Research utilizing combined data from 17 studies that included more than 12,000 people from the U.S., Europe, and Asia found that optimal levels of vitamin D for colon cancer prevention are higher than the current U.S. recommendation of 600 international units (IU) per day.
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So colorectal cancer prevalence should increase with latitude? Studies??
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There are lots of confounding variables, Lowell, especially with the widespread use of sunscreen. Here is one study that found a correlation when they controlled for comparable populations of seniors: https://healthcorrelator.blogspot.com/2013/11/latitude-and-cancer-rates-in-us-states.html
The correlation between latitude and multiple sclerosis – which is less age related- is much stronger:
https://www.ncbi.nlm.nih.gov/pubmed/21478203
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Good point lowell
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