Certain essential amino acids are most frequently deficient in a strict vegan diet
Evidence consistently shows that unsupplemented strict vegan diets often present challenges regarding protein quality due to lower concentrations and bioavailability of certain essential amino acids compared to omnivorous diets.
The retrieved literature (e.g., papers 0, 4, and 9) consistently emphasizes that plant-based and strict vegan diets often have lower essential amino acid density and poorer distribution of indispensable amino acids, making certain essential amino acids more frequently deficient or limiting without careful dietary planning or complementation. No papers refuted this premise.
Joseph J. Matthews, E. Arentson-Lantz, Paul J. Moughan, Robert R. Wolfe, A. Ferrando, David D. Church. Understanding Dietary Protein Quality: Digestible Indispensable Amino Acid Scores and Beyond. 2025. https://doi.org/10.1016/j.tjnut.2025.07.005
Reviews indicate that plant-derived proteins often exhibit a lower protein quality characterized by a poorer distribution and density of essential amino acids.
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Soh BXP, Smith NW, von Hurst PR, McNabb WC. Achieving High Protein Quality Is a Challenge in Vegan Diets: A Narrative Review.. 2025. https://doi.org/10.1093/nutrit/nuae176
Highlights that plant-sourced proteins provide a poorer distribution of indispensable amino acids and lower digestibility compared to animal-sourced foods.
Kübra Topaloğlu Günan, Perihan Yolcı Ömeroğlu. Evaluation of Plant-Based Egg Substitutes in Vegan Muffins: Functional, Structural, and Nutritional Characterization. 2025. https://doi.org/10.3390/foods14173012
Notes that plant-based alternative formulations frequently display lower levels of essential amino acids.
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