Diet: Vitamin D Levels Decreasing?

Women with health issues such as arthritis, hypothyroidism, cancer, high blood pressure, and osteoporosis are much more likely to have inadequate levels of vitamin D during seasons with decreased daylight. 28% of women had deficient levels and 33% had insufficient levels of vitamin D. Women taking supplements were able to significantly elevate their vitamin D levels.
American Society for Clinical Pathology, November 2012