Consumption of dairy products, calcium, and vitamin D showed no increase in the risk of prostate cancer in this review and meta-analysis of 45 observational studies. Cohort studies demonstrated no link between dairy or milk consumption and increased risk of prostate cancer nor did case control studies of calcium intake. Additionally, dietary intake of vitamin D was not correlated with increased prostate cancer risk. The study did find that as calcium intake from food increased, the risk of prostate cancer decreased across all races. (15)
Butler LM complicated the understanding of the calcium and prostate cancer link when the study outcome found that moderate intakes of calcium from vegetables resulted in a moderately higher prostate cancer risk for subjects with a body mass index below 22.9. (28)