Research
Hormonal
Higher body mass index (BMI) at age 18 is associated with a lower risk of both premenopausal and postmenopausal breast cancer.
Maintaining a healthy weight in your late teens and early adulthood may offer long-term protection against breast cancer. While extreme leanness is not necessarily better, avoiding being underweight might be beneficial. Focus on overall health rather than extreme thinness.
GoodSupportsHIGH confidence
Higher BMI at the age of 18 years was associated with lower breast cancer incidence both before and after menopause.
Why this rating
Large prospective cohort with long follow-up and adjustment for confounders.
Source
Dual Effects of Weight and Weight Gain on Breast Cancer Risk
Zhiping Huang et al. · JAMA · 1997
DOI 10.1001/jama.1997.03550170037029
cohort · n=95256Cited 830×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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