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Overweight Toddlers Likely to Be Obese Teens

September 5, 2006

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Children who are overweight as toddlers or preschoolers are more likely to be overweight or obese in early adolescence, report researchers in a collaborative study by the NIH and several academic institutions.

The researchers periodically collected height and weight measurements of a sample of children, beginning at age 2 and continuing until age 12. Their analysis, appearing in the September Pediatrics, provides some of the strongest evidence to date that overweight in early childhood increase the chances for overweight in later life.

"These findings underscore the need to maintain a healthy weight beginning in early childhood," said Duane Alexander, M.D., the Director of NIH's National Institute of Child Health and Human Development, which funded the study. "Contrary to popular belief, young children who are overweight or obese typically won't lose the extra weight simply as a result of getting older."

A large number of studies have found that obesity persists from childhood, through adolescence and into adulthood. Obese adolescents are likely to become overweight adults and, as such, at risk for the complications of obesity -- cardiovascular disease, high blood pressure, stroke, and diabetes.

Most previous studies have collected height and weight information only from a few intervals in childhood and 1 or 2 intervals in later life.

The strength of the current analysis is that it was conducted on data collected during frequent intervals over an extended period of time, from age 2 through age 12, explained the study's principal investigator, Philip R. Nader, M.D., Professor Emeritus of Pediatrics at the University of California, San Diego, School of Medicine.

Dr. Nader added that the children who took part in the study were born in 1991, and so were growing up during the current trend of overweight and obesity in the general population.

For the study, researchers followed the development of more than 1000 children from across the United States, enrolled in the study at birth. Although the study sample was not nationally representative of the United States as a whole, the sample did include children from ethnically diverse and economically disadvantaged households. More than 80 percent of the children in the study grew up in two-parent families.

For the most part, the study focused on gathering information relevant to children's experience in various childcare arrangements. However, measurements of the children's height and weight were collected when the children were ages 2, 3, 4 ½, 7, 9, 11, and 12.

For the current analysis, the researchers calculated body mass index, or BMI, for children in the study. BMI is a standard measure calculated from an individual's height and weight. Children were classified as overweight if their BMI was at or above the 85th percentile in comparison to national statistics for children their age.

The researchers found that children who were overweight at least once from ages 2 to 4 ½ were 5 times more likely to be overweight at age 12 when compared with children who were not overweight from ages 2 to 4 ½.

The more times a child was overweight from ages 7 through 11, the greater the chances the child would be overweight at age 12 in comparison with children who were not overweight from ages 7 through 11. For example, a child who was overweight once during the elementary school years was 25 times more likely to be overweight at age 12 than was a child who was not overweight during the elementary school period.

Similarly, when compared with children who were not overweight, children who were overweight twice during the elementary period were 159 times more likely to be overweight at 12, and children overweight 3 times during elementary school were 374 times more likely to be overweight at 12.

Dr. Nader said the study results strongly suggest that parents concerned about their children's weight should speak to their children's pediatricians about helping their children establish more healthful diet and exercise patterns. Because pediatricians regularly measure their patients' height and weight, Dr. Nader added, they are in an excellent position to proactively advise parents if they see signs of unhealthful weight gain.

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