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."
Nutritional yeast
Nutritional values for nutritional yeast vary from one manufacturer to another. On average, two tablespoons (about 30 ml) provides 60 calories with 5 g of carbohydrates (four grams of which is fiber). A serving also provides 9 g of protein and is a complete protein, providing all nine amino acids the human body cannot produce. While fortified and unfortified nutritional yeast both provide iron, the fortified yeast provides 20 percent of the recommended daily value, while unfortified yeast provides only 5 percent. Unfortified nutritional yeast provides from 35 to 100 percent of vitamins B1 and B2.