Could ADHD Be Linked To Diet?

But a new study from Perth's Telethon Institute for Child Health Research has identified what researchers believe is a link between ADHD and a 'Western-style' diet in adolescents.

ADHD is a problem with abnormal inattentiveness, over-activity, impulsivity, or a combination. To be diagnosed with ADHD, children should have at least six attention symptoms or six activity and impulsivity symptoms -- to a degree beyond what would be expected for children their age.

Associate Professor Wendy Oddy, leader of Nutrition studies at the Institute, said the study examined the dietary patterns of 1800 adolescents from the long-term Raine Study and classified diets into 'Healthy' or 'Western' patterns.

"We found a diet high in the Western pattern of foods was associated with more than double the risk of having an ADHD diagnosis compared with a diet low in the Western pattern, after adjusting for numerous other social and family influences," Oddy said. "We looked at the dietary patterns amongst the adolescents and compared the diet information against whether or not the adolescent had received a diagnosis of ADHD by the age of 14 years. In our study, 115 adolescents had been diagnosed with ADHD, 91 boys and 24 girls."

A "Healthy" pattern is a diet high in fresh fruit and vegetables, whole grains and fish. It tends to be higher in omega-3 fatty acids, folate and fiber. A "Western" pattern is a diet with a trend towards takeaway foods, confectionary, processed, fried and refined foods. These diets tend to be higher in total fat, saturated fat, refined sugar and sodium.

"When we looked at specific foods, having an ADHD diagnosis was associated with a diet high in takeaway foods, processed meats, red meat, high fat dairy products and confectionary," Oddy said. "We suggest that a Western dietary pattern may indicate the adolescent has a less optimal fatty acid profile, whereas a diet higher in omega-3 fatty acids is thought to hold benefits for mental health and optimal brain function.

"It also may be that the Western dietary pattern doesn't provide enough essential micronutrients that are needed for brain function, particularly attention and concentration, or that a Western diet might contain more colors, flavors and additives that have been linked to an increase in ADHD symptoms. It may also be that impulsivity, which is a characteristic of ADHD, leads to poor dietary choices such as quick snacks when hungry."

Oddy said that while this study suggests that diet may be implicated in ADHD, more research is needed to determine the nature of the relationship.

ADHD is the most commonly diagnosed childhood mental health disorder and has a prevalence of approximately five percent. ADHD is known to be more common in boys than girls.