The fetal programming of food preferences: current clinical and experimental evidence.

How prenatal nutrition may shape appetite and food reward

Why might a shortage of nutrients before birth be associated with a preference for energy-rich foods many years later? This review brings together human and animal evidence and examines the systems that could carry a prenatal influence into later eating behavior.

Food choice reflects both need and reward. Homeostatic regulation keeps energy supply aligned with the body’s needs through signals such as insulin, leptin and appetite-related brain peptides. Hedonic regulation concerns the attraction and pleasure associated with food. These systems communicate: metabolic signals can influence the reward value of a food, while its appeal can influence eating even when immediate energy needs are met.

The review describes studies linking being born small for gestational age with later preferences for highly palatable foods, including foods rich in carbohydrate or fat. Findings vary with age and study setting. That variation matters because a neonatal taste response, a preschool snack choice and an adult dietary pattern are different observations along a developmental trajectory.

Several biological pathways could contribute. Experimental research suggests that prenatal undernutrition can alter responsiveness to insulin and leptin, the regulation of appetite and fullness, and dopamine pathways involved in motivation and reward. The review also considers the stress-response system, including cortisol, because stress signaling can influence both metabolism and food choice. These mechanisms may interact rather than provide competing explanations.

The behavioral extension of the thrifty phenotype hypothesis proposes that development under limited resources may influence how energy is sought as well as how it is used. If preferences for energy-rich food persist in an environment where such foods are abundant, repeated small differences in intake could contribute to metabolic risk over time.

The review organizes evidence for this possibility; it does not establish that every person born small follows the same trajectory or that one mechanism explains all findings. Its value is in connecting observations across ages with testable biological accounts of appetite and reward.