FN1 and idiopathic pulmonary fibrosis: The described beneficial effect of a diet rich in cholecalciferol on the expression level of EMT markers is consistent with the observations of other scientists who, in a murine model of bleomycin-induced IPF, showed that the administration of cholecalciferol reduced the expression of Acta2/α-SMA [33,63], a similar effect was noted after the administration of calcitriol [36], and paricalcitol (synthetic analogue of vitamin D3), which additionally reduced the expression of Fn1/Fibronectin [64].