Gut Bacteria Could Be Making Kids Fat
Very interesting finding, reported by Kaleigh Rogers in Motherboard. That would explain why obesity seems to be an infectious disease. The article begins:
When it comes to childhood obesity, we tend to focus a lot on processed food and lack of physical activity. But those aren’t the only factors contributing to the epidemic, which affects close to 1 in 5 American kids.
A study published Tuesday shows how the trillions of bacteria that already live in children’s guts also impact their risk of obesity. And this understanding may pave the way to new, and better, treatments for obesity.
By studying the gut flora of 84 children and teens—from normal weight to severely obese—researchers were able to determine that the composition of microbes in the gut flora of obese children and adolescents share a lot of similarities. Eight distinct group of microbes were associated with higher body weight, and these groups were less often found in the gut flora of leaner kids, according to the study published in theJournal of Clinical Endocrinology & Metabolism.
These differences in microbiome populations—the term for the unique blend of bacteria that live in and on every human body—mean that obese kids and teens more often have bacteria that are better at fermenting carbohydrates in the stomach, which produces higher levels of short-chain fatty acids (the term for a number of acids produced in the colon when food breaks down).
“Once short-chain fatty acids are produced, either they get expelled through feces, or most of them get absorbed,” said Dr. Nicola Santoro, a Yale endocrinology research scientist and co-author of the paper.
Santoro said the researchers believe the short chain fatty acids are being absorbed in the liver and converted to fat, which would explain part of the reason why obese kids might be predisposed to put on weight.
These findings are similar to those of studies looking at the gut flora of obese adults. It’s part of a slow piecing together of a puzzle that explains what role the microbiome plays in our body fat composition, and how we might be able to influence changes.
“Studies have consistently reported an association between antibiotics and gut flora and we know the microbiome plays a role in the development of metabolism and immunity,” Annemarie Hirsch, a researcher at the Geisinger Center for Health Research who has authored studies on the impact of antibiotics on the development of the microbiome. “It’s the connection between antibiotics to microbiome to obesity that’s somewhat still a black box.” . . .