Introduction
Human nutrition is the science that interprets the interaction of nutrients and other substances in food (e.g. phytochemicals, anthocyanins, tannins, etc.) in relation to maintenance, growth, reproduction, health and disease of an organism. It includes food intake, absorption, assimilation, biosynthesis, catabolism and excretion. The diet of an organism is what it eats; which is largely determined by the availability and palatability of foods. For humans, a healthy diet includes preparation of food and storage methods that preserve nutrients from oxidation, heat or leaching, and that reduce risk of food-borne illnesses. The seven major classes of human nutrients are carbohydrates, fats , fibers , minerals , proteins , vitamins , water . Nutrients can be grouped as macronutrients (needed in relatively large amounts) or micronutrients (needed in smaller quantities).