Fat-Burning Switch
The point where fat becomes the primary fuel source after glycogen depletion.
When stored carbohydrates run low, the body begins to rely more heavily on fat for energy. This shift is gradual and depends on how long you have been fasting or restricting food. Once it happens, energy becomes more stable and less tied to frequent meals. Staying consistent with fasting helps your body reach this state more easily over time.
Related Topics
Related glossary terms
Action Loop
Repeating fasting, calorie control, and walking as the core routine.
Eating Window
A defined time period when food is consumed.
Fasting Arc
The predictable progression of physical and mental states during a fast.
Fasting Window
The period where no calories are consumed.
Fat-adapted State
A state where the body relies more on fat than carbohydrates for energy.
Metabolic Switch
The transition from burning carbs to burning fat.
Momentum Window
The period after a fast where fat burning remains elevated and hunger is reduced.
Refeed
The phase of eating after fasting where food and glycogen return.