Fasting-mimicking diet during treatment for Breast Cancer

Cancer cells are well equipped to accumulate nutrients, which are necessary for them to grow and divide rapidly, called proliferation. Short term fasting, which reduces nutrient intake for a period of time causes normal cells to switch from their proliferating or “growing” phase toward a maintenance phase. However, cancer cells are unable to switch off their proliferation phase - and therefore, they are deprived of nutrients, which can make them more sensitive to cancer therapies and increase cell death, all while sparing healthy cells. Fasting mimicking diets have been found to decrease insulin-like growth factor-1 (IGF-1), which is a known growth factor for cancer cells.

Research in Nature Communications studied the effect of fasting-mimicking diet surrounding neoadjuvant chemotherapy in HER-2 negative early stage breast cancer patients [1]. The study found that reducing caloric intake three days before and on the day of chemotherapy increased the sensitivity of tumor cells to chemotherapy with no additional side effects compared to those receiving chemotherapy and eating their regular diet. The study also found that fasting-mimicking diet decreased damage to healthy cells compared to those that did not change their diet.

[1] https://www.nature.com/articles/s41467-020-16138-3

Written by Dr. Dana Kolenich ND