
Nutrition is the science through which we study the processes living organisms use to acquire all the essential nourishment that enables them to live and grow.
The main focus is on nutrients, which are all those substances that the body needs but which it cannot make by itself. This includes vitamins and minerals and some macromolecules.
Nutrition is therefore concerned with your diet (what you put into your body) and metabolism (what happens to the substances once they enter your body)