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Study Reveals Key Amino Acid Deficiencies in Vegan Diets Despite Adequate Protein Intake

New research highlights lysine and leucine shortfalls in long-term vegans, urging dietary diversification and further study.

Many plant-based foods are of lower protein quality compared with meat
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Overview

  • A PLOS One study found that while 75% of long-term vegans met daily protein needs, only 50% met requirements for lysine and leucine.
  • The study used digestibility-adjusted analysis of four-day food diaries from 193 vegans in New Zealand to assess amino acid intake.
  • Lysine and leucine were identified as the most limiting essential amino acids due to lower levels in plant-based foods.
  • Experts recommend incorporating diverse plant proteins like legumes, nuts, seeds, quinoa, and soy to address amino acid gaps.
  • Researchers call for further investigation into strategies to boost lysine and leucine intake in nutritionally balanced vegan diets.