There is a theory that the skin cancer we see is due to low Vit D levels. The statistics show that the more sun screen people use increases skin cancers.

What IS increasing are skin cancers and melanomas from excessive use of tanning beds. This blasting of the skin, in a dangerous way, is far more dangerous than going outside. And what is more, there are now addicts of tanning booths! People who go there regularly. Seems the blast in a short time frame stimulates endorphins and makes people "high" in a way, and they want MORE! From the stories I've read recently, it is this tanning booth craze that is doing terrible damage to young people.

People with some pigment in their skin, do not develop skin cancers as much as very fair, red headed freckled types.

The goal is to NOT burn. Burning indicates too much too fast and hence damage.

There are many many people walking around now with osteopenia... which is like adult rickets.

The British report values are slightly different than US ones.
I believe they are about 20% off, because they use mmoles instead of nannograms. I have the conversion somewhere, I'll look it up and post here later when I have time.