Smettere di fumare fa ingrassare? E’ vero ed è colpa dei batteri intestinali

dieta e fumo

Non smetto di fumare perché potrei ingrassare oppure fumare mi mantiene in linea. Ecco qui due tra le scuse più banali e inflazionate del dipendente da nicotina, che non smette di fumare solo esclusivamente perché non riesce a fare a meno di una sostanza che ormai gli è entrata nel sangue. Una cosa è vera: spesso gli ex fumatori tendono a mettere un paio di chili, subito dopo aver rinunciato alle bionde. Come mai? È la privazione dalle sigarette che causa un aumento di massa grassa o c’è un’altra risposta?

Sebbene la tendenza è quella di credere che per smettere di fumare, le persone impegnino il loro tempo mangiando o comunque assumendo più calorie, la  ragione è un’altra. Sentitevi quindi un po’ meno colpevoli e fate comunque attenzione alla vostra dieta, sempre. Hanno cercato di rispondere al quesito gli esperti dalla Swiss National Science Foundation, che grazie alla Zurich University, hanno pubblicato lo studio sul PLoS ONE.

Dopo lo stop alle sigarette dopo per una serie di ragioni proliferano nell’intestino gli stessi ceppi batterici delle persone obese. Per giungere a questa tesi, i ricercatori hanno analizzato il materiale genetico dei batteri intestinali presenti nei campioni di feci di una ventina di persone diverse per un periodo di nove settimane. Il campione era così organizzato: 5 volontari non fumavano, 5 erano fumatori mentre 10 avevano smesso da una settimana (dopo l’inizio dello studio).

Seppur quindi un test numericamente limitato, prendeva in considerazione tutte le situazioni. Il risultato? Le feci di fumatori e non fumatori sono abbastanza simili, comunque non sono state registrate modificazioni evidenti. La grossa differenza era tra i fumatori e coloro che avevano smesso di fumare. Le frazioni Proteobacteria e Bacteroidetes erano aumentate a scapito dei rappresentanti dei Firmicutes e degli Actinobacteria. Non è tutto, mantenendo invariata l’alimentazione (senza introduzione di più calorie), chi aveva smesso di fumare è ingrassato mediamente di 2,2 chili.

[Fonte]

Photo Credit | ThinkStock

 

 

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