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Study: Teen Girls' Exercise Cuts Breast Cancer Risk

1/20/2026

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Summary

Story summary

A Columbia University study finds that teenage girls who exercise at least two hours weekly may lower their breast cancer risk.
The research, published in Breast Cancer Research, shows active girls have lower water content in breast tissue, a predictor of risk.
Over half of participants reported no physical activity, signaling a concerning trend among adolescents, particularly in Hispanic and Black communities.

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Story summary

A Columbia University study finds that teenage girls who exercise at least two hours weekly may lower their breast cancer risk.
The research, published in Breast Cancer Research, shows active girls have lower water content in breast tissue, a predictor of risk.
Over half of participants reported no physical activity, signaling a concerning trend among adolescents, particularly in Hispanic and Black communities.