Myths vs facts: LCT and Abnehmen

The relationship between LCT (lactase persistence) and weight loss is often clouded by myths. A common myth is that lactose intolerance automatically leads to weight loss because people avoid dairy. In reality, eliminating dairy does not guarantee weight loss and may cause nutrient deficiencies (calcium, vitamin D). Another myth is that lactase persistence (the ability to digest lactose) is directly linked to a higher BMI. While some studies show regional correlations (e.g., in Northern Europe), the effect is small and confounded by diet and lifestyle. The fact is: the LCT variant determines lactose tolerance, not metabolic rate or fat burning. Weight loss depends on calorie balance, macronutrient composition, and physical activity. Those with lactose intolerance may experience temporary water loss from bloating or diarrhea, but this is not true fat loss. Evidence for a direct role of LCT in weight regulation is weak and mostly based on association studies. Therefore, marketing LCT tests for weight loss is not supported by science. A better approach is to focus on overall diet quality, including lactose-free options if needed, rather than relying on genetic tests for weight management.