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Pediatrics, Alison Presmanes Hill, Katharine E. Zuckerman, and Eric Fombonne have an article titled "Obesity and Autism."
The abstract:
OBJECTIVE: Overweight and obesity are increasingly prevalent in the general pediatric population. Evidence suggests that children with autism spectrum disorders (ASDs) may be at elevated risk for unhealthy weight. We identify the prevalence of overweight and obesity in a multisite clinical sample of children with ASDs and explore concurrent associations with variables identified as risk factors for unhealthy weight in the general population.
METHODS: Participants were 5053 children with confirmed diagnosis of ASD in the Autism Speaks Autism Treatment Network. Measured values for weight and height were used to calculate BMI percentiles; Centers for Disease Control and Prevention criteria for BMI for gender and age were used to define overweight and obesity (≥85th and ≥95th percentiles, respectively).
RESULTS: In children age 2 to 17 years, 33.6% were overweight and 18% were obese. Compared with a general US population sample, rates of unhealthy weight were significantly higher among children with ASDs ages 2 to 5 years and among those of non-Hispanic white origin. Multivariate analyses revealed that older age, Hispanic or Latino ethnicity, lower parent education levels, and sleep and affective problems were all significant predictors of obesity.
CONCLUSIONS: Our results indicate that the prevalence of unhealthy weight is significantly greater among children with ASD compared with the general population, with differences present as early as ages 2 to 5 years. Because obesity is more prevalent among older children in the general population, these findings raise the question of whether there are different trajectories of weight gain among children with ASDs, possibly beginning in early childhood.
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The Portland Business Journal, Elizabeth Hayes reports:
As to why children with autism may be at elevated risk, future studies will have to answer that, Hill said.
“I think there are a few interesting avenues for future research,” Hill said. “There are definitely some possibilities we weren’t able to explore.”
Hill said there could be a biological basis, or perhaps behaviors associated with the condition lead to weight problems.
“Some symptoms that might be manifested, like social withdrawal and increased sedentary behaviors, may be exacerbating weight gain among these kids,” Hill said. “It might be children with autism have fewer opportunities for active social play and behavioral challenges. They may have preferences for foods that are energy dense but not nutrient dense, and they may be picky eaters.
