my friend has CF and thinks she's fat...typical teenager, shes doing good for a person with CF, weighing around 160 she wants to go on a weight loss program, even though I said she shouldn't because she has CF. i want her to be healthy, but i want her to be happy too. what should i tell her to do if she wants to lose fat the safe way and get in shape? because having CF really won't let her run because it's bad for the lungs. any advice would really be appreciated. thank you