Composition differences between organic and conventional meat: a systematic literature review and meta-analysis

Area of Science:

• Nutritional Science
• Food Science
• Agricultural Science

Background:

• Consumer demand for organic meat is high, driven by perceived nutritional benefits.
• Limited systematic reviews exist comparing nutrient content between organic and conventional meat.
• Fatty acid (FA) profiles are a key area of interest in meat composition.

Purpose of the Study:

• To systematically review and meta-analyze the nutrient composition of organic versus conventionally produced meat.
• To identify significant differences in key nutritional compounds, particularly fatty acids.
• To explore potential reasons for observed compositional differences.

Main Methods:

• Meta-analysis of sixty-seven published studies comparing organic and non-organic meat.
• Analysis focused on nutritionally relevant compounds, including minerals, antioxidants, and fatty acids.
• Statistical analysis to detect significant differences and assess heterogeneity.

Main Results:

• Evidence for minerals and antioxidants was insufficient for meta-analysis.
• Significant differences in overall fatty acid profiles were detected.
• Organic meat showed higher concentrations of total polyunsaturated fatty acids (PUFA) and omega-3 PUFA (23% and 47% higher, respectively).
• Saturated fatty acids (SFA) were similar, and monounsaturated fatty acids (MUFA) were slightly lower in organic meat.
• High heterogeneity was observed, potentially explained by animal species and meat types.

Conclusions:

• Organic meat has a more favorable fatty acid profile, with increased PUFA and omega-3 PUFA.
• Organic farming practices, especially forage-based diets, likely contribute to these differences.
• Further research is needed for a broader range of nutrients and species-specific FA profiles.