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New research suggests that people's genes are [lock / key] to helping them stay slim. A study from Cambridge University in the U.K. [discovery / discovered] that thin people had DNA that contained [variants / variation] which helped them stay slim and fewer variants linked to [been / being] overweight. Researcher Sadaf Farooqi, professor of [metabolic / metabolism] and medicine, said: "We've found that there are genes [associated / associate] with thinness." She added: "Genes play at [last / least] 40 per cent of a role in people's weight. It's much more than people [realize / reality] ." This might help explain why some people are naturally [skinny / skinned] while others have big problems with keeping their weight down and seem to pile on the pounds so [easy / easily] .

The study is published in the journal PLOS Genetics. The researchers said they undertook the study to find out [why / what] so many people struggle with their weight. Over 30 per cent of American adults are [obesity / obese] , while a staggering 94.5 per cent of adults on the South Pacific island [at / of] Nauru are overweight. Professor Farooqi said she wanted to help people [whom / who] are struggling with their weight. She said: "It's easy to [rush / brush] to judgment and [criticize / critical] people for their weight, but the science shows that things are [far / for] more complex." She added: "Healthy, thin people are [generality / generally] thin because they have a lower burden of genes that increase [a / the] person's chances of being overweight and not because they are [morally / morality] superior."