‘Skinny genes’ makes weight loss effortless for some

COLCHESTER, United Kingdom — Have you ever wondered why some people seem to lose weight effortlessly while others struggle to shed even a few pounds? A study by researchers in the United Kingdom suggests that the answer may lie in our genes. A team has discovered that certain genetic variations can significantly influence how people respond to exercise when it comes to weight loss.

The study, published in the Research Quarterly for Exercise and Sport, investigated how different genetic profiles affected weight loss in response to an eight-week running program. The results were eye-opening: participants with specific genetic markers lost significantly more weight than others, despite following the same exercise regimen.

Led by Henry C. Chung and a team of researchers from the University of Essex and Anglia Ruskin University, the study involved 38 previously inactive adults from the U.K. Midlands and East Anglia region. Participants, who were between the ages of 20 and 40, were randomly split into two groups: an exercise group that followed a structured running program and a control group that maintained their usual lifestyle.

The exercise program wasn’t overly demanding. Participants ran outdoors three times a week, starting with 20-minute sessions and gradually increasing to 30 minutes over the eight-week period. They were asked to maintain their usual diet throughout the study.

At the end of the eight weeks, researchers observed a striking difference in weight loss among the participants. Those with more of the identified “skinny genes” lost significantly more weight than those without them. On average, individuals with the most genetic markers lost up to 5 kg (11 pounds), while those without these genes lost an average of 2 kg (4.4 pounds).

To unravel this mystery, researchers analyzed each participant’s DNA, screening for 1,000 genetic variations known as single nucleotide polymorphisms (SNPs). Think of SNPs as tiny spelling variations in our genetic code that can influence various aspects of our health and physiology.

In all, the study identified 17 specific SNPs that were strongly associated with weight loss in response to exercise. Participants who had more of these “favorable” genetic variations lost significantly more weight than those who had fewer. Remarkably, the research showed that 62% of the observed weight loss was linked to genetic factors, while 37% was attributed to exercise and lifestyle changes. This means that genetics played a major role in determining how much weight each person lost, even when following the same exercise program.

Don’t despair if you don’t have these “skinny genes.” The study also found that exercise was beneficial for everyone, regardless of their genetic profile. All participants in the exercise group improved their cardiovascular fitness, running an average of 12.43% further in a 12-minute test by the end of the study.

“This study highlighted some important genes associated with taking inches off the jeans, but it’s important to remember that the genes will do nothing without exercise and lifestyle changes as they are all interlinked,” Chung says in a statement.

The genes identified in the study fall into two main categories. The first group includes genes involved in controlling diet, fat storage, and energy metabolism. For example, one gene called PPARGC1A plays a crucial role in regulating how our bodies burn fat and use energy. Another gene, CPT1B, helps transport fatty acids into our cells’ powerhouses, the mitochondria, where they’re burned for fuel.

The second group of genes is more surprising. These are associated with intelligence and psychological conditions, particularly depression. This connection highlights the complex relationship between mental health, cognitive function, and weight management.

So, what does this mean for the average person trying to lose weight? While we can’t change our genes, understanding our genetic predispositions could help tailor more effective weight loss strategies. In the future, genetic testing might allow for personalized exercise and diet plans that work best for each individual’s unique genetic makeup.

However, it’s crucial to remember that genes are just one piece of the puzzle. The study showed that everyone benefited from exercise, regardless of their genetic profile. So while some people might have a genetic advantage when it comes to losing weight through exercise, staying active is still important for overall health and fitness.

Despite the strong genetic component, Dr. Chung emphasizes that lifestyle factors and exercise remain crucial for weight loss and overall health. “Without intervention,” he says, “they won’t show their true potential and then it doesn’t matter what genes you have!”

“Away from weight loss exercise has so many benefits – ranging from mental health to cardiovascular fitness – so I’d advise everyone to keep on training even if they aren’t seeing the difference on the scales,” Dr. Chung stresses.

This study builds on Dr. Chung’s previous research, which showed that running performance is also linked to genetics. The findings have potential implications for personalized health interventions. Dr. Chung expresses hope that this research could lead to more tailored approaches to improving health outcomes.

“If we can better understand someone’s specific genetic profile, hopefully, this will translate to better and more successful interventions for improving health outcomes,” the researcher says.

This research opens up exciting possibilities for the future of personalized fitness and weight management. However, the fundamental principles of a healthy lifestyle – regular exercise, balanced nutrition, and good mental health – remain essential for everyone, regardless of their genetic makeup.