I asked Dr. Fuhrman for his thoughts on the study. Here’s what he had to say:
Of course processed foods, including refined carbohydrates such as white flour and sugar increase a women's risk of breast cancer. And, the findings in this study are also logical, that the use of vegetable oils, which are also low-nutrient processed foods, would increase risk of breast cancer as well.
As humans we are designed to eat and thrive on natural foods in their natural state. Eating an avocado is nothing like consuming avocado oil and eating corn oil cannot be compared to eating corn. Oil is high calorie, low nutrient food; the definition of junk food. When we eat plant fats in their natural state, such as in seeds and nuts, the scientific studies are clear, they have the opposite effect (of oil), lowering risk of all-cause mortality and extending lifespan.