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High-Fat Diets May Accelerate Aggressive Breast Cancer Growth, Study Finds

Princeton, NJ – March 3, 2026 – A new study has revealed that diets high in fat may accelerate the growth of some aggressive forms of breast cancer, potentially complicating treatment. The research highlights the potential role of diet in cancer development, particularly in cases of triple-negative breast cancer.

Researchers from Princeton University found that high-fat diets, which can lead to increased levels of harmful cholesterol, can speed up tumor growth. Professor Celeste Nelson, a biochemist and author of the study, stated the team initially sought dietary patterns that might gradual tumor growth, but discovered a high-fat diet was the sole factor that accelerated tumor development.

Published in AIP Publishing, the study indicates that fat-rich environments alter metabolism within cancer cells, increasing production of a protein called MMP1. This protein is linked to poorer patient outcomes, as it helps cancer cells move and invade surrounding tissues, promoting tumor spread rather than simply increasing cell division.

The study focused on triple-negative breast cancer, a particularly aggressive form that grows and spreads quickly and has limited treatment options due to its lack of response to hormone therapy. Experiments showed that tumors exposed to fat-rich conditions grew larger and invaded surrounding tissues more rapidly.

These findings come as international analyses predict a rise in global breast cancer cases from 2.3 million annually to 3.5 million by 2050, with a projected 44% increase in deaths to approximately 1.4 million per year. Researchers note that over a quarter of years of healthy life lost due to the disease are linked to modifiable risk factors, including obesity, high blood sugar, smoking, physical inactivity, excessive alcohol consumption, and increased red meat intake. This underscores the importance of healthy dietary patterns in both prevention and treatment strategies.