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Where did you get that they were on a keto diet? All I can see is that they were given the ketones after an overnight fast.
Ketones do have signalling properties, some of what we see in people who are starving will be modulated by ketones. But yeah, ketones are a trait of starving, not starvation itself.
Oh. I put 1/2 and 1/2 together and got 2. Reading "After a period of fasting..." + "artificially increasing blood ketone levels" I took as meaning they were in ketosis and took keto pills to increase their ketones. It was the use of "increasing" which I assumed meant they were in measurable ketosis at the time they took their pills.