The amount of breast tissue removed during breast reduction surgery depends on the individual case and the desired outcome. Generally, the surgeon removes enough tissue to achieve a proportional and aesthetically pleasing breast size while also taking into consideration the patient's physical needs and preferences. In some cases, a substantial amount of breast tissue may be removed; in others, a smaller amount may be sufficient to achieve the desired result. The surgeon will discuss the amount of tissue removed during the pre-operative consultation, considering the patient's goals and concerns.