NEW YORK

America’s weight problem isn’t getting any better, according to new government research.

Overall, obesity figures stayed about the same: About 40 percent of adults are obese and 18.5 percent of children. Those numbers are a slight increase from the last report but the difference is so small that it could have occurred by chance.

Worrisome to experts is the rate for children and teenagers, which had hovered around 17 percent for a decade. The 2-to-5 age group had the biggest rise.

The years ahead will show if that’s a statistical blip or marks the start of a real trend, said the report’s lead author, Dr. Craig Hales of the U.S. Centers for Disease Control and Prevention.

The bad news is that the numbers didn’t go down, experts say. In recent years, state and national health officials have focused on obesity in kids, who were the target of the national Let’s Move campaign launched by former first lady Michelle Obama in 2010.

The report released today covers 2015 and 2016.

“This is quite disappointing. If we were expecting the trends to budge, this is when they would be budging,” said Andrew Stokes, a Boston University expert on tracking obesity.

The new figures are from an annual government survey with about 5,000 participants. The survey is considered the gold standard for measuring the nation’s waistline, because participants are put on a scale to verify their weight.

Obesity means not merely overweight, but seriously overweight, as determined by a calculation called body mass index. Until the early 1980s, only about 1 in 6 adults were obese. The rate climbed dramatically to about 1 in 3 around a decade ago, then seemed to level off for years.

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