Neural and Hormonal Mechanisms

The Role of Learning in Food Preference

Whilst evolutionary accounts explain universal food preferences, the enormous cultural and individual variation in what people eat — the range of foods considered edible, desirable, and appropriate — requires learning-based explanations. Social learning theory, classical conditioning, and cultural transmission all contribute to shaping the specific food preferences individuals develop within their evolutionary constraints.

Social Learning Theory (SLT) and Modelling

Bandura's social learning theory proposes that food preferences are acquired partly through observing and imitating others. Children are especially responsive to the food choices of peers, parents, and admired adults. Birch (1980) demonstrated peer modelling effects on food preference: children who initially disliked a vegetable were exposed to peers who enthusiastically ate it. After repeated peer modelling, target children's preferences shifted significantly towards the previously disliked food — and the shift persisted over time. Notably, the modelling effect was strongest when the peer model was slightly older and of the same sex, consistent with Bandura's prediction that similarity to the model increases imitation.

Addessi et al. (2005) found that young children prefer foods that a social partner is eating — they chose a differently coloured but identically flavoured food more often when a demonstrator was eating the same-coloured food. This demonstrates a social transmission mechanism independent of flavour.

Vicarious reinforcement: children observe peers praised or rewarded for eating particular foods and adjust their own preferences accordingly. Conversely, observing peers refuse or grimace at a food reduces preference for it.

Direct Reinforcement and Parental Practices

Direct reinforcement of food intake influences preference, though not always in the expected direction. Birch et al. (1980) showed that using food as a reward increases preference for the reward food — children who were given sweet snacks as rewards for drinking a preferred juice actually increased their preference for the juice. However, using food as a reward for eating another food ('eat your vegetables and you can have dessert') can decrease preference for the coerced food (vegetables) — the extrinsic reward signals that the food is undesirable (why would you need a reward to eat it?). This is the over-justification effect applied to food: extrinsic rewards undermine intrinsic motivation.

Repeated exposure (mere exposure effect, Zajonc, 1968) increases preference for foods: children shown 10–15 exposures to a novel food — without pressure — typically increase their preference for it. This underlies the recommendation that parents offer rejected foods repeatedly rather than giving up after one refusal.

Cultural Influences

Culture is one of the most powerful determinants of food preference, defining what counts as food, what is considered edible, which preparations are acceptable, and what foods carry status or symbolic meaning. Cultural variation demonstrates the extent to which food preferences are learned rather than fixed:

• Food taboos: universally common but culturally specific — pork is taboo for practising Muslims and Jews; beef for many Hindus; insects are taboo in most Western cultures but are eaten by approximately 2 billion people worldwide. These are not aversion to unpleasant tastes but culturally transmitted social rules.
• Acquired tastes: many preferred foods within cultures are initially aversive — coffee, alcohol, chilli, blue cheese, marmite. Preference develops through repeated exposure within a reinforcing social context.
• Media and advertising: food choice is influenced by advertising, celebrity endorsement, and social media. Research shows that children exposed to food advertising show increased preference for advertised products (Boyland and Halford, 2013).