There's a good chance his enzyme or maybe dosing needs to be increased. I increased my enzyme intake over 20 years or so and now am way over the recommended dose limit, but it works for me. Any less and I have problems. He should talk to his doc or a GI specialist about it. Were his surgeries more GI based? Sounds like his lungs are pretty healthy.
We do have stinky farts, but I believe foods can also play a role. I actually stopped eating mammals about 12 years ago, then cut out poultry 10 years ago. I notice when I'm in the shared office bathroom I'll hear some "normal" dudes sitting on the bowel making all kinds of explosive gaseous noises. I don't usually have that issue often, unusual given my enzyme needs. I think our bodies can digest foods easier than other foods, while calorie intake is important, I also think it's important to have a well-balanced diet even more-so than non-CF people. And beef and beef-jerky 3-times a day does not sound like something a GI system handles easily. He's probably not absorbing a large amount of the calories he takes in. He should be talking to his clinic dietician if he has one.
We do have stinky farts, but I believe foods can also play a role. I actually stopped eating mammals about 12 years ago, then cut out poultry 10 years ago. I notice when I'm in the shared office bathroom I'll hear some "normal" dudes sitting on the bowel making all kinds of explosive gaseous noises. I don't usually have that issue often, unusual given my enzyme needs. I think our bodies can digest foods easier than other foods, while calorie intake is important, I also think it's important to have a well-balanced diet even more-so than non-CF people. And beef and beef-jerky 3-times a day does not sound like something a GI system handles easily. He's probably not absorbing a large amount of the calories he takes in. He should be talking to his clinic dietician if he has one.