Vitamin D levels tied to colon cancer risk‎

In 18 studies that included more than 10,000 people, colon cancer risk was as much as 33 percent lower in subjects with the highest blood levels of vitamin D compared to those with the lowest levels, researchers report in the Journal of Clinical Oncology. Those with the highest intake of vitamin D through supplements and food had 12 percent lower risk than those with the lowest intakes.

Vitamin D has previously been linked to protection from various cancers, heart disease, diabetes and asthma, among other conditions. How the vitamin might exert a beneficial effect is still poorly understood, however. Some evidence suggests that to achieve a benefit people may need more than current recommended daily requirements.

Limitations of the analysis, the researchers note, included the lack of uniform criteria for comparison groups across the various studies; also, not all of the studies had information on vitamin D intake or its blood levels for individuals, only ranges for groups. The “lowest” and “highest” categories in different studies also varied significantly. Read more…

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