Stacey Campbell was on the Adipose Industries diet and took one tablet per day for three weeks.
Biography
Donna Noble visited Stacey, pretending to be from Adipose Industries. Stacey was preparing to dump her boyfriend. Donna started playing with an Adipose pill necklace, which triggered parthenogenesis in Stacey. Stacey saw an Adipose; Matron Cofelia detected the unscheduled parthenogenesis and activated full parthenogenesis, killing Stacey. Stacey's body swelled then collapsed into a pile of clothes, from which several Adipose emerged. (DW: Partners in Crime)