When kundalini awakens, the physical body actually undergoes many changes. Generally they are positive, but if your guru is not cautious, they can be negative also. When the shakti wakes up, the cells in the body are completely charged and a process of rejuvenation also starts. The voice changes, the smell of the body changes and the hormonal secretions also change. In fact, the transformation of cells in the body and brain takes place at a much higher rate than normal. These are just a few observations. However, scientific researchers are still taking their first steps into this field.