Poor childhood diet linked to low IQ, suggests study

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A diet high in fats, sugars, and processed foods in early childhood may

result in lower IQ scores, while a diet rich in healthy foods packed with

vitamins and nutrients may work in reverse, suggests new research.

The study, published in BMJ’s *Journal of Epidemiology and Community Health*,

reports a* “weak but novel” *association between dietary patterns in early

childhood, and general intelligence assessed at eight and a half years of

age.

The results of the study suggest that the eating habits in early childhood –

particularly up until the age of three – may play a role in shaping the

development of the brain, and thus affect behaviour, learning performance

and IQ<http://www.foodnavigator-usa.com/content/search?SearchText=IQ & FromNews>in

later life.

*“In this population of contemporary British children, a poor diet,

associated with increased intake of processed

foods<http://www.foodnavigator-usa.com/content/search?SearchText=processed+foods\

& FromNews>,

fat and sugar, in early childhood may be associated with lower IQ at the age

of 8.5 years. In addition, a concurrent healthy diet may be associated with

higher IQ,”* said the researchers, led by Dr Kate Northstone from the

Department of Social Medicine at the University of Bristol, UK.

*The importance of healthy diets*

Commenting on the new study, Barbara Gallani director of food safety and

science at the UK’s Food and Drink Federation told FoodNavigator that it

would not be surprising if a healthy, balanced diet is important in IQ

development, *“just like it is generally for children’s health and growth.”*

She added that it is important for everyone, not just children, to eat a

wide variety of foods, noting that it is possible eat a healthy diet and

still include some ‘treat’ foods.

Gallani said that food manufacturers are leading the way when it comes to

providing clear labelling on foods, as well as changing recipes to make old

favourites healthier, which *“makes it even easier for parents to choose a

balanced diet that’s right for their families.”*

*An intelligent diet*

Northstone and her colleagues noted that previous research investigating

possible associations between nutrition and IQ in children have tended to

focus on the use of dietary supplements or on intakes of specific nutrients.

For example, several studies have examined the effects of vitamin

supplementation on IQ in children, with mixed results.

However, the authors said that studies investigating the long-term effects

of nutrition on intelligence are sparse and conflicting. *“In particular

…there appears to be little known about the effects of the diet in early

childhood on general intelligence later in life,”* they said.

*“We do not eat foods in isolation, rather consuming combinations of foods

in meals and snacks,”* explained the authors.

*“Assessing dietary patterns as opposed to individual foods or nutrients

allows to us take into account these intercorrelations, which may otherwise

be overlooked,”* they said.

The new cross sectional study, based on the Avon Longitudinal Study of

Parents and Children (ALSPAC), examined the links between dietary patterns

through early and mid-childhood (3 to 8.5 years) and IQ assessed at 8.5

years of age.

*Study details*

The researchers measured dietary patterns using principal-components

analysis (PCA), which provide overall summaries of dietary intake. The diet

data, measured at the ages of 3, 4, 7 and 8.5 was then examined for any

associations between diet and IQ in nearly 4,000 children.

Three consistent dietary patterns were found from PCA at each time point: a

‘processed’, ‘traditional’ and ‘health conscious’ pattern.

The ‘processed’ pattern was illustrated by foods containing high fat and

sugar content and by higher intakes of processed and convenience foods. The

‘traditional’ pattern was associated with consumption of generally home

cooked meat, poultry, potato and vegetables, whilst the ‘health-conscious’

pattern was predominantly made up from high intakes of salads, fruit,

vegetables, fish, pasta and rice.

*“On minimal adjustment, all dietary pattern scores were associated with IQ

with the exception of the ‘traditional’ pattern,”* said the authors.

Before adjustment for confounding factors (such as parental influence,

social and economic status, and other environmental factors) the researchers

observed that the ‘processed’ food pattern was negatively associated with IQ

at all ages, while the ‘health-conscious’ pattern at all ages were

positively associated with IQ.

However, after adjustment for a wide variety of potential confounding

factors, they reported that many associations between IQ and dietary pattern

were lost, and those that remained (‘processed’ pattern at three years and

‘health-conscious’ patterns at 8.5 years) *“were markedly attenuated”*,

according to the authors.

For the remaining relationships (after full adjustment) the ‘processed’ food

pattern at 3 years was found to be such that a one point increase in the PCA

score resulted in an almost two-point decrease in IQ at 8.5 years. Whilst

the ‘health-conscious’ pattern was associated with an increased in IQ of

1.20 points per one point increase in PCA pattern score.

*Interpretation*

Northstone and colleagues said that the results of the study suggest a more

*“long-term effect of diet on the child’s ability to ‘learn’,”* they noted

that this could be in part be explained by favourable growth of the brain in

early childhood – They noted that it is known that the brain grows at its

fastest rate during the first 3 years of life.

*“Studies have shown that head growth during this time is associated with

cognitive outcome, and it is possible that good nutrition during this early

period may encourage optimal brain growth,”* said the authors.

However, they added that given the levels of attenuation seen in the effect

sizes when adjusted for confounding factors, *“we cannot exclude the

possibility of residual confounding.”*

Source: *Journal of Epidemiology and Community Health*

Published online ahead of print, doi: 10.1136/jech.2010.111955

*“Are dietary patterns in childhood associated with IQ at 8 years of age? A

population-based cohort study”*

K. Northstone, C. Joinson, P. Emmett, A. Ness, T. Paus

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Ortiz, MS, RD

*The FRUGAL Dietitian* <http://www.thefrugaldietitian.com>

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