Introduction of Nutrition and Digestive System
Nutrition (also called Nourishment or aliment) is the provision, to cells and organisms, of the materials necessary (in the form of food) to support life. Many common health problems can be prevented or alleviated with a healthy diet.
The diet of an organism is what it eats, which is largely determined by the perceived palatability of foods. Dietitians are health professionals who specialize in human nutrition, meal planning, economics and preparation. They are trained to provide safe, evidence based dietary advice and management to individuals (in health and disease), as well as to institutions. Clinical nutritionists are health professionals who focus more specifically on the role of nutrition in chronic disease, including possible prevention or remediation by addressing nutritional deficiencies before resorting to drugs.
There are thousands of ecosystems of varying sizes on the earth’s surface. All living beings as well as the physical and chemical factors such as sun, soil, climate and water, are part of some ecosystem and all these ecosystems are interconnected in some way or the other. Ecosystem is basically a unit consisting of biotic (living) and abiotic (non-living) factors in a particular area that are linked together through a nutrient cycle and flow of energy. The sun is the fundamental source of almost all ecosystems on this earth and the radiant energy form the sun flows through the various components of the ecosystem by a nutrient and energy cycle. The biotic or the living components of the ecosystem are divided into two categories – Autotroph and Heterotroph. Let us read about them in detail.
iasmania
