Zusammenfassung
Die Ätiologie der Adipositas ist multifaktoriell. Bei Betroffenen tragen Umwelteinflüsse und mindestens ein, in der Regel aber mehrere bis hin zu vielen Genvarianten zu Entstehung und Verlauf der Störung bei. Adipositas kann mutmaßlich ohne genetische Veranlagung nicht entstehen; die entsprechenden Umweltbedingungen stellen ein sine qua non dar. Die genetische Prädisposition resultiert aus der Wirkung vieler Genvarianten eines Individuums auf Energiezufuhr, -aufnahme und -verbrauch. Hierbei haben einzelne Genvarianten einen nur kleinen, andere hingegen einen großen quantitativen Einfluss auf das Körpergewicht. Die Allele wirken sich auf Stoffwechsel ebenso wie Verhalten aus. Individuelle Unterschiede in Art und Anzahl der zu Übergewicht prädisponierenden Allele entscheiden mit darüber, wann, unter welchen Umweltbedingungen, über welche Mechanismen und in welchem Umfang Adipositas resultiert. Genetische Faktoren nehmen auch Einfluss auf Art und Schweregrad der Folgestörungen.
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Hirtz, R., Degenhardt, F., Hinney, A., Hebebrand, J. (2022). Genetik und Gen-Umwelt-Interaktionen. In: Wabitsch, M., Hebebrand, J., Kiess, W., Reinehr, T., Wiegand, S. (eds) Adipositas bei Kindern und Jugendlichen. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-59216-8_4
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