 obesity has been linked to an increased risk of developing breast cancer and poorer outcomes in breast cancer patients. However, the effects of obesity on breast cancer biology have not been extensively studied in humans. In this study, researchers examined the biological differences between obese and non-obese breast cancer patients. They found that obese patients had higher rates of certain gene mutations and experienced faster aging at the molecular level. Additionally, they observed that obese patients had a greater inflammatory response in their tumours than non-obese patients. The findings suggest that obesity could contribute to the development of breast cancer and its progression. This article was authored by Harlin Nguyen, Totchona Gukins, Marion Matens, and others.