They advise to eat smaller portions of red and processed meat such as bacon and to eat no more than three portions of it a week.
"It's unlikely that there are "magic bullet" specific foods or nutrients that in themselves cause or protect against cancer", Dr. Kate Allen, WCRF executive director of science and public affairs, said in a blog post.
Being overweight is likely to overweight smoking as the biggest risk factor for cancer within decades, according to the report.
The World Cancer Research Fund urges people to limit alcohol consumption but states: 'For cancer prevention, it's best not to drink alcohol'.
The WCRF's cancer prevention recommendations, which come from the latest report and from conclusions drawn by an independent panel of experts, recommends a number of lifestyle choices that people can take to reduce their risk of cancer. The team then analysed this to determine BMI, weight change over a 6-year period, and the subsequent risk of obesity-related cancers defined as cancer of the breast (postmenopausal), colon-rectum, endometrium, ovary, pancreas, kidney, gallbladder, gastric cardia, liver, oesophagus (adenocarcinoma), meningioma, thyroid, and multiple myeloma.
The new guidelines from the World Cancer Research Fund (WCRF) are part of a ten-point plan to help you reduce your risk of cancer.
Preventing obesity forms a significant part of the advice, with being overweight likely to overtake smoking as the "number one risk factor for cancer" within decades, the organisation warned.
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The study, however, is even stricter on the consumption of processed meat.
Fast food eaters are also at risk for cancer. Magdalena Taube and colleagues at the University of Gothenburg in Sweden have shown that obese people who undergo stomach-shrinking bariatric surgery and lose a quarter of their weight have a dramatically decreased risk of the cancer. "While following each individual recommendation is expected to offer cancer protection benefit, the most benefit is to be gained by treating them as an integrated pattern of behaviours relating to diet and physical activity, and other factors, that can be considered as a single overarching "package" or way of life", the report reads. WCRF recommends that people cut down on fast and processed convenience foods.
The WCRF estimates that around one in six deaths each year, worldwide, are now caused by cancer. In Europe, there are around 3.7 million new cases and 1.9 million deaths from the disease every year.
The "Diet, Nutrition, Physical Activity and Cancer: a Global Perspective" report presented at the European Congress on Obesity in Vienna included an updated version of the organization's cancer prevention recommendations, which it dubbed its "blueprint to beat cancer".
Having a diet rich in whole grains, vegetables, fruit and beans can help prevent cancer while mothers are encouraged to breastfeed where possible to help reduce their risk of breast cancer.
Obesity and weight gain are well known to independently increase the risk of several cancers, often referred to as "obesity-related" cancers. She also called on the government to act to curb junk food marketing.