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Dietary protein requirement of younger and older men

For older men, the Estimated Average Requirement (EAR) and Recommended Dietary Allowance (RDA) for dietary protein are not known with confidence. Limited data suggest that they might be greater than the assumed EAR and RDA of 0.66 and 0.80 g protein·kg BW−1·d−1, respectively. To assess the effect of age on the EAR and RDA, 22 healthy men, 12 younger (Y, 21–43 yr) and 10 older (O, 63–79 yr), completed three 18‐day trials with protein intakes of 0.50, 0.75, and 1.00 g·kg−1·d−1. Nitrogen balance (Nbal) was determined using data from total nitrogen analyses of duplicate food composites and complete urine and feces collections from days 14–17 of each trial. Each subject’s protein requirement was estimated using linear regression of protein intake and Nbal data from all three trials and inverse prediction. The EAR was not different between Y and O (0.56 ± 0.14 (0.55) vs. 0.65 ± 0.09 (0.66) g·kg−1·d−1; mean ± SD (median)). Using the individual requirement estimates from Y and O combined (5% trimming and variation estimated by the bootstrap) an adequate protein allowance for men was calculated to be 0.85 ± 0.20 g·kg−1·d−1, a value not different than the RDA. These short‐term nitrogen balance results suggest that older men do not have a greater need for total protein than younger men and that the allowance estimate does not differ from the RDA