Season of birth, the dopamine D4 receptor gene and emotional eating in males and females. Evidence of a genetic plasticity factor?

Appetite
Tatjana van StrienJudith R Homberg

Abstract

Emotional eating has a female preponderance and an understanding of possible genetic and environmental underpinnings is still in the early stages. The current study focuses on the possible role of the dopamine D4 receptor (DRD4) 'plasticity' gene in emotional eating and the possible moderator effects of sex and season of birth therein. We tested this in two samples (n = 93 and n = 586) of male and female Caucasian adults by genotyping DRD4 and assessing self-reported emotional eating. Participants were defined as high risk carriers if they had at least one long (7-repeat) allele, which confers hypo-function to DRD4. We also ran analyses that grouped 2- and 7-repeat carriers together. In the first sample there only was a moderator effect of sex. In the second sample there also was a 3 way interaction between season of birth, sex and genotype. In line with the idea that the Drd4 gene functions as a plasticity gene that affects the sensitivity to environmental influences, the moderator effect of sex was only found for the participants born in fall. Only in females the hypo-functional variants of DRD4 were associated with significantly higher degrees of emotional eating. Furthermore, the sex × genotype effects were somewhat stronge...Continue Reading

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