Metabolic Fuel

Running on fat fuel provides stable, sustained energy throughout the day. Vitamins alone cannot compensate for metabolic fuel problems. The body can run on two fuel sources: glucose (sugar) and fat (ketones). Potassium deficiency directly impairs sodium-potassium pump function, manifesting as fatigue, muscle weakness, and poor endurance. Running on sugar as a fuel produces unstable energy with spikes followed by crashes. Keto fatigue is not caused by ketosis itself but by potassium and B vitamin deficiencies triggered by the dietary shift.