Study bolsters evidence that severe obesity increasing in young US kids

NEW YORK — A new study adds to evidence that severe obesity is becoming more common in young U.S. children.

There was some hope that children in a government food program might be bucking a trend in obesity rates — earlier research found rates were dropping a little about a decade ago for those kids. But an update released today in the journal Pediatrics shows the rate bounced back up a bit by 2020.

The increase echoes other national data, which suggests around 2.5% of all preschool-aged children were severely obese during the same period.

“We were doing well and now we see this upward trend,” said one of the study’s authors, Heidi Blanck.

The study looked at children ages 2 to 4 enrolled in the Women, Infants and Children program, which provides healthy foods and other services to preschool-aged children in low-income families. The children were weighed and measured.

The researchers found that 2.1% of kids in the program were severely obese in 2010. Six years later, the rate had dipped to 1.8%. But by 2020, it was 2%. That translates to about 33,000 of more than 1.6 million kids in the WIC program.

Significant increases were seen in 20 states with the highest rate in California at 2.8%. There also were notable rises in some racial and ethnic groups. The highest rate, about 2.8%, was in Hispanic kids.

Experts say severe obesity at a very early age is nearly irreversible, and is strongly associated with chronic health problems and an early death.

It’s not clear why the increase occurred, Blanck said.

When WIC obesity rates dropped, some experts attributed it to 2009 policy changes that eliminated juice from infant food packages, provided less saturated fat, and tried to make it easier to buy fruits and vegetables.