Can you judge health from people's nails?

Human nails are not only an integral part of human aesthetics, but also a "mini-screen" to show people's health? Healthy people's nails are pink, full and shiny, with clear edges? The change of nail surface is not only a reflection of nutritional status, but also a basis for the diagnosis of several diseases? When the nail color changes or chapped and deformed, it often reflects the onset of some kind of disease, or the performance of old age and physical decline?