Well if it makes you feel better, for 3 years while I was on Atkins, I didn't catch one cold. However, I fell off the diet about a year ago and wanted to get back on it after the New Year. I'm currently suffering from my 3 cold. So, the diet has little to do with it. We're picking up viruses and this year in New England, because it's been so cold, we are staying indoors much more, thereby incubating and spreading these viruses.