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Healthy diet 'boosts childhood IQ'

2011-02-08 10:46:15

Girl eating an apple Can diet affect intelligence?

Eating chips, chocolate and cake may be damaging to a child's intelligence,

according to researchers at Bristol University.

Their study suggests a link between a diet high in processed foods and a

slightly lower IQ.

Writing in the Journal of Epidemiology and Community Health, they suggest poor

nutrition may affect brain development.

The British Dietetic Association said more young parents needed to be educated

about healthy eating.

The eating habits of 3,966 children taking part in the The Avon Longitudinal

Study of Parents and Children were recorded at the ages of three, four, seven

and eight and a half.

The researchers said three types of diet emerged: Processed diets which were

high in fat, sugar and convenience foods, traditional diets of meat, potato and

vegetables, and health conscious diets of salads, fruit and fish.

The children all took IQ tests when they were eight and half.

Brain development

The researchers found a link between IQ and diet, even after taking into

account other factors such as the mother's level of education, social class and

duration of breast feeding.

A diet high in processed food at the age of three was linked to a slightly

lower IQ at the age of eight and a half, suggesting early eating habits have a

long term impact.

Dr Pauline Emmett, who carried out the study at Bristol University, said:

"Brain development is much faster in early life, it's when it does most of its

growing. It seems that what happens afterwards is less important."

Although the relationship between diet and IQ was very strong, the impact was

quite small. Processed foods were linked with IQs only a few points lower.

Experts in the field said the results had confirmed common sense.

Fiona Ford, spokesperson for the British Dietetic Association, said: "It's well

worth looking at the long term impact of diets, everyone's familiar with the

short term.

"The research confirms the type of advice we already know, but that's not

always enough. Sometimes a society has to help a person change, we need to be

educating more young parents about healthy eating."

Kristian Bravin, dietician at Leicester Royal Infirmary, said: "Most people

know what they should do, some people don't have the inclination to cook good

meals.

"I'm all in favour of a little bit of what you fancy, but when you're doing it

every week it's a problem.

"People should seek advice from a registered dietician, but simply it's a

message of moderating fat intake, five fruit and veg a day and whole grain

starchy foods."