Women who suffer from breast cancer should beware of one deadly type of food. Research at Kaiser Permanente Division of Research, in Oakland, Calif., shows that these foods seriously increase the risk of death for breast cancer patients.
The problem foods are high-fat dairy products.
Previous research shows that lifetime exposure to estrogen is a causal pathway to breast cancer. Estrogen levels are thought to be high in dairy products because most milk in the supermarket comes from pregnant cows. Estrogenic hormones reside primarily in fat: Levels are higher in high-fat dairy foods than in low-fat dairy products.
“Specifically, women consuming one or more servings per day of high-fat dairy had a 64 percent higher risk of dying from any cause and a 49 percent increased risk of dying from their breast cancer during the follow-up period (of our study),” says researcher Candyce H. Kroenke.
The categories of high-fat dairy products the researchers examined included cream, whole milk, condensed or evaporated milk, pudding, ice cream, custard, flan, and also cheeses and yogurts that were not low-fat or non-fat.
At the start of the study, 1,893 women in Utah and California completed a self-administered food-frequency questionnaire, and 1,513 of these women completed a follow-up questionnaire six years later. They were followed for 12 years on average.