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A recent study found that increasing body weight accounted for about 4% of all cancers worldwide and a large proportion of malignancies diagnosed in developing countries.
In 2012, weight gain was responsible for 544,300 cancer cases diagnosed worldwide each year, researchers said in The Journal Journal for Clinicians.
While overweight and obese people accounted for only 1% of cancers in low-income countries, they accounted for between 7% and 8% of cancers diagnosed in some Western high-income countries, as well as in the Middle East and in North Africa.
"Many people are unaware of the link between weight gain and cancer," said Song Huawana, who headed the study group of the American Cancer Society in Atlanta.
"Trying to maintain and maintain a healthy weight is important and can reduce the risk of cancer," she said in an email.
Western lifestyle
Researchers have indicated that the proportion of overweight and obese people has increased worldwide since the 1970s.
In 2016, 40% of adults and 18% of children of school age were overweight or obese on 2 billion adults and 340 million children worldwide.
The researchers said that while the proportion of people who gained weight grew rapidly in most countries, this increase was more pronounced in some low-income and middle-income countries with a Western lifestyle with little physical activity and many unhealthy foods.
"The simultaneous increase in weight gain in almost all countries is largely attributable to global diet shifts focused on energy-rich foods and their nutritional value, as well as the reduction in the potential for increased weight gain." Physical activity, "said Song.
Overweight and obesity are closely related to an increased risk of 13 types of tumors: bad, colon, rectum, uterus, esophagus, gallbladder, kidneys, liver, ovaries, pancreas, stomach, thyroid, brain, spinal cord and blood cells.
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