Separating the effects of early and later life adiposity on colorectal cancer risk: a Mendelian randomization study - BMC Medicine

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A study published in BMCMedicine finds that the positive association between early life body size and colorectal cancer risk is likely due to large body size retainment into adulthood. It may not be harmful if normal weight is maintained during adulthood.

Fwas equal to 10 suggesting that weak instrument bias may influence the analyses for men . We evaluated heterogeneity and pleiotropy to test the “exchangeability” and “exclusion restriction” assumptions . There was evidence of heterogeneity in most of the analyses as denoted by the: Tables S7 and S8).

Relatively few observational studies have examined the relationship between early life body size and risk of later life colorectal cancer. A joint Nurses’ Health Study and Health Professionals Follow-up Study found that higher body fatness in early life was associated with greater colorectal cancer risk for women but not men with similar results across cancer sub-sites [

 

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