Why is there no such thing as a healthy tan?

Its not the tan that's healthy or not healthy that's your own opinion. too much tan can be bad depending on how long you spent in the sun to get it. The UV rays that cause tanning are also accompanied by U.V.B rays and they can cause 2 different types of skin cancer,melanoma and nonmelanoma, strokes can be caused but its those 2 cancers you need to worry about. and before you ask sun cream blocks out the U.V.B rays only! and it depends how much you put on. sun bathing is good because the UV rays cause your skin to produce vitamin D which has a host of salubrious benefits, including the maintenance of normal blood levels of phosphorus and calcium and the promotion of healthy bones.