Acharya Prashant explains that sensitivity is defined by the absence of the ego or the 'I'. When the ego interferes, sensitivity is destroyed. He distinguishes between the natural processes of the body and the demands of the mind, noting that the body naturally knows its requirements and does not seek to accumulate excessively. He suggests that if one stops thinking about the need for consumption, many perceived needs would vanish, whereas essential functions like breathing continue naturally. The speaker emphasizes that the ego's interference often hinders natural progress and harmony.