Do Junk Food Be Makin Kids Stupid?

ImageSource
A study recently published in the BMJ's Journal of Epidemiology and Community Health found a small but significant IQ difference between 8 year olds who had been raised largely on "junk food" diets, and those who had been fed a "health conscious" diet most of their lives.

The conclusion, published on Monday, comes from a long-term investigation into 14,000 people born in western England in 1991 and 1992 whose health and well-being were monitored at the ages of three, four, seven and eight and a half.

Parents of the children were asked to fill out questionnaires that, among other things, detailed the kind of food and drink their children consumed.

Three dietary patterns emerged: one was high in processed fats and sugar; then there was a "traditional" diet high in meat and vegetables; and finally a "health-conscious" diet with lots of salad, fruit and vegetables, pasta and rice.

When the children were eight and a half, their IQ was measured using a standard tool called the Wechsler Intelligence Scale.

Of the 4,000 children for which there were complete data, there was a significant difference in IQ among those who had had the "processed" as opposed to the "health-conscious" diets in early childhood.

The 20 percent of children who ate the most processed food had an average IQ of 101 points, compared with 106 for the 20 percent of children who ate the most "health-conscious" food.

"It's a very small difference, it's not a vast difference," said one of the authors, Pauline Emmett of the School of Social and Community Medicine at the University of Bristol.

"But it does make them less able to cope with education, less able to cope with some of the things in life." _France24_via_DiversityIsChaos

In this type of population study, it is important that as many potential "confounders" be identified and corrected for, as possible. Ethnicity and socioeconomic status are particular confounders for IQ. Without adequate adjustments and corrections for confounding at all stages of the study, the results will not be particularly reliable -- even with such a large number of subjects included.

The current study, based on the Avon Longitudinal Study of Parents and Children, uses data on children's diet reported by parents in food-frequency questionnaires at 3, 4, 7 and 8.5 years of age. Dietary patterns were identified using principal-components analysis and scores computed at each age. IQ was assessed using the Wechsler Intelligence Scale for Children at 8.5 years. Data on a number of confounders were collected, and complete data were available for 3966 children. _PaperAbstract

Are the results of this study meaningful? Correlation is not causation, particularly when so many factors come together to form a child's IQ score on any given testing day. Multiple IQ scores would be more helpful than a single score, and naturally every little detail of the study's methodology would need to be dissected. Still, 4,000 subjects can provide a study with a lot of "power." If the scores were adjusted and corrected for SES and ethnicity, the findings may be important.

As always, it should be noted that childhood IQ is likely to change as a person grows to adulthood. And in terms of life success, sound executive function (EF) of the frontal lobes is more important overall, than high IQ -- although both sound EF and high IQ together work better than either one singly. A pity that there is no single easy way to test for the many parameters of a sound EF.

Boys Should be Breast-Fed Until at Least Age 6

Startling new research from Australia demonstrates that boys -- but not girls -- should be breast-fed until at least age 6, to achieve optimal academic performance.

Breast feeding improves later academic performance in boys but appears to have no such effect in girls.

Wendy Oddy at the Telethon Institute for Child Health Research in Subiaco, Western Australia, and colleagues, examined whether having been breastfed affected the test scores of over 1000 10-year-olds.

Studies have suggested that children who were breastfed have higher IQs than those who were not, but few separated out boys and girls. Mothers who breastfeed are on average wealthier and more educated, so Oddy's team accounted for these factors.

Boys who were mainly breastfed for at least six months [years ... per Al Fin Nutritional Institute] scored 9 per cent higher in mathematics and writing tests, 7 per cent higher in spelling and 6 per cent higher in reading, compared with boys fed with formula milk or breastfed for shorter periods. There were no significant differences in results for girls.

"We know that breast milk contains the optimal nutrients for development of the brain and central nervous system," says Oddy, but the gender differences were surprising.
Hormone link

Oddy points out that other studies have suggested boys are more vulnerable to stress and adversity during critical periods of brain development. She speculates this could be because girls seem to be protected by higher levels of oestrogen during childhood. She says the improved academic performance of boys could be explained by oestrogen in breast milk having similar neuro-protective effects.

Some studies have suggested that fatty acids uniquely present in breast milk explain research showing that it can help babies become more intelligent. Whether or not these fatty acids help in boosting IQ may be linked to the presence of certain gene variants involved in their processing.

A large randomised trial conducted by Michael Kramer at McGill University in Montreal, Canada, concluded that prolonged breastfeeding was linked to higher IQ and academic ratings by teachers in Belarussian children at age 6... _NS

Al Fin specialists in childhood nutrition recommend that boys be breast-fed until at least age 26, if not longer. You can never be too safe when it comes to childhood nutrition. Girls, as noted, are protected by high estrogen levels. Boys -- even boys in adulthood -- are left to fend for themselves.

Research at the prestigious Al Fin Institute suggests that even simulated breastfeeding -- sucking well developed female breasts that are not lactating -- exerts a strong protective effect on the male brain, at any age.  This was a fortuitous finding, since it is much easier to find non-lactating volunteers.

More research is needed. Here at the Institute we have need of volunteers possessing nice, firm, well-developed breasts, so as to refine our earlier studies. No more males are needed, however, since we filled our quota for males within the first five minutes after announcing the study.