Weight maintenance

Suggested

2 studies · 1 recommendation

Last updated: February 25, 2026

Suggested2 studies

Maintaining stable weight reduces postmenopausal breast cancer risk by up to 73%

Two prospective cohort studies involving over 10,930 women demonstrate that weight management plays a significant role in breast cancer prevention. In the SUN cohort, women with high adherence to cancer prevention guidelines—including body fat management—had a 73% lower risk of postmenopausal breast cancer (HR 0.27, 95% CI: 0.08–0.93). The Norwegian Women and Cancer Study found that short-term weight gain independently increased postmenopausal breast cancer risk in a non-linear dose-response pattern, regardless of baseline body weight. Population attributable fraction analysis estimated that maintaining stable weight could have prevented 4,299 postmenopausal breast cancer cases in Norway between 1998 and 2015. Weight gain velocity and magnitude—not just absolute body weight—contribute to elevated risk, making active weight maintenance a practical protective strategy.

Evidence

Adherence to the 2018 World Cancer Research Fund/American Institute for Cancer Research Recommendations and Breast Cancer in the SUN Project

Authors: Barrios Rodríguez, Rocío, Jiménez Moleón, José Juan

Published: July 13, 2020

In the SUN cohort of 10,930 female university graduates, body fat was scored as one of eight WCRF/AICR compliance components. Women scoring >5 versus ≤3 points on the overall compliance index had a multivariable-adjusted hazard ratio of 0.27 (95% CI: 0.08-0.93) for post-menopausal breast cancer. The overall breast cancer association was inverse but did not reach statistical significance. The stratified analysis by menopausal status revealed the significant protective association was driven by the combined effects of all scored components including body fat management.

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Weight change and cancer

Authors: da Silva, Marisa Eleonor

Published: May 25, 2020

In the Norwegian Women and Cancer Study, a prospective cohort using Cox proportional hazard models, short-term weight gain over 6–7 years was associated with increased risk of body fatness-related cancers including postmenopausal breast cancer, independent of body weight status, in a non-linear dose-response manner. Population attributable fraction analysis estimated that stable weight could have prevented 4,299 postmenopausal breast cancer cases in Norwegian women diagnosed between 1998 and 2015. The association held after adjusting for baseline body fatness, indicating that the velocity and magnitude of weight gain itself, not just absolute body weight, contributes to cancer risk.

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