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Purpose : Although the benefits of physical activity, healthy eating, and weight management for breast cancer survivors are well established, little is known about how best to promote these practices among women diagnosed before age 40 years. We conducted a qualitative study to explore young breast cancer survivors' beliefs and practices regarding physical activity, nutrition, and weight management. Methods : Semi-structured interviews were conducted with 12 women (M age =36 years, SD=3.4) who were within 5 years of breast cancer diagnosis. Data were analyzed using thematic analysis. Results : Participants' accounts revealed several tensions between the factors motivating them to engage in physical activity, healthy eating, and weight management and those deterring them. Tensions were captured within three themes: (1) prolonging life with a healthy lifestyle versus enjoying living; (2) perceiving benefits versus barriers, and; (3) seeking social connection versus protecting the self from social threats. Participants also noted preferences, which if considered could help them maintain healthy lifestyle practices. Conclusions : Although young breast cancer survivors value physical activity, healthy eating, and weight management, they are constantly weighing the benefits of these practices against their perceived drawbacks. To facilitate long-term participation among young breast cancer survivors, future programing must address their conflicting beliefs and priorities.Implications for RehabilitationPhysical activity, healthy eating, and weight management can play an important role in the health and wellbeing of breast cancer survivors.Young breast cancer survivors experience a 'tug-of-war' between the factors motivating them to be active and eat healthy and those deterring them.Following treatment for breast cancer, young women would benefit from tailored lifestyle-based programing that addresses their conflicting beliefs and priorities.Tailored programing might involve strategically scheduled program times or flexible programs designed to include the participation of family and friends.

Purpose: With only 5-10% of breast cancer cases attributed to genetic inheritance, prevention efforts have focused on modifiable risk factors. Physical activity plays a role in reducing breast cancer risk; however, the interaction between physical activity and other modifiable risk factors, such as obesity, has received little attention., Methods: A systematic review and meta-analysis was conducted of studies examining the relationship between physical activity and breast cancer and how it may be modified by body mass index (BMI)., Results: A total of 29 papers were included: 18 were cohort and 11 were case-control studies. Overall, a significant reduction in the relative risk of breast cancer was found in postmenopausal women with high versus low levels of physical activity for women with a BMI <25 kg/m 2 (RR 0.85, 95% CI 0.79, 0.92) and ≥25 kg/m 2 (RR 0.87, 95% CI 0.81, 0.93) but not ≥30 kg/m 2 (RR: 0.93, 95% CI 0.76, 1.13). Physical activity was not associated with a significant reduction in risk of breast cancer in premenopausal women in any BMI group., Conclusion: The results of this meta-analysis suggest that physical activity is associated with a larger breast cancer risk reduction among women who are normal weight or overweight than among women who are obese. Since the included studies used diverse methods for assessment of physical activity and categories of BMI, results should be interpreted with caution and additional work is needed.