Has anyone else heard this from their GP? My GP suggested I stop drinking fizzy drinks as he thinks the chemicals used to carbonate drinks can cause wheezing. He did say it was from personal experience and he did a controlled exclusion diet to work out why his own asthma had become so bad. He recons it is the fizzy drinks. I will give up fizzy drinks (despite really liking them) but wondered if anyone has heard anything about it. In the meantime, I am dosed up again on antibiotics with a bad chest infection. If this weather doesn't improve soon, I think I might emigrate to a desert.