Human Amino Acid Requirements: Can the Controversy Be Resolved?

BACKGROUND 217 REQUIREMENTS BY NITROGEN BALANCE .... 219 E"ors in Nitrogen Balance Experiments ....... .. .. ....... . ...... ... ..... .. 220 Does Nitrogen Equilibrium Necessarily Mean Amino Acid Equilibrium? ....... . . 221 REQUIREMENTS FROM AMINO ACID OXIDA nON. . . . . . . . . . . . . . . . . . . . . . . . . 223 Brealc-Point Analysis . . . . . . . ... .... ... .. . .. 223 Tracer Balance Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224 AMINO ACID REQUIREMENTS DEDUCED FROM OBLIGATORY NITROGEN LOSS 232 OTHER FACTORS INFLUENCING REQUIREMENTS. . . . . . . . . . . . . . . . . . . . . . . . . 234 Criteria of Adequacy ....... .. . . . . . . . .. ...... 234 Amino Acid Production in the GI Tract . . . . . . . . . . . . . . . • . • . . . . . . . . . . . . . . . . . . 235 CONCLUSIONS AND SUGGESTIONS FOR FUTURE WORK . . . . . . . . . . . . . . . . . . 237