Genetic Testing and Childhood Obesity
A recent global study published in Nature Medicine suggests that genetic testing can identify a child’s risk of becoming obese in adulthood. Researchers discovered that a polygenic risk score (PGS) could effectively predict severe obesity risks from an early age.
The PGS functions like a computer, aggregating the effects of various genetic mutations that individuals may carry. Notably, it can be conducted as early as age 5, providing opportunities for proactive measures against obesity, according to the Novo Nordisk Foundation’s Center for Basic Metabolic Research at the University of Copenhagen.
This study implies that early identification could lead to tailored prevention strategies, perhaps lifestyle modifications for children before weight issues arise. “Overall, these data indicate that PGS may improve obesity predictions, especially when implemented early in life,” the researchers stated.
Roelof Smitt, an assistant professor at the NNF Center, emphasized the score’s effectiveness, describing it as “very powerful” in its ability to foresee obesity in adults. He mentioned that intervening at this early stage could yield significant impacts.
This extensive research involved over 600 scientists from 500 institutions worldwide, including the consumer genetics firm 23andme, Inc., showcasing a robust collaboration among genetic researchers.
After analyzing genetic data from more than 5 million individuals, scientists developed the largest and most diverse genetic dataset reported to date. The findings revealed that the PGS is twice as effective as previous best methods at predicting obesity risk, accounting for roughly 17.6% of the risk associated with developing a high body mass index (BMI) in adulthood.
Ruth Loos, a professor at the University of Copenhagen, stated that this new polygenic score represents a significant leap in the genetic prediction of obesity risk, edging closer to clinically applicable genetic testing.
Interestingly, the research also indicated that individuals at high genetic risk can respond positively to lifestyle weight loss interventions. However, it’s worth noting that these individuals tend to regain weight more rapidly once such interventions cease.
The researchers acknowledged that while the PGS shows promise, its predictive capabilities are currently more accurate for people of European descent compared to those with African ancestry.
