Association between the seven-repeat allele of the dopamine-4 receptor gene (DRD4) and spontaneous food intake in pre-school children.

Dopamine-related differences in food choice are visible by preschool age

Dopamine signaling contributes to how rewards attract attention and motivate behavior. This study asked whether a variation in the dopamine D4 receptor gene was associated with food choices as early as four years of age.

Observing choices directly and through family reports. Researchers studied 150 children from a Canadian birth cohort. At a laboratory snack meal, children could choose from available foods, allowing the team to calculate energy and nutrient intake. Mothers also reported their children’s habitual food consumption. These two measures addressed related but different questions: what a child selected in a particular setting and what they usually ate at home.

The genetic comparison concerned the seven-repeat version of DRD4, which had previously been studied in relation to dopamine function and adult eating behavior. Analyses compared carriers and non-carriers while accounting for current body mass index and examining differences between girls and boys.

The laboratory and everyday patterns were not identical. Girls carrying the seven-repeat version consumed more fat and protein during the snack meal than girls without it. That pattern was not found in boys. Across both sexes, the food reports indicated that carriers consumed more ice cream and fewer servings of vegetables, eggs, nuts and whole bread.

These findings place a dopamine-related association with food choice early in development, before adult eating habits and many later metabolic problems are established. They also show why food preference should not be reduced to total calories: specific foods and nutrients can differ, and an association may depend on sex or the setting in which eating is measured.

The study did not measure brain dopamine or establish that the gene variant caused the choices. Follow-up is needed to determine whether these early patterns persist, how they interact with the food environment, and whether they contribute to later weight or health outcomes.