Nutrition
Nutrition is the science that interprets the interaction of nutrients and other substances in food in relation to maintenance, growth, reproduction, health and disease of an organism. It includes food intake, absorption, assimilation, biosynthesis, catabolism, and excretion.
Quality
One shining quality lends a lustre to another, or hides some glaring defect.
William Hazlitt, Complete Works, vol. 9, ed. P.P. Howe (1932). Characteristics, no. 162 (first published anonymously in 1823).