Generated Summary
This document, a working paper from the Food System Economics Commission, presents an overview of policies designed to transform food systems. The study examines 33 policies, categorizing them based on their potential impact on various operational goals, including healthy diets, strong livelihoods, land restoration, climate-positive production, and resilient food systems. The paper delves into ten specific policies, providing a detailed review of impact evaluations for each. The methodology involves a comprehensive literature review and consultation with subject matter experts to assess the effectiveness and potential trade-offs of these policies. The research aims to inform policymakers about the tools and evidence needed to create more inclusive, health-supportive, and nature-positive food systems. The context is the need for a global food system transformation to address issues such as undernutrition, obesity, and environmental degradation.
Key Findings & Statistics
- Meat Tax: A global modeling exercise suggests a meat tax could increase the price of processed meat by an average of 25% and red meat by 4%. This could lead to a 16% decrease in processed meat consumption and a 9% reduction in deaths from red and processed meats, with 222,000 lives potentially saved annually. The tax could reduce greenhouse gas emissions from livestock production by 1.2% globally.
- Repurposing Agricultural Support: Research indicates that repurposing agricultural subsidies can help reduce emissions, but may negatively impact poverty, nutrition, and farmers’ incomes.
- Tax on SSB: A 10% tax on sugar-sweetened beverages (SSB) can reduce sales, purchases, and consumption of SSBs by approximately 10% on average. In middle-income countries, a 10% price increase on SSB could decrease calorie consumption by 20 to 160 calories per person per day.
- Fruit and Vegetable Subsidies: Subsidies of at least 10% can effectively increase fruit and vegetable consumption. In New Zealand, a 20% subsidy on fruits and vegetables could increase fruit consumption by more than 16% and vegetable consumption by 32%.
- Public Procurement: In Brazil, at least 30% of spending on the national school feeding program (PNAE) must be purchased from family farmers, though this requirement is not met by most municipalities.
- Reorienting Agricultural R&D: Studies suggest agricultural R&D can be a highly effective tool for poverty reduction.
- Nitrogen Tax: Nitrogen tax evaluations from Finland and Sweden show reductions of 11% and 6% respectively.
Other Important Findings
- Meat Tax: Tax rates must be high to reduce meat consumption. Meat taxes may be synergistic in improving health while addressing environmental problems, though trade-offs include potential regressivity and negative effects on biodiversity.
- Repurposing Agricultural Support: Removing farm subsidies globally can reduce emissions but has negative impacts on poverty and undernourishment.
- Behavioral Policies: Menu labeling and mobile phone interventions are showing promising impacts in high-income country contexts.
- Fruit and Vegetable Subsidies: These subsidies can have positive health impacts and may be most effective when combined with other interventions, like taxes on unhealthy foods.
- Public Procurement: Public procurement programs are widespread and can be used to achieve multiple goals, including healthier diets, economic benefits, and environmental outcomes.
- Reformulation: Regulations to reformulate processed foods to reduce salt, sugar, or trans fatty acids can improve health outcomes.
- Reorienting Agricultural Research and Development (R&D): Investments should prioritize more nutritious crops and poverty reduction, as well as sustainable farming methods.
- Carbon Tax: A carbon tax on agriculture could encourage less emission-intensive farming methods and reduce food losses.
- Nitrogen Tax: Nitrogen taxes are cost-effective and, if designed well, can reduce pollution, though they may affect production output and food security.
Limitations Noted in the Document
- The effectiveness of policies is often inconclusive due to methodological controversies or the need to account for local specificities.
- The impact and effectiveness of policies listed in Table 1 is not straightforward due to variation in methods and indicators used to evaluate policies, a lack of evidence for some policies, and context specificity, among other issues.
- Studies on fruit and vegetable subsidies often have limitations, including small sample sizes and short-term interventions.
- The effectiveness of behavioral policies varies, with menu labeling alone showing limited effectiveness, while mobile phone interventions and nudges in decision structure show more promise.
- Taxes on sugar sweetened beverages show mixed results, and lack of evidence of impact on long term health outcomes
- The document notes that a carbon tax in LDCs could be costly given low productivity.
Conclusion
The study emphasizes that no single policy is universally effective, as context and specific implementation details significantly affect outcomes. Behavioral policies show promise, particularly in high-income countries, while the impact of meat taxes and repurposing agricultural support requires careful consideration of trade-offs. Public procurement, especially in low- and middle-income countries, shows significant potential but lacks rigorous evaluation. A major conclusion from this study is that the effectiveness of various agricultural policies is highly dependent on their specific design, implementation, and the local context in which they are applied. The trade-offs between different goals, such as improving health, environmental sustainability, and economic equity, need careful consideration. The study stresses the importance of evidence-based policymaking, highlighting the need for more robust evaluations, especially in low- and middle-income countries. Research on the effectiveness of policies related to the food system may benefit from developing standard methods and indicators for measuring progress. Furthermore, impact evaluations that consider multiple policies and are able to show which policies have been most impactful would likewise fill an important gap. The paper emphasizes that policymakers should prioritize efforts to encourage or mandate reformulation of food products to reduce sodium or sugar, while acknowledging the challenges in assessing the impacts of various policies, particularly the nitrogen tax, which requires cautious evaluation due to the experiences of a relatively small number of countries. The overarching theme is that the transformation of food systems requires a multifaceted approach, tailored to the specific challenges and opportunities of each context.