Too much dietary calcium can increase the risk of developing prostate cancer, according to an 11-year study recently completed by researchers from Harvard University Medical School. Dietary and lifestyle data from 20,855 male physicians was used in the study, and 1,012 men developed prostate cancer. Researchers focused on dairy intake as a possible explanation for the figures and created a daily dairy score for each participant, marked in relation to calcium intake through five common dairy foods; whole milk, skim milk, ice cream, cold breakfast cereal and cheese.