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>People who say they "never get sick" are often "sick" but don't know it.

Or maybe they don't have children.

First year of preschool was the worst, after that immune system workout, it got a lot easier.

Is it true that people who rarely show common-cold symptoms have weaker or under-active immune systems? Are the differences meaningful beyond just the common cold? In other words, is it true that chronically sick people are actually healthier in some sense?

> People who say they "never get sick" are often "sick" but don't know it.

Oh common. That's just pure bullshit.