Every human being is functionally made up of three doshas, Vata, Pitta and Kapha.Still, all human beings behave different in different environments. Some are comfortable in cold, some in very hot climate. Some have resistance for spices, some not. Some have very good strengths, others a weak constitution. In a nutshell Vata, Pitta and Kapha are the basic functions of all the human bodies. Each individual body has their own individual proportion and Intensity of these three doshas. This proportion is called the natural state, prakriti.
If we know our natural constitution according to vata, pitta, and kapha, we can take care of our problems and defend against diseases. We can know what sort of diseases are possible in us in different seasons, and can know how to prevent them before they attack us.