The term nutrition defines as “ the science of food, the nutrients and the substances there in, their action, interaction process by which the organism ingests, digests, absorbs, transports, utilizes, and excretes food substances” by American medical association.
The nutrients are absolutely come from food. Food provides both the energy and the nutrients needed to build and maintain all body cells. Nutrition is the only key to developing and maintaining a state of health that is optimal for human being. Not consuming enough essential nutrients in younger years also makes people more likely to suffer health consequences in later years, such as bone fractures from the disease osteoporosis. Iron deficiency anemia is another possibility. At the same time, taking too much of a nutrient supplements such as vitamin A, vitamin D, vitamin B-6, calcium or copper can be harmful.
The combination of poor diet and too little physical activity is indirectly the second leading cause of death. In addition, obesity is also considered the leading cause of death.(smoking is the first). The increase knowledge of nutrition can reduce the risks for common health problems.
Nutrients can be assigned to three functional categories: (1) those that primarily provide people with energy; (2) those that are important for growth and development (and later maintenance); (3) those that act to keep body functions running smoothly. The energy-yielding nutrients make up a major portion of many foods.
The science of nutrition evolved primarily from the disciplines of physiology, chemistry and medicine. The relationship between food and maintenance of health has a long history, beginning some 2400 years ago in Greece during the time of Hippocrates. The bible even contains references to the importance of certain foods, such as beans for maintain health.
The science of nutrition began in the 1600s in Europe. By 1830, it was known that foods contain three major constituents: proteins, carbohydrates and fats. By 1915, a nutrition experts knew that six minerals, four amino-acids, and three vitamins-A, B (later shown to be a group of vitamins), and the anti-scurvy factor (later shown to be ascorbic acid, which also known as vitamin C) – were essential nutrients. Over the past 30 years, interest in nutrition has grown.
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