What is the accepted amount of protein required per kilogram of body weight (the 'required' value) for adults?

• A. 0.34 g/kg
• B. 0.8 g/kg
• C. 1.2 g/kg
• D. 0.5 g/kg

Answer: (A)

Protein needs include a minimum amount that prevents deficiency and a higher recommended intake for maintenance across diverse people. The body loses nitrogen daily, and to keep tissues and metabolism stable, intake must at least match those losses. Based on nitrogen balance data, the minimum protein required for maintenance in adults is about 0.34 g per kilogram of body weight per day (often cited ~0.36 g/kg). This is the amount sufficient to cover basic turnover and obligatory losses. The higher value commonly given as the daily recommendation, about 0.8 g/kg, includes a safety margin to accommodate variability among individuals. Even higher intakes, such as 1.2 g/kg, may be used for athletes or certain conditions with increased protein needs. So the accepted minimum required amount is around 0.34 g/kg/day because it reflects the level needed to meet maintenance needs rather than the broader, higher recommendations.