People carrying a gene associated with fat mass and obesity -- FTO gene -- are at risk of being heavier and increasing their obesity levels. Carriers of this FTO gene are known to be on average 3 kilos heavier and 70 per cent more likely to be obese.
However, carrying the risk version of the FTO gene has no effect on weight loss, as people with FTO gene respond just as well to weight loss interventions as everyone else, the study said.
"You can no longer blame your genes. Our study shows that improving your diet and being more physically active will help you lose weight, regardless of your genetic makeup," said lead author Professor John Mathers at Newcastle University in Britain.
Moreover, the response to weight loss interventions for people carrying the risk variant of the FTO gene was similar for men and women, younger and older and of different ethnicities, the researchers stated.
"This is important news for people trying to lose weight as it means that diet, physical activity or drug-based weight loss plans will work just as well in those who carry the risk version of FTO," Mathers added.
For the study, published in the journal The BMJ, the team used individual data from 9,563 adults, who were enrolled in random controlled weight loss trials around the world to find out whether carrying the risk version of the FTO gene affects the amount of weight loss.
The causes of the obesity epidemic are multiple and complex, but current evidence suggests they have little to do with gene profiles, Alison Tedstone, Chief nutritionist at Public Health England, said in a linked editorial.
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