A study, published in the latest February issue of the Journal of Clinical Oncology suggested regular exercise and tea consumption might prevent depression in breast cancer patients. 
The study was conducted between 2002 and 2006 in 1,399 women who had been diagnosed with stage 0 to III breast cancer in Shanghai, China. Investigators collected lifestyle, clinical and sociodemographic information at 6 months and measured depression symptoms at 18 months after the diagnosis.
The study found that women who exercised regularly were 44% less likely to develop clinical depression than non-exercisers. Also, regular tea consumption (>100 g dried tea leaves/mo) lowered risk of depression by 61%.
Since depression is a prognostic factor for breast cancer survivor, regular exercise and tea consumption might extend survival in patients with this disease. However, a proper, well-designed clinical trial is required to confirm this hypothesis.
Chen et. al. J Clin Oncol 28:991-998. 2010
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