In Reply.—Lober reported data on 60 persons with cystic fibrosis (CF) over 20 years of age, while our population of 63 individuals contained only three who were over 15 years old. The median age of death in patients with CF is 12 years. It is not realistic to compare patients who have survived to adulthood with a younger group. He did not state the type of nutritional supplementation that was of no significance among his patients. Our experience with nutritional supplements other than the amino acid-glucose polymer mixture has been equally poor.
The diet of predigested nutrients was given to patients in our clinic whose clinical condition was severe and for whom the prognosis in terms of survival to age 20 was not good. Our data on growth rates were similar to those of Lober in that both heights and weights were skewed toward the lower end, and height