Isocaloric substitution of animal-protein with plant-protein is associated with lower all-cause mortality (ACM) and cardiovascular mortality (CVM).
Replacing 3% or 5% of total caloric intake from animal-protein with plant-protein was linked to a significant reduction in ACM, with no meaningful difference between the two substitution levels. For CVM, both substitution levels showed significant risk reductions, but the 5% substitution was associated with a notably stronger protective effect than the 3% substitution. Overall, the findings support increasing plant-protein intake relative to animal-protein as a dietary strategy aimed at reducing mortality.
Key words: Isocaloric substitution, Plant-based protein, Plant-rich diet, All-cause mortality, Cardiovascular mortality, Cancer mortality
Key learning objectives and takeaways for healthcare professionals
This research offers HCPs evidence-based insights to support discussions around shifting the balance of dietary protein sources toward plant-based foods to help reduce mortality risk. Some of the key concepts discussed within the study include:
- Evidence that even modest dietary shifts (3–5% of total energy, roughly equivalent to swapping one daily serving of red or processed meat for legumes, nuts, soya, or whole grains) are associated with meaningful reductions in all-cause and cardiovascular mortality.
- The observation that cardiovascular benefit appears to scale with the size of the substitution, with a larger (5%) shift from animal- to plant-protein showing a more pronounced risk reduction than a smaller (3%) shift.
- Possible biological mechanisms underlying these associations, including differences in branched-chain amino acid intake, Insulin-like Growth Factor (IGF-1), lipid profiles, or exposure to contaminants associated with processed animal-protein sources.
- How this evidence can inform more specific, actionable dietary counseling and improved food-based dietary guidelines that move beyond general recommendations to "reduce animal protein" toward the more precise message of actively replacing it with plant-based protein sources.
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This publication is shared under the Creative Commons Attribution 4.0 International License (CC BY 4.0), which permits use, sharing, and adaptation with appropriate credit to the original authors.
