What is the difference between Food Neophobia and Taste Aversion?

Neophobia is the innate avoidance of *unfamiliar* foods to prevent initial poisoning, whereas Taste Aversion is a *learned* avoidance of a specific food after it has caused illness.

How does the 'Evolutionary Mismatch' explain modern obesity?

Our ancestors evolved to crave high-calorie fats and sugars because they were rare and essential for survival. In modern environments where these foods are abundant and cheap, these once-helpful cravings lead to overconsumption and health issues.

Why is the preference for meat considered an evolutionary adaptation?

Meat provided a dense source of protein and calories that supported brain growth and provided long-lasting energy between successful hunts, giving meat-eaters a survival advantage.

What is a common mistake when explaining why ancestors liked sweet foods?

A common error is suggesting ancestors 'chose' to like sugar to survive. Instead, it should be explained that individuals with a natural mutation for sweet preference survived longer and reproduced more, passing that trait down.

Why is it incorrect to say that all food preferences are learned from parents?

Research on newborns shows they display innate facial expressions of pleasure for sweet tastes and disgust for bitter tastes before any social learning or feeding experience has occurred.

What error occurs if one ignores the role of 'Biological Preparedness' in taste aversion?

One might wrongly assume that any stimulus (like a loud noise) paired with illness would cause an aversion. In reality, evolution has prepared us to specifically link internal illness with the taste of food.

Define the 'Environment of Evolutionary Adaptation' (EEA).

The EEA refers to the ancestral conditions and selective pressures (such as food scarcity and predators) that shaped the behavioral and physical traits of modern humans over millions of years.

What is 'Biological Preparedness' in the context of eating?

It is an evolved predisposition to quickly learn associations that are vital for survival, such as the one-trial learning that occurs when a specific taste is linked to subsequent vomiting.

What does the term 'Adaptive Significance' mean?

It refers to the degree to which a trait or behavior enhances an individual's fitness (survival and reproductive success) in a particular environment.

Why do humans have an innate dislike for bitter tastes?

In nature, bitterness is a primary sensory marker for toxins and poisons. An innate dislike protected ancestors from ingesting lethal substances found in many plants.

Evolutionary Explanations for Food Preferences | AQA A-Level Psychology

Eating behaviour: Option Topic (Section C)

Evolutionary Explanations for Food Preferences

Summary

Evolutionary psychology posits that modern human food preferences are adaptations shaped by the Environment of Evolutionary Adaptation (EEA). Our ancestors faced constant threats of starvation and poisoning, leading to the natural selection of traits that favored high-energy, nutrient-dense, and safe foods. These innate predispositions, such as a liking for sweetness and a fear of new foods (neophobia), persist today, though they may lead to health challenges in modern environments where such foods are overabundant.

1. Definition & Core Concepts

Evolutionary Psychology: The study of how human behaviors, including food choices, are the result of psychological adaptations that evolved to solve recurrent problems in human ancestral environments.
Environment of Evolutionary Adaptation (EEA): The ancestral environment (primarily the Pleistocene epoch) where selective pressures shaped the human genome. During this time, food was scarce, unpredictable, and often dangerous.
Adaptive Significance: The idea that a trait or behavior persists because it provided a survival or reproductive advantage to ancestors, such as the ability to identify high-calorie fuel sources.

Diagram showing the shift from caloric scarcity in the EEA to caloric surplus in the modern world, illustrating the 'mismatch' theory.

2. Preferences for Energy-Dense Foods

Sweetness: Preference for sweet tastes is innate (present at birth) because sweetness typically indicates high-carbohydrate, non-toxic energy sources like ripe fruit.
Fatty Foods: Fat provides the highest energy density (9 calories per gram). Ancestors who preferred fat were better equipped to survive periods of famine and store energy for reproduction.
Salt (Sodium): Essential for physiological functions like nerve signaling and fluid balance. Since salt was rare in ancestral diets, a specific 'salt hunger' evolved to ensure adequate intake.

3. Protective Mechanisms: Neophobia & Taste Aversion

Food Neophobia: An innate reluctance to ingest new or unfamiliar foods. This serves as a 'biological safety net' to prevent the accidental consumption of toxins, peaking during early childhood when children begin exploring independently.
Taste Aversion (The Garcia Effect): A powerful form of classical conditioning where an individual develops a strong dislike for a food after it is paired with gastrointestinal illness.
Biological Preparedness: Humans are evolutionarily 'primed' to associate sickness with food rather than with external factors like light or sound, as food is the most likely source of internal poisoning.

4. Key Distinctions

5. Exam Strategy & Tips

6. Common Pitfalls & Misconceptions