Four methods of estimating protein allowance from nitrogen balance data. This was considered the true coefficient of the protein requirement for adults. In the three successive studies, four of six, five of six, and three of four subjects, respectively, were in negative nitrogen balance. This was rounded to the final value proposed of 0.75 g good-quality protein per kilogram per day. The 1985 recommendations for all age groups are summarized in table 3.
Values are for protein sources such as eggs.
The meeting concluded that there was no likelihood of or need for extensive additional multilevel nitrogen balance data on young adults in the foreseeable future. The participants in this meeting recognized the need for additional data on the protein needs of the elderly obtained in compliance with strict methodological criteria. Some of the earlier data on both younger and older adults are subject to criticism on methodological grounds. The potential for error and bias has led some to reject nitrogen balance data in their entirety. It is foolish to accept poor data or to fail to recognize the limitations of good data, but it is equally inappropriate to reject reliable data as long as their limitations are recognized.