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Children's Health

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Toddlers’ Diet May Affect IQ at Age 8

Study Shows Diet High in Processed Foods May Be Tied to Lower IQ Scores
WebMD Health News
Reviewed by Laura J. Martin, MD

Feb. 7, 2011 -- Three-year-olds who eat diets rich in fat- and sugar-laden processed foods may have slightly lower IQ scores at age 8 than their peers with healthier eating habits, a new study shows.

The small, but measurable, difference in IQ scores detected in the study between kids who ate the most processed foods at age 3 and kids who ate the least suggests that optimizing a young child’s diet may do more than help prevent obesity; it may also give kids a lasting brain boost.

Nutrition and IQ

Researchers followed nearly 4,000 children in Southwest England from birth through age 8. They asked their parents to fill out detailed questionnaires about their youngsters’ diets at ages 3, 4, 7, and 8 1/2.

Ready-to-eat foods high in fat and sugar were considered to be processed.

After adjusting for other things that may influence intelligence testing, like age, sex, and family income, researchers found that kids who ate diets high in processed foods at age 3 had slightly lower IQ scores by age 8 1/2.

The study also showed children who at age 3 ate what the researchers termed a “healthy diet” high in salad, fruit, vegetables, rice, and pasta had an associated higher IQ at age 8 and a half.

Dietary patterns between the ages of 4 and 7 appeared to have no impact on IQ.

The study was published online in the Journal of Epidemiology and Community Health.

Previous studies have suggested that early childhood nutrition may play a role in intelligence and brain development.

“We know already that breastfeeding has quite an effect on IQ, so it makes sense that there’s something going on with diet,” says study researcher Kate Northstone, from the School of Social and Community Medicine at the University of Bristol in the U.K. “I was surprised that we found this effect at 3 rather than 8. That for me is the interesting point. It was the 3-year-olds and what they ate, rather than, say, at 4, 7, and 8.”

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