After a seven year experiment involving more than 3000 women, a government study found that a diet low in fat and high in fruits and vegetables (higher than the recommended 5 servings a day) did NOT prevent the return of breast cancer.
Earlier research on whether a healthy diet prevents breast cancer has shown mixed results. The new study was designed to be more rigorous. In this experiment, all the women had been successfully treated for early-stage breast cancer. Their average age was 53 when the study began.
Low-fat diet didn't halt breast cancer.