Representational Image(Unsplash)
Representational Image(Unsplash)

Here's how eating habits could cause child obesity

A study led by researchers of Baylor University revealed that the variety in the utilization of market-gained nourishments outside of a traditional diet routine can prove to be a reason for obesity in children, whether they do physical activities or not.
ANI
PUBLISHED ON JAN 23, 2021 07:02 PM IST

A study led by researchers of Baylor University revealed that the variety in the utilization of market-gained nourishments outside of a traditional diet routine can prove to be a reason for obesity in children, whether they do physical activities or not.

"The importance of a poor diet versus low energy expenditure on the development of childhood obesity remains unclear," said Samuel Urlacher, PhD, assistant professor of anthropology at Baylor University, CIFAR Azrieli Global Scholar, and lead author of the study.

"Using gold-standard measures of energy expenditure, we show that relatively lean, rural forager-horticulturalist children in the Amazon spend approximately the same total number of calories each day as their much fatter peri-urban counterparts and, notably, even the same number of calories each day as children living in the industrialized United States," he added.

"Variation in things like habitual physical activity and immune activity has no detectable impact on children's daily energy expenditure in our sample," he said.

The study 'Childhood Daily Energy Expenditure Does Not Decrease with Market Integration and Is Not Related to Adiposity in Amazonia' -- is published in The Journal of Nutrition, the American Society for Nutrition's flagship journal, and was funded by the National Science Foundation.

"That initial result alone is exciting in confirming our prior finding of relative stability in children's daily energy expenditure across different lifestyles and environments," Urlacher said. "But our study goes further. It shows that Amazonian children who eat more high-calorie market foods -- but not those who spend fewer calories every day -- consistently have more body fat."

"Together, these findings support the view that change in diet is likely the dominant factor driving the global rise in childhood obesity, particularly in the context of rapid urbanization and market integration in low- and middle-income countries," he said.

The global rate of overweight/obesity among school-age children and adolescents has risen from 4 per cent in 1975 to 18 per cent as of 2016, according to the NCD Risk Factor Collaboration. That reflects a major global health crisis. Children who are overweight/obese often remain so into adulthood. They have shorter life expectancy and a greater lifetime risk of developing non-communicable diseases, including Type 2 diabetes and heart disease.

"While the most rapid rise in childhood overweight and obesity is now in rural areas and in low- and middle-income countries, few previous studies have actually measured, rather than simply estimated, children's energy expenditure in these settings to identify the cause of energy imbalance," Urlacher said.

To investigate school-age children's diets and energy expenditure during early market integration and transition to overweight/obesity, Urlacher and co-researchers* collected data among 43 rural and 34 peri-urban Shuar children in Amazonian Ecuador. The Shuar are a large indigenous population of around 50,000. Children in the rural study sample live in a geographically isolated region and rely predominantly on a subsistence-based lifestyle based on hunting, fishing, foraging and small-scale horticulture.

In contrast, children in the peri-urban study sample live in a regional market center with access to roads, a hospital, stores, restaurants, and other market amenities.To measure variation in market integration among households, researchers collected information on things such as income and access to running water.

They also measured children's physical activity using wearable devices and immune activity by measuring biomarkers in minimally invasive finger-prick blood samples. Most importantly, the researchers measured children's daily energy expenditure using the "doubly labeled water" stable isotope-tracking method and children's resting energy expenditure using respirometry - both participant-friendly, gold-standard techniques.

The study found that:

Peri-urban children average 65 percent more body fat than rural children, with more than a third of peri-urban children classified as overweight compared to zero rural children.

Peri-urban children eat more than four times as many market-acquired items as rural children. Peri-urban and rural children have similar levels of physical activity.

Peri-urban children spend 108 calories per day less than rural children while at rest. This is related in part to 16-47 percent lower levels of immune activity.Measures of market integration, immune activity, and physical activity have no detectable impact on children's overall energy expenditure, with peri-urban and rural children spending roughly the same number of calories.

Variation in consumption of market foods, but not in daily energy expenditure, is related to children's body fat.

The study is the first to measure children's energy expenditure across market integration in a single population simultaneously with measures of diet, physical activity, and immune activity. The finding of no effect of market integration on measured daily energy expenditure is consistent with previous reports among adults and infants, Urlacher said. It also supports an evolutionary model of childhood energy constraint and allocation trade-offs described in detail by the researchers in their 2019 paper published in the journal Science Advances.

By measuring multiple aspects of the energy balance equation simultaneously, the researchers believe that their findings provide persuasive evidence for a likely primary role of changing dietary intake, rather than reduced daily energy expenditure, in driving the rise in childhood obesity in many populations.

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