Ten different types of cancer linked to high body mass index.

cancerObesity has been linked to a wide range of conditions. Now a new study has linked high () to an increased risk of developing the most common cancer. The study, published in the Lancet journal, involved more than 5 million adults.

The researchers identified 5.24 million individuals aged 16 and older who were cancer free and followed them for approximately 7.5 years in Britain.

The risk of developing 22 of the most common cancers, representing 90% of the cancers diagnosed was measured according to after adjusting for individual factors such as age, sex, smoking status, and socioeconomic status. In this study a total of 166 955 people developed one of the 22 cancers studied over the follow-up period. was clearly associated with 17 out of the 22 specific examined.

The results reveal that each 5 kg/m² increase in was clearly linked with higher risk of cancers of the uterus (62% increase), gallbladder (31%), (25%), cervix (10%), thyroid (9%), and (9%). Higher also increased the overall risk of liver (19% increase), colon (10%), ovarian (9%), and breast cancers (5%), but the effects on these cancers varied by underlying and by individual-level factors such as sex and menopausal status. Even within normal ranges, higher was associated with increased risk of some cancers.

Dr Bhaskaran, the lead , commented on the study: “There was a lot of variation in the effects of on different cancers. For example, risk of cancer of the uterus increased substantially at higher ; for other cancers, we saw more modest increases in risk, or no effect at all. For some cancers like occurring in younger women before the menopause, there even seemed to be a lower risk at higher . This variation tells us that must affect cancer risk through a number of different processes, depending on the cancer type.”

The researchers recommend societal policy strategies focusing on reducing caloric intake or increasing physical activity, and include taxes on calorically dense, nutritionally sparse foods (eg, sugar-sweetened beverages); subsidies for healthier foods, especially in economically disadvantaged groups; agricultural policy changes; and urban planning aimed at encouraging walking and other modes of physical activity.

Source

Krishnan Bhaskaran, Ian Douglas, Harriet Forbes, Isabel dos-Santos-Silva, David A Leon, Liam Smeeth. Body-mass index and risk of 22 specific cancers: a population-based of 5·24 million UK adults. The Lancet, 2014; DOI: 10.1016/S0140-6736(14)60892-8

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