This seems completely unbelievable to me. Totally outside of my personal, professional, and family experience.
My oldest starting preschool was one of the worst times in my life. We were sick from august to december, then january to may. Dreadful.
It got better. My youngest is 3 now and is ahead of where my oldest was due to having 2 older siblings importing illnesses for several years, and this year we finally were mostly not sick all school year. Which is to say, we were probably closer to the 15 days "materially sick" mark. I say materially sick to mean, definitely sick, though perhaps not taken out of school (due to not technically being outside of the health exclusion policy, and sometimes I only realize they were "materially" sick after they got home instead of just "passably sick given kids will basically have a lingering cough from august to may).
Result: not been sick more than a day or two for fifteen years. And rarely, once or twice a winter.
One exception, during covid I had it and it lasted five full days at medium intensity, then went away permanently.
This is not a “placebo effect” at all, was like turning on a light switch, immediate results. During the winter I heard about it, I’d been sick for almost three weeks straight, couldn’t shake it. Naysayers look silly in my opinion, or are perhaps an exception I mentioned above.
I raised vitamin D intake in winter, I take betaglucans and if I feel like I am starting to get under the weather I take 2-3g of vitamin C per day.
Since we started that, no colds or flus for me or my wife and we have a kindergarten kid.
I still was sick all the time. That combination of not enough sleep (kids crying in the night etc.), work stress and insane amount of viruses from nursery is killer.
Not well known but there are people who simply can not absorb D thru the gut. A high school friend is one. Shouldn’t discourage the 90%+ who can benefit because of exceptions.
I got sick so often it limited a lot my general life: I stopped practicing sports regularly and started being very careful with sleep(sleep deprivation likely increased the chance of infection), because I knew if I did not lead a perfectly balanced lifestyle I would get sick. I am quite upset I stopped running 15km per week, even with snow. I never fully went back to it, due to fear of getting sick, and having to take care of toddlers while being feverish or nauseated.
In those years I think I was not disease free more than 3 months at a time. In a year where many people decide to not have children, it does not help the cause of having children seeing other parents suffer so much, in those early years. I have non parent friends that get sick after meeting us, resenting meeting us and asking if we are sick, because they spent all the night in the bathroom or with fever. Fortunately it feels we are already immune because we are not sick very often anymore.
Does running long distance increase the chance of getting sick?
So if I am exhausted of a run and cannot rest or sleep, it is almost sure I get sick soon after. Just my experience.
When I stopped working in an office, I almost completely stopped getting sick.
I've had years in which most people in my immediate surroundings were sick for weeks or months (likely exacerbated by mold, school, and travel). Also years in which I never really got sick at all.
Getting sick that often is pretty debilitating.
I think so, too. The referenced article (https://www.thelancet.com/journals/lancet/article/PIIS0140-6...) says:
“Every year, in the USA, about 25 million people visit their family doctors with uncomplicated upper respiratory infections, and the common cold syndrome results in about 20 million days of absence from work and 22 million days of absence from school.”
That makes 44 million days of absence on a population of 340 million, or about one day for every 7½ citizens.
Even assuming healthy people are as susceptible to that as the general population and assuming 50% of those that get ill will work, anyways, out of financial necessity, that still is a far cry from “Healthy people spend roughly 15-25 days each year […] sick”
That paper also has a graph showing Mean annual incidence of respiratory illnesses by age group. Eyeballing it (ignoring size differences between age groups) I get at an average of about 3 infections. If each takes a week, that gets you to those 15-25 days.
We also had 10+ covids to indicate how much it changes, mostly imported by kids from creche (we hit the 'right' timing with them and covid waves). What do you expect when they shared pacifiers and put fingers in mouths all the time. Or suddenly sneezing gunk all over my face when holding them.
Before kids, I was usually sick 1x a year for few days, or had 1 proper flu week and that was it, my wife even less. No it didn't visibly improve our immunity, had covid last autumn and it felt almost like for the first time, sans loss of smell and taste.
Now that I'm isolated in my sterile home office and might go weeks without seeing someone outside of my family, I basically take no sick days.
A message reminding people that you can improve the resistance to basic colds/flu for a school teacher, tested on several school teachers, should be motivating for someone tired of being sick.
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