Myths vs facts: LCT and weight loss

Claims that LCT gene variants (lactase persistence) directly cause weight loss are not supported by strong evidence. LCT determines adult lactose digestion. In lactose intolerance, avoiding dairy may reduce bloating and calorie intake temporarily, but this is not a targeted weight-loss mechanism. Some marketing materials overstate metabolic benefits of LCT variants. Human studies are limited and confounded by diet, gut microbiome, and lifestyle. A consumer DNA test can reveal your LCT status, but weight loss is multifactorial. Evidence: unclear. Caveat: Do not base weight-loss decisions solely on LCT genotype.