Environmentally Optimal, Nutritionally Sound, Protein and Energy Conserving Plant Based Alternatives to U.S. Meat

Area of Science:

• Nutritional science
• Environmental science
• Sustainable agriculture

Background:

• Meat production is resource-intensive compared to plant-based protein sources.
• Shifting to plant-based diets offers potential environmental and health benefits.
• Nutritional adequacy of plant-based alternatives to meat requires careful consideration.

Purpose of the Study:

• To identify and develop nutritionally sound plant-based meat alternatives.
• To minimize environmental impacts including cropland, nitrogen fertilizer (Nr), and greenhouse gas (GHG) emissions.
• To assess the potential public health benefits of these alternatives.

Main Methods:

• Developed a novel methodology to identify challenging nutritional constraints for plant-based diets.
• Modeled optimal diets that satisfy nutritional requirements while minimizing resource use.
• Evaluated the impact of replacing meat with plant-based alternatives on resource consumption and emissions.

Main Results:

• Protein-conserving plant-based meat alternatives meeting nutritional constraints exist.
• Optimal diets are shaped by constraints including energy, mass, fatty acids, vitamins B3, B12, D, choline, zinc, and selenium.
• Replacing meat could reduce U.S. cropland, Nr, and GHG emissions by 35-50% while eliminating pastureland use.
• Diet-related irrigation needs may increase by 15%.

Conclusions:

• Nutritionally sound and resource-efficient plant-based meat alternatives can be developed.
• These alternatives offer significant reductions in cropland, nitrogen fertilizer, and greenhouse gas emissions.
• While challenging to implement widely, plant-based diets present a viable strategy for multidimensional resource use reduction.