Research
Adherence
Exercise interventions do not significantly reduce body weight or BMI in breast cancer patients, though they may improve body composition (lean mass, bone density).
Do not expect exercise to significantly lower your body weight or BMI during breast cancer treatment. Instead, focus on the benefits of improved physical function, quality of life, and potential improvements in lean body mass and bone density, which are more meaningful health indicators.
ModerateRefutesMEDIUM confidence
There was no statistically or clinically significant change in body weight or BMI as a result of the exercise trials included in this review... positive changes in body composition may occur despite nonsignificant changes in body weight and BMI.
Why this rating
Based on 4 studies, but results were non-significant for weight/BMI.
Source
Effects of exercise on breast cancer patients and survivors: a systematic review and meta-analysis
Margaret L. McNeely · Canadian Medical Association Journal · 2006
DOI 10.1503/cmaj.051073
Meta-analysis · 14 studiesCited 1,084×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- Structured exercise interventions significantly improve quality of life, physical functioning, and peak oxygen consumption in breast cancer patients and survivors.Moderate
- Exercise interventions significantly reduce symptoms of fatigue in breast cancer patients, particularly when performed after primary cancer treatment.Moderate
Related findings · Adherence
- Regular physical activity (at least 150 minutes/week of moderate-intensity) reduces all-cause and cardiovascular mortality by 20-30% and lowers the risk of type 2 diabetes by 25-35%.Strong
- Increasing physical activity from a sedentary lifestyle to an active one in middle adulthood significantly reduces the risk of coronary events compared to remaining sedentary.Strong
- Resistance exercise is the only intervention capable of consistently restoring muscle function and strength in sarcopenia, partially overcoming age-related anabolic resistance.Strong
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