Carbs (sugars & starches) are the preferred fuel for your brain and muscles. They use carbs first, whenever they’re available.
This is why maintaining stable blood sugar can affect your attention, mood, and energy level.
However, when very low amounts of carbs are available for fuel, your body starts making compounds known as “ketones.” These are your body’s “backup fuel.” And your body makes them from fat.
Ketogenic literally means “the generation of ketones.”
After a while being on a diet very low in carbs, your blood level of ketones increases. This is the metabolic state known as “ketosis.” It’s the same process that your body goes through if you’ve fasted for 72 hours and depleted your supply of carbs as fuel. That’s the trigger for turning fat into ketones.
Pro Tip: “Ketosis” from a ketogenic diet is not the same thing as the dangerous condition known as “ketoacidosis.”