Thursday, July 23, 2009
The 411 on SPF
Nutrition Action newsletter arrives in my mailbox bimonthly. The most interesting, newsfulled, health and diet magazine full of facts and all the "juice" i love. The feature this time was "The Skinny on Skin". It takes about how there is no evidence of antioxidants on skin aging, age is no the cause of wrinkles- sun exposure is, sugar does no cause wrinkles, sunscreen is safe.
The best feature of the article is the explanation on the SPF number. I have heard so many things about what that number really means. A sunscreen with SPF ( sun protection factor) of 30 is twice as good as an SPF 15, right... WRONG. If applied properly a sunscreen with SPF of 15 blocks about 94% of sun's UVB rays, SPF 30 blocks 97%, and one with 45 blocks about 98%. It also says how much to use.. Apply half a teaspoon each to your head, neck and each arm, and at least a teaspoon to your chest back and each leg = 6 teaspoons. A 6-8 oz bottle should only last a few days. Be careful of UVA and UVB, SPF only protects against UVB. The UVB causes sunburn, suntan, and skin cancer. UVA can cause skin aging and skin cancer. UVA sunscreend must contain 1 of the 5 following ingredients: avobenzone, ecamsule, oxybenzone, titanium dioxide, and zinc oxide. As much as I love the sun, and a suntan, i do not want wrinkles.