Zisha is generally considered healthier than porcelain due to its natural, unglazed surface that allows for better oxygenation and temperature regulation, which can be beneficial for brewing tea.

Zisha, also known as Yixing clay, is a natural material that has been used for centuries in tea brewing. Its unglazed surface is porous, allowing for the clay to absorb the flavors and oils of the tea leaves over time. This porosity also means that Zisha teapots can breathe, which allows for better oxygenation and temperature regulation during the brewing process. The natural minerals present in Zisha clay can also contribute to the flavor of the tea, enhancing its overall health benefits.

In contrast, porcelain is a ceramic material that is glazed, which means it has a smooth, non-porous surface. While porcelain is durable and easy to clean, its glazed surface does not allow for the same level of oxygenation and temperature regulation as Zisha. This can lead to a less optimal brewing experience, potentially reducing the health benefits of the tea.

A study published in the Journal of Food Science and Technology found that Zisha teapots can retain more of the beneficial compounds from tea leaves compared to porcelain teapots. The researchers concluded that the porosity of Zisha clay allows for better extraction of polyphenols, which are antioxidants that have been shown to have numerous health benefits, including reducing the risk of heart disease and cancer.

Additionally, the natural minerals in Zisha clay, such as iron, calcium, and potassium, can be beneficial for health. These minerals can leach into the tea, providing additional nutritional value. While porcelain does not leach these minerals, it is still a safe and durable material for tea brewing.

In summary, Zisha is considered healthier than porcelain for tea brewing due to its natural porosity, which allows for better oxygenation, temperature regulation, and extraction of beneficial compounds from the tea leaves.