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.
In your report
Where Lactose Intolerance Risk lives inside your Genomic Lifestyle Optimization Report.
Lactose Intolerance Risk renders as a dark-background card with a color marker calibrated to your specific variants. The card opens with the gene mechanism, shows your result at a glance via that marker, and closes with a practical, mechanism-led recommendation — what to eat, what to time, what cofactors to support.
Want to see what a real Mosaic dark card looks like? Walk through a sample report →
In context
Dairy Processing: the 2-insight cluster.
Lactose Intolerance Risk is one finding in a tightly-related cluster. Mosaic sequences the other 1 alongside it so you see the whole biology — not an isolated data point.
Questions people ask
About Lactose Intolerance Risk.
- How does my DNA influence lactose intolerance risk?
- How efficiently your body extracts what it needs from a meal is written in a network of genes that govern lactase persistence (MCM6), gluten response (HLA-DQ), insulin signaling (TCF7L2, IRS1), and the caffeine clearance enzyme (CYP1A2). Two people on the same plate can experience completely different downstream effects on energy, satiety, and inflammation.
- What kind of test do I need to see my Lactose Intolerance Risk result?
- Whole-genome sequencing at 30× clinical depth. Consumer SNP-chip tests like 23andMe or AncestryDNA only read ~0.02% of your DNA and miss most of the variants this analysis needs. Mosaic reads all 3 billion base pairs and produces the full 108-insight report.
- How is Lactose Intolerance Risk different from clinical lab testing?
- Clinical labs measure downstream biomarkers — blood levels, hormone values, metabolic byproducts — at a single point in time. Genomic insights like Lactose Intolerance Risk reveal the underlying variant that shapes the biology, which is constant for life. The two are complementary: labs show the current snapshot; genomics shows the long-term tendency and where lifestyle leverage is highest.
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One test. 108 personalized findings. All yours.
Order your Mosaic kit. Receive your raw genomic data and the full Genomic Lifestyle Optimization Report in 15–20 days.