Many people with CF have problems when they eat food, making it hard for their intestines to absorb nutrients, especially fat. To help with this, enzymes are taken with meals and snacks. Vitamins A, D, E, & K are unique because they need fat in order to be absorbed by your body. They are called fat-soluble vitamins.
Even if you take enzymes regularly, you can still lose fat in your stool. If you are losing fat then you are probably also losing vitamins. If you don’t take your vitamins, over time, you may develop low levels in your blood. This is known as a vitamin deficiency.
Several minerals are particularly important for overall health in CF, including salt, calcium, iron, and zinc.