Acohn
There was a posting a few days ago about a recent 6 month trial with women participating, I quote.

Recently reported following a 6 month study. As reported in Medscape Medical News.

53 healthy obese female volunteers with mean body mass index of 33.6 (± 0.3) kg/m2 were randomized to six months of either an ad libitum very low carbohydrate diet or a calorie-restricted diet with 30% of the calories as fat; 42 women (79%) completed the trial.

Both groups reduced caloric intake by comparable amounts at three and six months. Compared with the low-fat diet group, the low-carbohydrate diet group lost more weight (8.5 ± 1.0 vs. 3.9 ± 1.0 kg; P < .001) and more body fat (4.8 ± 0.67 vs. 2.0 ± 0.75 kg; P < .01).

Mean levels of blood pressure, lipids, fasting glucose, and insulin were within normal ranges in both groups at baseline and improved during the study, but there were no differences between the two groups at three or six months. Beta-hydroxybutyrate increased significantly in the low-carbohydrate group at three months (P = .001)indicating ketosis, but normalised at 6 months.

Would this support your point that ketosis kicks in and then fades away as the body finds other ways to obtain its nourishment ??