Human nutrition
The protein requirement for each individual differs, as do opinions about whether and to what extent physically active people require more protein. The 2005 Recommended Dietary Allowances (RDA), aimed at the general healthy adult population, provide for an intake of 0.8 grams of protein per kilogram of body weight. A review panel stating that "no additional dietary protein is suggested for healthy adults undertaking resistance or endurance exercise."
Cat food
Protein content between cat foods can vary anywhere from a low protein content of 26% to a content as high as 50% or above. The National Research Council (NRC) recommends protein content for cat diets is to be around 20% for adult maintenance and 21.3% for growth and reproduction The Association of American Feed Control Officials (AAFCO) recommendations however suggest a higher protein level of 26% for adult maintenance and 30% for growth and reproduction.