I have doubts about a couple of the assumptions implicit in this statement.
- The "Keto" diet particularly works. Last time I checked, the research suggested it worked about as well as any other elimination diet, or vanilla CR.
- The reason it works. Given that it works about as well as any other elimination diet, it's probably important for practitioners to adhere strictly, rather than continuing to consume the foods that made them fat; but successfully avoiding carbohydrate intake enough to trigger some particular level of ketosis is probably not a part of how it "works".
Neither of those assumptions were implicit in the statement. The keto diet is simply evidence that glucose elimination is possible for some people without an inpatient treatment. The context of this discussion is glucose elimination for cancer, not weight loss.
(There is a fad that people attempt to do X) + (the observable result is orthogonal to whether they successfully did X) => not very strong evidence that doing X is achievable
Dieting is notoriously difficult to follow 100%. And in this case that's important. In-patient, the intake is exactly what the dietician (and indirectly the doctor) prescribes. A better outcome could be expected.
That's not true, the Keto diet is a big fad and it only works if your diet is basically glucose free.