Parthenogenesis

At Adipose Industries, parthenogenesis was the term used to described the process by which its customers' fat was converted into Adiposians. In crises, bone, hair, and internal organs could also be converted.

The process was activated by a bio-tuned pendant given to customers upon purchase of a three week pill diet. Matron Cofelia had a master inducer which activated full parthenogenesis in everyone who had taken an Adipose pill. (TV: Partners in Crime)

Behind the scenes
In biology, parthenogenesis is a form of where an egg can develop into an organism without fertilisation by a sperm cell.

Information from invalid sources
The gold pendants included bioflip-digital-stitch circuitry that allowed Matron Cofelia to track the Adipose after parthenogenesis. (NOTVALID: Doctor Who: The Encyclopedia)