What to watch with Leaky Gut Test and fatigue?

The leaky gut test (e.g., lactulose/mannitol test) is marketed as a measure of intestinal permeability, but it is not a clinically validated diagnostic tool. Fatigue has many potential causes: poor sleep, stress, nutrient deficiencies (iron, B12, vitamin D), thyroid dysfunction, or chronic inflammation. A positive leaky gut result alone does not reliably explain fatigue. The evidence linking gut permeability to fatigue is weak, mostly based on animal or mechanistic studies. MyBody-X may offer such tests, but their clinical utility is unclear. Be cautious: do not start restrictive diets or supplements based solely on this test. Have fatigue evaluated by a doctor (blood work, inflammation markers, hormones). The test can be a complementary data point, but it does not replace medical diagnosis. Watch out for exaggerated marketing claims: a leaky gut test does not tell you if you have a specific food intolerance or if a particular diet will cure your fatigue.