Lactose Intolerance Risk
Most adults down-regulate lactase after childhood—it's the ancestral norm. Knowing your persistence level predicts whether milk, yogurt, and ice cream will stay friends or become enemies. No more wondering if it's "just in your head."
What this measures
How your DNA shapes lactose intolerance risk.
LCT codes for lactase — the enzyme that breaks down lactose into glucose and galactose for absorption. In most mammals, lactase production switches off after weaning. In humans, a regulatory variant in MCM6 (upstream of LCT) keeps lactase production active into adulthood — a trait called lactase persistence.
Carriers of the MCM6 -13910 T allele are associated with sustained lactase production and reliable dairy tolerance. CC homozygotes are associated with reduced production after early childhood — and the pattern of bloating, gas, and discomfort that follows undigested lactose reaching the colon. Persistence is the derived trait; non-persistence is the human default.
Lactase production isn’t trainable, but the gut can be supported. Aged cheeses (cheddar, parmesan) and fermented dairy (yogurt, kefir) contain far less lactose than milk. Lactase enzyme supplements work for occasional exposure. Calcium and vitamin D need attention regardless of dairy strategy.
"Trying again" with milk after a bad reaction usually produces the same reaction, because the enzyme isn’t coming back. Which variant you carry changes whether dairy is a default food group or one that needs strategic handling — and which forms make sense to keep in rotation.
Lactose Intolerance Risk is one specific finding in this system. Your Genomic Lifestyle Optimization Report shows where your variants place you on the metabolism and digestion spectrum — and what you can do about it: it renders as a dark card with a color marker calibrated to your variants, opening with the gene mechanism and closing with a practical, mechanism-led recommendation.
Want to see what a real Mosaic dark card looks like? Walk through a sample report →
In context
Food & Beverage Processing: the 9-insight cluster.
Lactose Intolerance Risk is one finding in a tightly-related cluster. Mosaic sequences the other 8 alongside it so you see the whole biology — not an isolated data point.
Questions people ask
About Lactose Intolerance Risk.
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