RDA (Recommended Dietary Allowance)

The Recommended Dietary Allowance for protein in the United States is 0.8 grams per kilogram of body weight per day for healthy adults. This figure was set by the Food and Nutrition Board of the National Academies and is intended to cover the needs of 97-98 percent of the sedentary adult population. The key word is 'sedentary' — the RDA was never designed to optimize anything. It is a deficiency-prevention floor for someone with minimal physical activity. The figure has not changed substantially since 1989, even though decades of resistance training and aging research have pushed sport-nutrition organizations like the ISSN and ACSM to recommend 1.4 to 2.0 g/kg for active adults. Treating the RDA as your goal is like setting a thermostat to 'won't kill you' instead of 'comfortable.' For an active 70 kg adult, the difference between 56 grams (RDA) and 120 grams (active range) is the difference between basic survival and actually building or preserving muscle. The RDA still has a place: it is a useful baseline for medical settings, food labeling rules, and population-level public health. Just do not confuse it with personal optimization. Use the protein calculator to see all three benchmarks side by side and pick a target based on your goal, not just the legal minimum.