Protein and Amino Acids Part 1—Basics Plant Protein and Amino Acids Protein Recommendations for Vegans Part 2—Research Dietary Reference Intakes Protein Needs for People Over 60 Protein and Amino Acid Content of Selected Plant Foods Protein Balance Studies Nitrogen Balance Methods Critiqued Protein Needs of Athletes Amino Acid Intakes and Blood Levels in Vegans Amino Acid Intakes of Vegans Amino Acid Blood Levels of Vegans Non-Protein Amino Acids Taurine and Carnitine Creatine Carnosine and beta-Alanine