Nutrition can be defined as the process by which an organism obtains food which is used to provide energy and materials for its life sustaining activities.

Proteins are the chief body builders of the body. They are complex molecules made up of carbon, hydrogen, oxygen and nitrogen (sometimes sulphur and phosphorus). Proteins are used to synthesize enzymes , hormones , carrier proteins , contractile proteins , structural proteins , and protective proteins. They also form skin pigments like melanin and nucleic acids of the genetic material, DNA and RNA - purines and pyrimidines.

Fats are the main energy storers of the body. On oxidation, fats give almost two and a half times the energy as that of glucose or glycogen. This makes it most suitable for energy storage. It, however, uses up more oxygen molecules during oxidation when compared to carbohydrates as it contains lesser oxygen.

Vitamins are a complex group of organic compounds that are required in small quantities for regulation of various body activities. Though they are needed in small quantities, they are essential for our well being.

Minerals are inorganic nutrients. They include both metallic and non-metallic elements, which are taken by the body in the form of salts. There are 24 elements that are used in our body. They have various functions such as formation of tissues such as the bone, conduction of nerve impulses, formation of RBCs, etc. Prostate Cancer A new resource for UK healthcare professionals with information about prostate cancer, including statistics on incidence and prevalence, as well as treatment options and outcomes.