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The study included 556 women diagnosed with breast cancer in Canada when they were between the ages of 50 and 75, and a control group of 613 breast cancer-free women in the same age group. All had gone through menopause. The researchers investigated the women’s levels of occupational exposure to about 300 substances and found a link between breast cancer and several of the substances....

U.S. researchers followed 757 hospital workers who took part in a voluntary 12-week, team-based wellness program that focused on diet and exercise. Data on the participants’ weight, lifestyle behavior and heart disease risk factors were collected at the start of the study, at the end of the wellness program and a year after the program ended. At the start of the study, 33 percent of pa...