Depending on his past eating habits you may have to experiement for a while. Good nutrition is the hands-down the most important thing we all can do, but especially in special needs kids like those with autism and CF. In fact, there are some similarities in the autist and CF bodies in terms of some nutritional needs (tendency toward high acidity, digestive difficulties, in some trouble with dariy and wheat gluten as an irritant to the gut). Both seem to benefit from a probiotic (acidophilus like Culterelle) and even some supplements like GSH.
Many clinics will tell you just get calories in them in whatever way you can, fat, twinkies, french fries, whatever they want just add the calories. I think this is hog wash and the worst thing one could do. There are lots of creative ways to add calories that don't require tons of dairy or saturated, omega 6 fats. Here's some of our tricks:
Smoothies: buy the best blender you can we love Vitamix. You can make all kinds of smoothies. Here are 2 favorites: banana/strwberry/orange (1-2 bananas, cup or so frozen berries, 1-2 orange juice, protein poweder [soy, egg white powder, rice protein we aim for 8-12 grams], flax seed powder, and even a little walnut/canola/olive oil. Blend and enjoy. You can also add greens in a powder form and they won't even know it.
Chocolate peanut butter shakes (3 scoops chocolate ice cream[soy or rice dream as alternatives to milk] 3 heaping scoops of peanut or other nut butter and milk [rice or soy alternative]. Blend and enjoy
Also we make sure each meal has a good amount of protein. I hard boil lots of eggs to have as snacks and make dips using mayo and sour cream (soy version is possible). I focus on snacks as a way to get lots of extra calories. We buy Clif bars (power bar) and make sure he eats yogurt/cheese/lunch meat at every snack in addition to lots of fruits and as many veggies as you can. Dips seem to help the veggie thing.
Other than that he eats what I make for the family and this seems to be working well. I only cook with olive, canola, walnut and add flax where I can. These are the oils rich in Omega 3 which is helpful in keeping the body in an anit-inflammatory state. Too much fat from sources rich in saturated fat and omega 6 increase inflammation and a generally less healthy for all of us.
We also make sure he gets good vitamins and supplements to support him further.
I love nutrition and hope this helps. He is older and will have to be a part of the choices so make it fun and maybe he will be open to adding calories in different ways then he is use to. Good luck and let us know how things go as you get settled in.
Your already doing a great job!
Warmly,
Jody
jody@meta4tech.com