People on the ketogenic diet hope to suspend their body in that state, burning up reserves of fat instead of carbohydrates. Then, using urinalysis strips (read: peeing on small, chemically sensitive pieces of paper), people on the diet can monitor the level of ketone bodies in their system based on the resulting color of the strips.
The diet itself consists of cutting out all carbohydrates, eating only foods high in fat and protein. And since it’s not necessarily the most pleasant relationship to have with food, as The Atlantic reports, one company is working on a beverage that introduces ketone bodies into the bloodstream apparently without the need for fasting and cutting out the same foods the ketogenic diet calls for. The company is making claims (of which Buzzfeed and other sources are quite skeptical) that introducing ketone bodies into the bloodstream will enhance physical and cognitive performance.