The research and promotion of longevity health care in Bama, Guangxi, and the selenium-enriched health care in Bama promoted by middle-aged children may be true to some extent.

First of all, Bama in Guangxi is known as the "hometown of longevity in the world", which means that there may be some unique factors in the local environment and eating habits, which will help to prolong life and improve health. However, the root of longevity is not a single factor, but a combination of many factors.

Secondly, selenium is a trace element in Bama and has a certain content in many foods. Some studies show that moderate intake of selenium may be beneficial to health, such as strengthening the immune system and preventing certain diseases. The soil and water in Bama area are rich in selenium, so the agricultural products in Bama may also contain high selenium content.

But it should be noted that selenium is a trace element, and excessive intake may also have a negative impact on health. Therefore, when choosing Bama selenium-enriched health products or other selenium-enriched products, it is necessary to evaluate the selenium content in the products and choose and eat them according to your physical condition and needs.

In addition, we need to be alert to some false propaganda or fraud. If the product propaganda exaggerates its efficacy excessively or there are false propaganda and other behaviors, then these products may be untrue and ineffective. Therefore, before buying and eating any health care products, it is best to remain rational, learn more about relevant information and pay attention to risk control.