Abstract
Protein stores are best defined as increments of body protein induced by intakes above the "minimum adequate" which can be called upon to meet situations of privation and stress. Observations on growing rats indicate that, according to the definition, useful protein stores cannot be demonstrated by the use of diets containing more than 15 per cent protein. Intakes below this figure must be regarded as the range of protein malnutrition. A surfeit intake above this figure will increase weight gain, but fails to improve resistance to the stress of protein deprivation.