Donna Simpson, 42, weighs more than 600 pounds (272 kg) and aims to reach 1,000 pounds (455 kg).
The mother of two children, ages 3 and 14, models on a website called supersizedbombshells.com, where admirers and the curious can pay to watch videos of her eating greasy foods or walking to the car.
She has appeared in television interviews and said she welcomes media coverage.
A Guinness World Records spokeswoman said Simpson has submitted a claim for the title of world’s heaviest woman to give birth, a claim that is being reviewed.
Among the heaviest women ever recorded was one who reportedly weighed 1,800 pounds (816 kg) and another who reportedly weighed 1,200 pounds (545 kg) at the time of their deaths.
Simpson said she has received a book offer and wants her own reality show, partly to give plus-size women more confidence. She wears size XXXXXL clothing, which she buys mostly online, and calls herself a member of the “fat acceptance community.”