Whilst no differences were observed between CON group and CF at BL (BL: 0·41 (sd 0·19) g·kg–1, CON: 0·42 (sd 0·21) g·kg–1, P = 0·81, d = 0·05), Fig. 2), protein intake at lunch significantly reduced at FUP in CF participants compared to both CON and CF at BL (FUP: 0·29 (sd 0·12) g·kg–1, both P < 0·05, d > 0·76, Fig. 2). This evidence concerns the gene CFTR and cystic fibrosis.