Nutrition can be defined as diet, food, maintenance or nourishment. Think of nutrition as the building blocks of life.The essential nutrients for life include carbohydrates, proteins, and lipids (fats), as well as fiber, vitamins, minerals, and water—the solvent for all soluble ingredients in the blood and cells. The absorption of nutrients starts the moment we begin to digest our foods, as they are transported to assist all the metabolic processes in the human body.
As molecular biology, biochemistry and genetics advance, nutrition has become more focused on the steps of biochemical sequences through which substances inside us and other living organisms are transformed from one form to another – metabolism and metabolic pathways.
Nutrition also focuses on how diseases, conditions and problems can be prevented or lessened with a healthy diet.
Nutritional science studies how the body breaks food down (catabolism) and repairs and creates cells and tissue (anabolism) – catabolism and anabolism = metabolism. Nutritional science also examines how the body responds to food.
Proteins are large molecules consisting of amino acids which our bodies and the cells in our bodies need to function properly. Our body structures, functions, the regulation of the body’s cells, tissues and organs cannot exist without proteins.
Carbohydrates are sugars that the body uses for energy. Simple carbohydrates, also called simple sugars, provide the body with quick energy. They are found in fruit, milk and white sugar. Complex carbohydrates, known as fiber and starch, are broken down in the body slower than simple carbohydrates. They are found in vegetables, bread, rice, oatmeal, whole grains and peas.
Your body needs Fat to grow and to process vitamins. There are many different kinds of fats. Polyunsaturated and monounsaturated fats are good for your body. These fats include nuts and fish, as well as olive, peanut, safflower and canola oil. Other kinds of fat, including saturated and trans fat, also called hydrogenated oils, can increase the risk of certain diseases. Saturated and trans fats are found in butter, fried foods, baked goods, fast food, whole milk and in meat from animals. All Fats are not bad. Omega 3 considered as a good fat(HDL).
Research has confirmed that omega-3 fatty acids can have an excellent effect on impacting degenerative diseases, such as heart disease, hypertension, rheumatoid arthritis, Alzheimer’s, diabetes, and many others.
The question is one of quantity, of course, since by analogy with some fat-soluble vitamins (or, in fact, most nutritional factors) more does not necessarily imply better, and toxicity may occur.
Macro-nutrients, as opposed to macro-nutrients (protein, carbohydrates and fat), are comprised of vitamins and minerals which are required in small quantities to ensure normal metabolism, growth and physical well‐being.
These are essential organic nutrients, most of which are not made in the body, or only in insufficient amounts, and are mainly obtained through food.
These are inorganic nutrients that also play a key role in ensuring health and well‐being. They include the trace elements copper, iodine, iron, manganese, selenium and zinc together with the macro elements calcium, magnesium, potassium and sodium.