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11/24/2007: "light in health"

An interesting article in The Johns Hopkins Magazine November 2007 applealed to the Editor's Mensan interest in strange ideas. Johns Hopkins biologist Samer Hattar has studied the effect of travel fatigue and the lack of light coming to animals in dark hours and suggests that the animal world including humans needs light for a certain number of hours to be healthy. this he concludes is due to a clock resident in the brain. he is persuative and claims himslef that the more hours he gets in sunlight, the better he feels. My question is whether this applies in any way to the new discoveries that we are all deficient in Vitamin D and that we should get at least a half hour a day of unprotected sunlight in order to get enough of this vitamin for health. What does all this mean for our health? Do we revert to the unclothed days of our African heritage in order to survive? We welcome your comments.-Ed