Canterbury University research has found excessive eating and drinking is linked to breast cancer in New Zealand women.
James Hayes says his scholarship project was designed to identify changing social and lifestyle factors that could influence the incidence of breast cancer.
Those factors include diet, smoking, lack of physical activity, high alcohol intake, obesity, older first time mothers, long-term use of hormone replacement therapy and oral contraceptive use.
He found the most important life style risk factors are obesity, high alcohol intake, and lack of physical exercise.
Mr Hayes says the research suggests it's possible that changing a few selected lifestyle choices could, at least in principle, prevent an appreciable proportion of breast cancer cases.