What to watch with Leaky Gut Test and weight loss?

A 'leaky gut' test (e.g., zonulin, lactulose/mannitol) is often marketed alongside weight loss, but evidence is weak. Intestinal permeability may be elevated in obesity, yet most commercial tests lack standardization and clinical validation. Weight loss itself improves gut barrier function, not the reverse. Be wary of exaggerated claims: a positive test alone does not justify expensive supplements or restrictive diets. Instead, focus on a balanced, fiber-rich diet (e.g., Mediterranean) and exercise. The PPARA variant rs1800206 (G allele) may modestly affect fatty acid oxidation, but the effect is small. Do not let single gene tests drive decisions. Evidence: mechanistic, limited. Sources: None directly from context.