Sex and age Mean protein intake Low-protein diets Medium-protein diets High-protein diets Very-high-protein diets g % (<100% RDA) % (100–150% RDA) % (150–200% RDA) % (200% RDA) Males     20–29 y 104 15.3 31.2 28.3 25.2     30–39 y 103 15.8 30.1 30.2 23.9     40–49 y 95 17.2 39.5 25.0 18.3     50–59 y 90 21.8 38.2 25.3 14.7     60–69 y 84 24.1 46.4 22.1 7.4     >70 y 73 37.7 46.0 13.8 2.5 Females     20–29 y 66 27.2 44.8 18.1 9.9     30–39 y 65 29.4 44.3 17.7 8.6     40–49 y 64 29.0 45.8 18.8 6.4     50–59 y 64 29.9 45.8 19.2 5.1     60–69 y 60 31.8 46.9 17.5 3.8     >70 y 57 41.1 41.6 13.5 3.8 1Adapted from reference 2.

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