I am ddf508, born in 1971, Apgars of 10. I immediately went downhill after birth. By the time I was 3 months old, I'd had 3 cases of bronchitis or pneumonia had LOST 2 lbs from my birthweight of 6.5 lbs, been hospitalized almost constantly. They finally diagnosed me with CF. To give you and idea of how things have changed, the docs (and this was in BOSTON, not some podunk no-name place) told my parents there was no hope, gave them no advice on how to treat me, and sent me home to die. YEEHAW.
My parents found a different doc, in NYC, who immediately put my on enzymes and started me on nebbies and CPT 4x a day. I struggled with failure to thrive and lung infections constantly. At age of almost 10, I was 38 lbs and tiny. Did hyperalimentation in the PICU for 6 weeks at 10K calories a day, put on 20 lbs. That led to a turnaround in my health and I grew. Less lung infections, but the GI stuff was still pretty bad and painful. I was a runner as a child, rode horses every day too, tennis, swimming, hiking, you name it.
Fast-forward to early 20's. In college, I figured out that if I didnt eat fat, and stuck to fruits, veggies, lean meats, and fat-free dairy, my GI issues went away. Stopped taking enzymes, and started having no trouble keeping weight on. Now I'm amost 44, with a very healthy BMI. My lungs have deteriorated over time, but I have always remained super-active and was a professional athlete for years until my lungs got really bad. I am still very much PI, but as long as I dont eat fat, my weight is great. So it's weird, but its worked for me. (as an interesting aside, I went to Bermuda resort last week, pigged out and ate a lot of stuff I shouldnt have, and LOST 3 lbs over the 6 day period. When I got home, I went back to my fat-free regular diet and put the weight back on with no problem).