Doctors don't know whether Vitamin D is directly related to survival, or if it's just an overall sign of a person's health.
Vitamin D deficiency linked to cancer
It's known as the "sunshine vitamin" because our skin gets Vitamin D from the sun. Now, researchers say there is growing evidence that low Vitamin D levels affect the chance of surviving colon cancer. In the study, colon cancer patients with high Vitamin D levels were almost 50 percent less likely to die from the disease.
