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Lifestyle factors and colorectal cancer risk (1): systematic review and meta‐analysis of associations with body mass index

Objective  Excess body weight, defined by body mass index (BMI), may increase the risk of colorectal cancer. As a prerequisite to the determination of lifestyle attributable risks, we undertook a systematic review and meta‐analysis of prospective observational studies to quantify colorectal cancer risk associated with increased BMI and explore for differences by gender, sub‐site and study characteristics.