The Civil Code of 2002 regulates the acts of own body disposal while living in its 13 th article determinating the impossibility of permanent diminish of the physical integrity and the respect of morality as limits for the exercise of body autonomy, with the except of the acts practiced under medical demand or with therapeutic finality. Under the perspective of the constitutionalization of the Civil Law, the guardianship of the personality appears as an outspread of one of the Republics fundamentals on the private sphere: the human dignity principle, which implies not only the guardianship of physical integrity, but also the respect of existential private autonomy as a way to assure the free development of the personality. In that sense, the analysis proposed is set off with the premises of the body and mind dualism surpass through the notion of psychophysics integrity, and the biopower as the foundation of the interdictions in the juridical sphere suffered by the body autonomy. It is in this line that the present dissertation intends to search the elements in order to interpret the referred legal device of the brazilian civil code.