Every person has its own constitution, it is reality that constitution of any person has a role in the development of the diseases, now we have to see what is its role in different ways of treatment.
Yes, the constitution of human has a great role in the development of diseases. It suffices to think of dieseases due to our genes, also called genetic diseases. Downs' syndrome is just an example. Of course, different genetic diseases have different forms of treament. Note, however, that our biological constitution, namely our genes or genotype, interacts with the physical and social milieu wherein we live. So, one's development of diseases may be due to (a) our genes: (b) he physical and social milieu in which we live; and (c) the interaction between (a) and (b), that is, our biological constituition is a set of possibilities or propensities whose actualization may occur in certain environment, but not in others.
Yes, human constituents has effect on our growth, health and disease control. The genetic make up of man has some effects on health. More so, some genotypes react to certain kind of foods and they intend creates allergies which eventually creates diseases.