Almost 19,000 people a year in the UK are diagnosed with cancer that could have been prevented if they were a healthy weight, an expert says.
Professor Martin Wiseman said if everyone had a body mass index (BMI) under 25 it would make a big dent in the incidence of cancer.
Cancers of the breast, bowel, kidney, pancreas, oesophagus and womb lining are among those linked to obesity.
Professor Wiseman is an adviser for the World Cancer Research Fund (WCRF).
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