The Claim

The prevalence of the lactase non-persistence CC genotype is 73.3% in Czech Roma and 23.6% in Czech Slavs.

Source: Frequency of adult type-associated lactase persistence LCT-13910C/T genotypes in the Czech/Slav and Czech Roma/Gypsy populations

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
41score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Description
1 study reviewed
In plain English

Among Czech Roma adults, 73.3% carry a genetic variant associated with reduced lactose digestion, while among Czech Slavs, 23.6% carry this variant.

See the scientific wording

The prevalence of the lactase non-persistence CC genotype is 73.3% in Czech Roma and 23.6% in Czech Slavs, indicating that the majority of Roma adults are genetically unlikely to digest lactose efficiently, while most Slavs retain this ability.

Why this might work

After weaning, a change in DNA near the lactase gene turns off the production of the enzyme that breaks down milk sugar, so adults cannot digest lactose.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: Frequency of adult type-associated lactase persistence LCT-13910C/T genotypes in the Czech/Slav and Czech Roma/Gypsy populations

    The study found that 73% of Czech Roma have a gene version that makes them unable to digest milk as adults, while only 24% of Czech Slavs have it — meaning most Roma can't digest milk, but most Slavs can. This matches the claim perfectly.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

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