The organisation said that healthy eating, regular exercising and not smoking could reduce the number of cases by 95,000 people a year, more than the capacity of Wembley stadium.
"When you think about what Wembley Stadium looks like when it's full of people, it is a sobering thought that every year in the UK we estimate that even more people than this are diagnosed with a cancer that might have been prevented," said Professor Martin Wiseman, of the WCRF.
According to the WCRF, the number of cases of womb cancer twice as prevalent in the obese has risen by more than a fifth over the last ten years, while kidney cancer has increased by nearly one sixth.
It advised people to stay slim, exercise for at least half an hour a day and eat fruit, vegetables, wholegrains and pulses.
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