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Anecdotally I haven't had a cold in years. I work out 4 days a week and while I wouldn't call it a strict diet I have an upper limit calorie "budget" that I never exceed. While it's certainly possible that masks helped some people avoid all airborne transmissions last year, lots of people were also able to exercise more and make better food choices without the rush of breakfast and lunch commutes.

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I made absolutely no changes 1 year, but because my workspace at work was in an alcove next to an air conditioning vent that pulled air from the outside, I completely dodged the office cold because I basically had my own positive pressure environment.

It's more likely your lifestyle is simply keeping you away from people and places that experience high levels of foot traffic.

I also wonder if some people just don't have as strong as immune response and so they get barely a sniffle from a typical cold virus.

Get kids. They are plague carriers.

My dad used to refer to day care as "your friendly local disease exchange," because he and my mom would get sick whenever they visited grandchildren.

And a former colleague, then childless, called them "petrie dishes."

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