CFTR and cystic fibrosis: Given the often substantial changes in their bodies that PWCF may have recently experienced with the ongoing use of CFTR modulators, CF care team nutritional guide- lines are evolving; instead of an emphasis on quantitative BMI cut offs, recommendations are being tailored to promote optimal nutritional health to maintain weight and consume, for example, a fiber-rich diet with lean protein in order to prevent chronic conditions associated with aging such as heart disease [11].