NEW YORK — Obesity rates fell among US preschool-age children in 2010, reversing a trend of the past decade, according to the first national study to spot a decline in the condition among young children.
The rate of obese 2- to 4-year-olds from low-income families dropped 1.8 percent in 2010 from 2003, while it fell 6.8 percent for those who were extremely obese, the US Centers for Disease Control and Prevention reported in a research letter published Tuesday in the Journal of the American Medical Association.
Researchers attributed the decline to greater awareness of health problems caused by obesity as well as an increase in breastfeeding, which studies have shown can reduce the risk. Obesity can set up children for diabetes, heart disease, and even premature death, said Heidi Blanck, a study author.
‘‘We’ve flipped from going up to really now showing a decrease,’’ Blanck, acting director of the Division of Nutrition, Physical Activity and Obesity at the Atlanta-based CDC, said in an interview. ‘‘It’s a modest decrease but at least we’ve changed the direction.’’
Previous studies had shown that obesity levels may have reached a plateau in various age groups, she said.
Researchers used data from the Pediatric Nutrition Surveillance System, which includes about 50 percent of children eligible for US-funded maternal and child health and nutrition programs. The study included 27.5 million 2- to 4-year-olds from 30 states and the District of Columbia.
The prevalence of obesity dropped to 14.94 percent in 2010 from 15.21 percent in 2003, according to the report.
It was still higher than 13.05 percent in 1998.
While the percentage of preschoolers with extreme obesity declined to 2.07 percent in 2010 from 2.22 percent in 2003, it was still higher than 1.75 percent in 1998.
Of the 2.4 million included in the study in 2010, there were 359,222 obese and 49,772 extremely obese US preschoolers, Blanck said.