There is a hard limit of ketogenesis: about 185g of ketone bodies per day [0].
(That's about 2 lbs every 3 days).
[0] https://www.diapedia.org/metabolism-insulin-and-other-hormon...
(That's about 2 lbs every 3 days).
[0] https://www.diapedia.org/metabolism-insulin-and-other-hormon...
Not a viable alternative to dieting and exercise, of course, but maybe an alternative to liposuction or gastric-bypass surgery.