Is there any peer reviewed data evidence on inbreeding, incest, cousin marriages with the Amish in USA and do they marry/ breed with non Amish ?- Genetic effects ?





Yes, there is data and research regarding inbreeding, cousin marriages, incest, and marriage patterns among the Amish in the USA. 

Here's a breakdown of the key points based on academic studies and genetic research:


1. Inbreeding and Cousin Marriages

  • Yes, the Amish do have a higher rate of consanguinity (marriage between blood relatives) than the general U.S. population, but close inbreeding (e.g., sibling or parent-child incest) is extremely rare and heavily taboo.

  • Cousin marriages, particularly second cousins or more distant, are not uncommon and generally permitted within many Amish communities.

  • First cousin marriages are much less common and are often discouraged, although not always forbidden, depending on the church district.

Why this happens:

  • The Amish population is a genetic isolate, descending from about 200 founders who immigrated to the U.S. from Switzerland and Germany in the 1700s–1800s.

  • The current population of over 375,000 is descended from this small group, so the gene pool is limited.

  • Genetic bottlenecks and endogamy (marrying within the group) naturally increase the chance of recessive genetic disorders.

🔸 2. Genetic Disorders Related to Inbreeding

  • Certain rare genetic disorders are more common among the Amish due to founder effect and inbreeding, such as:

    • Ellis-van Creveld syndrome (extra fingers, dwarfism)

    • Glutaric aciduria type I

    • Crigler–Najjar syndrome

  • These conditions are monitored through special Amish-specific genetic clinics, especially in Pennsylvania and Ohio.

🔸 3. Do Amish Marry Non-Amish?

  • Generally, Amish do not marry outsiders ("English" in their terminology).

  • For an outsider to marry an Amish person, they would need to:

    • Convert to the Amish faith

    • Join the Amish church

    • Fully adopt the lifestyle, which is difficult and rare

  • Conversion happens, but it's uncommon—only a small percentage of outsiders successfully join.

🔸 4. Is There a Problem with Incest?

  • There is no widespread evidence or data suggesting that incest (as defined by sexual relations between close kin, like siblings or parents) is a systemic issue among the Amish.

  • As in any community, isolated abuse cases can occur, but the Amish are known to handle issues internally, which sometimes results in underreporting.

  • Sociological critiques have been raised about accountability and justice in some cases, especially related to abuse within tight-knit, insular communities.

🔸 Summary:

TopicAmish Practice/Pattern
InbreedingElevated due to limited founders; not extreme
Cousin MarriageOften allowed; first cousins less common
IncestStrongly taboo; no data suggesting it's common
Marrying outsidersVery rare; outsider must convert and be baptized
Genetic effectsHigher rates of certain recessive disorders


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