For me, I called Bingo for quite a few years and found myself coughing if I ate certain foods prior to calling ... Hot dogs, chocolate, dairy products to name a few.
So for those of you who love cold calling on the phone, do you watch what you eat and drink before starting? Do you find other foods/drinks that interfere with your voice quality when talking to prospects?
Edit: Thanks to the comments below, I should also include what you drink here.