Does preserved egg (century egg) cause internal heat (heatiness)?

Preserved eggs generally do not cause heatiness (excess internal heat according to traditional Chinese medicine). Preserved eggs are considered to have a cold nature in TCM, and are believed to clear heat and reduce fire toxicity. Eating moderate amounts of preserved eggs during summer can help clear internal heat, relieve summerheat, and alleviate irritability. Preserved eggs are rich in protein, fat, and cholesterol; moderate consumption can provide essential nutrients. Their unique flavor stimulates secretion of digestive juices, enhances appetite, and may help relieve anorexia. Additionally, alkali is used in the preservation process, so moderate consumption may also help alleviate excessive stomach acid. However, it is important to note that preserved eggs may contain heavy metals such as lead, and excessive consumption may lead to health problems. Moderate consumption of preserved eggs does not cause heatiness—in fact, it may have a certain heat-clearing effect. However, intake should be controlled to avoid excessive consumption.