Good nutrition is central to CF care because it protects growth and lung function. Malabsorption from pancreatic insufficiency, extra calories burned from breathing and infection, and CF-related diabetes all make it hard to stay well-nourished. The classic CF plan is a high-calorie, high-fat diet paired with pancreatic enzyme replacement (PERT) at every meal, fat-soluble vitamin supplements (A, D, E, K), and extra salt (people with CF lose more sodium in sweat). A CF dietitian tailors the plan, monitors growth and weight, and adjusts it — including in the CFTR-modulator era, where some people now gain weight easily and the focus is shifting toward balanced, heart-healthy nutrition rather than calories at all costs.
Built and monitored by the CF care team’s registered dietitian. It combines PERT with meals, fat-soluble vitamins, salt, and — when weight or growth lag — oral supplements or, sometimes, tube (enteral) feeding. Blood levels of vitamins and screening for CF-related diabetes guide adjustments.
Nutrition care is lifelong and individualized. Well-managed nutrition supports growth in children, better lung function, and quality of life. Plans are reassessed regularly and change over time — especially on modulators, where the goal is increasingly balanced nutrition and healthy weight rather than maximum calories.