Seems like the first question got answered so I'll leave that one. My husband takes in about 5500-6200 calories a day (yes you read that right <img src="i/expressions/face-icon-small-smile.gif" border="0">). His CF dietician thinks it's too much, she always has. But it's what keeps him at a healthy weight so neither of us really care what she says or thinks. He does better with his own diet that any of the recommendations she ever gives.
My aunt is also a dietician. Out of curiosity, she brought home a thing called a "med gem". It helps determine one's calorie needs. Basically, he needed to be calm and relaxed, no activitiy for 2 hours prior, no food for 2 hours prior. Then he breathed into this little hand held machine for about 1 minute. It gave him a number of something like 2800 k/cals. Then my aunt added on 40% of that for activities (Mark's a fairly active guy, the average add on range is 30-50% depending on activity level), and an additional 50% of the last result because of his CF... so in all about 5880 on a normal day for him where he goes to the gym.
He takes in about 3500 of that from food and the rest in shakes called Serious Mass and Boost Plus shakes.
Hope this helps....