I also have chronic sinus infection with my CF. However, I dry fast on thursdays, and fridays my sinuses are always their least infected. I have gotten over yeast, bladder, tooth and lung infections with just 24 dry fast. But I haven't been able to completely get over my 2 year sinus infection. But you shouldn't dry fast unless you have been on raw food diet for at least a couple months. I knew I was ready to dry fast when I no longer was ever hungry or thirsty. Dry fasting kills infection because it dehydrates bacteria and viruses. (It also makes your body eat up wrinkles and damaged tissues). Anti-aging all the way!