There is certainly some placebo effects going on. Some people LOVE playing up when they're ill so they can be babies.
I recently started getting my vitamin levels up. I was deficient in vitamin D a few months back. So far I have a sore throat, but my other roommates got wiped out pretty fast. I'll see how it goes in the next few days, but maybe making sure your blood levels are in a healthy range has a lot to do with it too. My doctor told me majority of people are vitamin D deficient.
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