Ketosis for weight-loss, ketosis for neurological health, ketosis as it naturally happens to "help you through the night".... And yet, people talk about it as though it was a single entity, brought about in one particular way. It obviously isn't.
Back when Robert Atkins started talking about it, you didn't hear much from other sources. I suspect his main reason was to set minds to rest, who were concerned about the sound-alike (at that time) condition of ketoacidosis -- he needed to explain to people and their doctors that the phenomenon they were seeing with their keto-strips was NOT pathological. Since then (largely through the writings of Volek, Phinney, et al) it has turned into the cornerstone of low-carb weight-loss efforts.
After pursuing the pink pee-stick for a couple of years, I've come to the conclusion that it's getting WAY too much attention.
Getting into ketosis is an important milestone for previous predominantly-glucose-burners. When new to it, while they're still feeling crummy because their bodies are not adept at harvesting energy from burning their own fat, it's REASSURING to know that they're suffering for a good purpose! One can put up with more discomfort if one is aware that they're making progress thereby. (What's depressing is starvation on a conventional low-cal diet plan and having NO sign that anything good is happening.)
But ... WHY is that strip pink? Originally, in Atkins' day, it meant that you were burning your own fat -- YOUR FAT was the source of the ketones. Nowadays, more often than not, the ketones are being manufactured from the fat YOU ARE EATING. It's coming from the coconut oil in your fat-bombs, from the butter on your eggs, from the MCT oil in your smoothie.
I suspect that courting high ketones without paying attention to the source of the ketones is slowing down a lot of people's weight loss!
The REASON we should be eating a certain (large) percentage of fat in our diets is because we want its satiating and energizing properties. Unless we're sick abed, we need to fuel ourselves, and we sure as hell don't want to be hungry. As soon as we have eaten the number of grams of complete protein our bodies want, we aim at "filling up" with fat in the place of the carbs we USED to be fueled by....
But to push ourselves to eat more fat than we really want to, because we haven't reached some rosy threshold of blood ketones? In my humble opinion -- MISTAKE.
If our aim is weight loss, we want our blood and urinary ketones to reflect how much of OUR OWN fat we're burning, not how much of a coconut's it is. ;-) To measure higher ketones when we're trying to treat a neurological problem is a whole 'nother issue!