In those studies KD led to an increase in fat oxidation during exercise, still it was not effective in improving performance in discipline-specific workouts . In a recent, very well controlled study by Burke et al. , it was found that KD led decreased performance in elite race walkers by impairing exercise economy and falling into lower end of the intensity spectrum.
Typically, if you range below 0.2 mllimole ketones per liter of blood, you are not considered to be in ketosis. Blood ketone meters are the more accurate way to measure your level of ketosis. They show an exact and real-time measurement of the ketones in your blood, which is considered the “gold standard.” The biggest drawbacks of the blood strips are that they can get expensive quickly. They cost about $1 per strip, and most insurance providers don’t cover them.