Protein-rich foods

There is no such thing as a pure protein food (i.e. one which contains 100 per cent protein).As can be appreciated from Table 11.1, even those foods that are highest in protein do not contain more than 45 per cent by weight, and even this value is exceptionally high. Because these foods vary widely in water content and in portion size the nutritional values are rather different. So some ‘protein-rich’ foods contribute little to nutrition.