Evidence check: LCT in the context of Haut

The evidence linking LCT (lactase persistence) to skin health is weak. LCT determines lactose digestion; a direct effect on skin is not established. Some observational studies suggest a possible link between dairy intake and acne, but results are inconsistent and confounded by diet, hormones, and genetics. GWAS on skin conditions (e.g., acne) have not found significant associations with LCT variants. Therefore, the evidence is best classified as 'unclear' or 'mixed'. A DNA test for LCT cannot predict skin issues. If you have skin concerns, consult a dermatologist rather than changing your diet based on a genetic test. Safety note: eliminating dairy without medical guidance may lead to calcium and vitamin D deficiency.