How are LCT and Blutzucker related?

The relationship between LCT (lactase gene) and blood sugar (Blutzucker) is indirect, mediated by lactose metabolism. The LCT gene encodes lactase, which breaks down lactose into glucose and galactose. In individuals with lactase persistence (e.g., rs4988235 T allele), lactose is efficiently digested, leading to a modest rise in blood glucose after dairy consumption. In lactase non-persistence (lactose intolerance), undigested lactose reaches the colon and is fermented by bacteria, typically causing gastrointestinal symptoms rather than a significant blood sugar increase. Some observational studies suggest a link between LCT variants and type 2 diabetes risk, possibly through dairy intake affecting insulin secretion or inflammation. However, the evidence is mixed and insufficient for clinical recommendations. A genetic test alone does not predict current blood glucose levels. Caveat: diet and lifestyle are major confounders. MyBody-X tests are not a substitute for medical diagnosis.