Myths vs facts: LCT and Blutzucker

The link between LCT (lactase gene) and blood sugar is often misunderstood. Fact: Lactase persistence variants (e.g., rs4988235) determine adult ability to digest lactose. Lactose is broken into glucose and galactose, which raise blood sugar. Myth: Lactose intolerance means you must avoid all dairy – many tolerate small amounts, and lactose-free products prevent spikes. Another myth: Lactose raises blood sugar more than other sugars – its glycemic index is moderate. Genetic predisposition does not reflect current blood glucose; a DNA test can indicate tendencies but does not replace glucose monitoring. Caution: Those avoiding lactose should ensure adequate calcium and vitamin D intake. Evidence is strong for the genetics, but practical relevance for blood sugar is limited – individual tolerance and diet matter most.