Other children with autism may have digestive problems which interfere with the absorption of nutrients. Moreover, many children with autism remain indoors because they require supervision during outdoor activity. Lack of exercise hinders proper bone development, she said. Similarly, if children remain indoors and are not exposed to sunlight, they may not make enough vitamin D, which is needed to process calcium into bones.

The boys in the study who were on a casein-free diet had the thinnest bones. In fact, the 9 boys who were on a casein-free diet had bones that were 20 percent thinner than normal for children their age. Boys who were not on a casein-free diet showed a 10 percent decrease in bone thickness when compared to boys with normal bone development.


The study authors wrote that bone development of children on casein-free diets should be monitored very carefully. They noted that studies of casein-free diets had not proven the diets to be effective in treating the symptoms of autism or ASD.

Only 9 boys on casein-free diets were available to participate in the study, Dr. Hediger said. When conducting a scientific study, it's easier to obtain statistically valid results by studying a larger number of individuals than with a smaller number of individuals. However, the dramatic difference in the boys' bone thickness when they were either on a casein-free diet or an unrestricted diet and when compared to normally developing bones strongly suggest that the bone thinning the researchers observed was statistically valid.

The researchers recommended that larger studies be conducted to confirm their results.

Until those studies can be conducted, Dr. Hediger offered the following advice: "Our study shows that it couldn't hurt - and would probably help - if parents of children with autism or autism spectrum disorder consulted with a dietitian during their children's routine medical care to make sure that their diets are balanced."

General information about autism and ASD is available from the NICHD's Web site, at http://www.nichd.nih.gov/publications/pubs/autism/overview/index.cfm.

The NICHD sponsors research on development, before and after birth; maternal, child, and family health; reproductive biology and population issues; and medical rehabilitation. For more information, visit the Institute's Web site at http://www.nichd.nih.gov/.

The National Institutes of Health (NIH) - The Nation's Medical Research Agency - includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. It is the primary federal agency for conducting and supporting basic, clinical and translational medical research, and it investigates the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit www.nih.gov.

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