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Research in Denmark suggests that heavier and older children are more likely to develop kidney cancer in adulthood.
The experts found that the most important risks for children who had a normal weight at the age of seven but who gained weight at the age of 13 years.
Researchers already know that about one-third of kidney cancer cases can be prevented, with obesity linked to 24% of cases.
For the study, led by experts from the Danish Center for Clinical Research and Prevention at Bispebjerg and Frederiksberg Hospital, 301,422 people, half of whom were men, were examined.
All were born from 1930 to 1985 and their weight and height were recorded during annual medical examinations performed between 7 and 13 years.
Cases of kidney cancer were then identified from the Danish Cancer Registry and the risk of the disease was calculated.
During a mean follow-up of 32 years, a kidney cancer was diagnosed in 1 010 people.
Experts found that in two 13-year-old boys of similar size, where one weighed 5.9 kg more, the heaviest boy had a 14% higher risk of kidney cancer compared to 39, lighter child.
It was the same for a pair of 13-year-old girls where the heaviest girl weighed 6.8 kg more.
In height, a 13-year-old boy, 8 cm taller than his peers, had a 12% increased risk of kidney cancer later in life.
The same goes for a pair of girls where the largest measures 6.9 cm.
Compared with normal-weight children aged 7 and 13, overweight children at the ages did not have an increased risk of kidney cancer.
But normal-weight children 7 years old and overweight at age 13 were 67% more likely to develop the disease.
The study was presented at the European Congress on Obesity in Glasgow and was peer reviewed by conference officials.
Dr. Britt Wang Jensen, lead author, said, "We know that overweight in adulthood is badociated with an increased risk of renal cell carcinoma (RCC).
"We also know that it takes several years before cancers develop, so we had a theory that being overweight in children would increase the risk of RCC later in life.
"We have found in other studies that the size of childhood is positively badociated with several forms of cancer.
"As a result, we expected large children to be at a higher risk of CRC than children of average height."
Australian Associated Press
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