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September 13, 2007

BehindTheMedspeak: Fear of new foods is genetic

Hpijo

That's the conclusion of Dr. Lucy J. Cooke and colleagues at University College, London, whose August, 2007 paper in the American Journal of Clinical Nutrition found that approximately 80% of a child's tendency to avoid unfamiliar foods is inherited — not acquired.

Here's a WebMD report about the study.

    Picky Eating May Be Genetic

    Kids Inherit Fear of Unfamiliar Food, Twin Study Shows

    If your kids fear unfamiliar foods, don't blame your parenting — blame your genes.

    A study of 10,780 British twins shows food fear to be 78% inherited. Another 22% of food fear comes from environmental factors that affect one twin but not the other, report Lucy J. Cooke, MSc, of University College London and colleagues.

    "Parents can be reassured that their child's reluctance to try new foods is not simply the result of poor parental feeding practices but is partly in the genes," Cooke and colleagues suggest in the Aug. 1 issue of the American Journal of Clinical Nutrition.

    The researchers included four items to assess fear of unfamiliar food — they call it "food neophobia" — in questionnaires given to parents of 8- to 11-year-old twins as part of the U.K. Twins Early Development Study.

    The parents rated statements about their kids on a four-point scale ranging from "strongly agree to strongly disagree." The statements:

    • My child is constantly sampling new foods.

    • My child doesn't trust new foods.

    • My child is afraid to eat things s/he has never had before.

    • If my child doesn't know what's in a food, s/he won't try it.

    The researchers then compared results for fraternal twins (which have different genetic inheritances) to results for genetically identical twins. Identical twins were much more likely than fraternal twins to have the same degree of new-food phobia.

    The results indicate "a strong heritable component to variation in [food] neophobia," Cooke and colleagues conclude. "This is a robust finding. Genetic research has consistently shown that shared genes rather than shared experience largely accounts for similarities in behavioral traits between family members."

    Nevertheless, the researchers say parents should not despair if their child seems to have picky-eater genes.

    "Research in laboratory and real-world settings has shown that neophobia for specific foods can be reduced," Cooke and colleagues note. "New foods can become familiar, and disliked foods liked, with repeated presentation."

    The researchers warn that bribing kids to try new foods and punishing them for not eating are strategies that fail to achieve the intended effect.

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The abstract of the journal article follows.

    Genetic and environmental influences on children's food neophobia

    Background: Food neophobia in children has been associated with a low intake of fruit, vegetables, and protein foods. The design of effective interventions to improve children's diets would be facilitated by a better understanding of the determinants of neophobia.

    Objective: Our objective was to quantify the contribution of genetic and environmental differences to variation in child food neophobia.

    Design: Parents of twins aged 8-11 y (n = 5390 pairs) completed questionnaires about their children's eating habits, including a measure of food neophobia.

    Results: The results showed that neophobia is highly heritable. The heritability estimate from model fitting was 0.78 (95% CI: 0.76, 0.79). A further 22% of the variance was explained by nonshared environmental factors, with no influence of shared environmental factors.

    Conclusions: Neophobia appears to be a heritable trait, but almost a quarter of the phenotypic variation is accounted for by nonshared environmental factors. An important aim for future research is the identification of influential aspects of the environment specific to individual children.

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FunFact: cainotophobia (from the Greek kainos, new) is a synonym for neophobia.

Don't you feel smarter already?

I know I do.

'Course, around here there's an awful lot of upside....

September 13, 2007 at 10:01 AM | Permalink


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Comments

Beef twinkies....uuuuugh...

Posted by: Stephen Bove | Sep 14, 2007 1:37:57 PM

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