control their intake to avoid potential gastrointestinal discomfort.