What is the dietary reference intake (DRI) for protein in grams per kilogram per day?

The dietary reference intake (DRI) for protein is established to ensure adequate nutrient intake while preventing deficiency. The correct range of 0.8 to 2.0 grams of protein per kilogram of body weight per day encompasses the general needs of various population groups, including sedentary adults, active individuals, and those undergoing muscle-building activities.

The lower end of this range, approximately 0.8 grams/kg/day, is the minimum sufficient amount to maintain nitrogen balance in adults and support basic physiological needs for maintenance and overall health. As activity levels and specific needs increase, such as in athletes or individuals engaged in intense physical training, the higher end of the protein intake could reach around 2.0 grams/kg/day, ensuring that additional requirements are met for muscle repair, growth, and maintenance.

This range is significantly backed by research indicating that higher protein intakes can be beneficial in specific circumstances, such as weight loss or muscle hypertrophy, but generally, the average adult needs around 0.8 grams/kg. Thus, the DRI should reflect both the common dietary requirements and the physiological variations seen across different lifestyles.