Nutritional Causality

Definition

Relationship of cause and effect establishing that a food or nutrient directly causes an effect on health, distinguished from a simple association or correlation.

How it works

Nutritional causality means that a change in the consumption of a food leads directly to a change in health status. This is distinct from correlation, where two variables increase together without a direct proven link.

Role

Establishing causality allows for distinguishing true nutritional recommendations based on solid evidence from simple coincidental associations.

Examples

• Established causality: supplementation with folic acid reduces neural tube anomalies
• Suggested association but causality not proven: chocolate consumption and longevity
• Potential causality: caloric restriction and weight loss
• Confusion: moderate alcohol consumption linked to longevity (vs other protective factors)

Recommendations

Demand evidence from intervention studies to accept assertions of nutritional causality. Be skeptical of titles claiming to prove causality based on observational studies. Search if the effect has a biological plausibility explaining the proposed mechanism of action.

Key takeaway

Causality is more difficult to prove than correlation, but it is necessary to justify reliable nutritional recommendations.

Related terms