Fasting can significantly change how the body fuels itself. When you go without food for longer periods, the body shifts away from using incoming carbohydrates and begins relying more on stored fuels (including fats, protein/muscle). For individuals living with mito, where energy production may already be less efficient, this shift can add metabolic stress and may worsen symptoms for some individuals.
Clinical care standards for mitochondrial disease specifically emphasize preventing catabolism (a state where the body breaks down stored energy and tissue) and recommend avoiding prolonged fasting, particularly around illness, procedures or other stressors.
Because mitochondrial disorders are highly variable, always consult the specialist overseeing your mitochondrial disease care before trying fasting, intermittent fasting or any restrictive eating approach. The “right” strategy must match the diagnosis and the individual, not what is trending online.
