Ecco perché col passare degli anni si fa più fatica a dimagrire: le cellule della massa grassa, gli adipociti, diventano più lente, o in altri termini il ricambio del grasso (ovvero il ciclo di rimozione e accumulo di grasso al loro interno) diviene via via meno rapido, indipendentemente da altri fattori quali l'alimentazione.
Lo rivela uno studio pubblicato sulla rivista Nature Medicine secondo cui, quindi, con l'avanzare degli anni può diventare essenziale incrementare l'attività fisica, perché si fa più fatica a controllare il peso. Lo studio è stato condotto tra Istituto Karolinska di Stoccolma e Università di Uppsala e Lione.
Gli esperti hanno osservato nell'arco di 13 anni il turnover del grasso nel tessuto adiposo di 54 individui di entrambi i sessi e visto che questa cala al trascorrere del tempo per tutti, predisponendo quindi all'aumento di peso o comunque rendendo più difficile perdere chili di troppo.
ats/joe.p.
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