There is strong evidence that a high-fat diet increases the risk of breast cancer in postmenopausal women. This is shown by the results of an extensive American study.

In this study, 188,700 women were interviewed about their diet and a direct link was found between breast cancer and fat consumption.
The study was conducted by the National Cancer Institute in the United States.

The participants included were between 50 and 71 years old. The researchers asked women about portion sizes and the frequency of consumption of 124 different foods. The follow-up period was on average 4 years.

The amount of fat consumed was calculated as a percentage of the total energy intake, with the possibilities ranging from 20% fat for people consuming the least amount of fat to 40%.

Of all the women included in the study, 3,501 developed invasive breast cancer at follow-up.

Women who consumed the most fat had 11% more cases of cancer than those who consumed the least.

The increase in risk was similar, regardless of the type of fat intake - saturated, monounsaturated or polyunsaturated.

Risk factors such as family history of breast cancer, smoking, body mass index and alcohol were taken into account.

According to study leader Dr. Annie Tielbot, this large-scale cohort study of postmenopausal women found that there was a direct link between fat intake and the risk of invasive breast cancer.