Home Journal Excerpts Sunlight and Cancer Prevention
Sunlight and Cancer Prevention
beachThe research studies presented here suggest that dermal activation of vitamin D from regular, moderate sun exposure has a strong protective effect in the prevention of breast can colon cancer; has a weaker protective effect in melanoma, leukemia, and lymphoma; and acts to lower overall cancer death rates.


For years we have been told to avoid sun exposure and apply sun screen at all times. This advice was fatally flawed having not taken into account the multiple functions of sunlight and vitamin D. As a result, in part people are experiencing vitamin D deficiency that will in part be responsible for increases in breast and colon cancer. And since vitamin D is involved in bone formation, low amounts of vitamin D will also contribute to a greater amount of osteoporosis and rickets, as well as less healthy gums and gum tissue. We need to all get moderate sunlight during the day and avoid the use of sunscreens that block that health giving light. In places where light is limited as in northern climates or during the winter we can return to the use of proper amounts of fish oils as a supplement and/or the use of full spectrum lights.

Beneficial effects of sun exposure on cancer mortality PDF Print E-mail
(3 votes, average 4.00 out of 5)
Friday, 01 January 1993 00:00
“For more than 50 years, there has been documentation in the medical literature suggesting that regular sun exposure is associated with substantial decreases in death rates from certain cancers and a decrease in overall cancer death rates. Recent research suggests that this is a causal relationship that acts through the body's vitamin D metabolic pathways. The studies reviewed here show that (a) sunlight activation is our most effective source of vitamin D; (b) regular sunlight/vitamin D "intake" inhibits growth of breast and colon cancer cells and is associated with substantial decreases in death rates from these cancers; (c) metabolites of vitamin D have induced leukemia and lymphoma cells to differentiate, prolonged survival of leukemic mice, and produced complete and partial clinical responses in lymphoma patients having high vitamin D metabolite receptor levels in tumor tissue; (d) sunlight has a paradoxical relationship with melanoma, in that severe sunburning initiates melanoma whereas long-term regular sun exposure inhibits melanoma; (e) frequent regular sun exposure acts to cause cancers that have a 0.3% death rate with 2,000 U.S. fatalities per year and acts to prevent cancers that have death rates from 20-65% with 138,000 U.S. fatalities per year; (f) there is support in the medical literature to suggest that the 17% increase in breast cancer incidence during the 1991-1992 year may be the result of the past decade of pervasive anti-sun advisories from respected authorities, coinciding with effective sunscreen availability; and (g) trends in the epidemiological literature suggest that approximately 30,000 U.S. cancer deaths yearly would be averted by the widespread public adoption of regular, moderate sunning. Advising the public to seek regular moderate sun exposure finds good support in the scientific literature as a means of lowering cancer mortality.”

“In 1941, Apperly reported that overall cancer death rates increased with distance from the equator, and were further decreased in areas where a large percentage of the population was engaged in the sun-intensive occupation of farming. Compared with cities located between 10° and 30° latitude, cities between 30° and 40° latitude averaged 85% higher overall cancer death rates, cities between 40° and 50° latitude averaged 118% higher overall cancer death rates, and cities between 50° and 60° latitude averaged 150% higher overall cancer death rates. After reviewing his data, the author concluded: "A closer study of the action of solar radiation on the body might well reveal the nature of cancer immunity.”