Nothing is worse than getting sick. We're busy people, we have stuff to do, and getting sick can derail even the most focused among us.

Upset stomach, wheezing, sneezing, indigestion - it all leaves us feeling miserable. But we all have that one friend that constantly dodges being sick, right? This is how they do it.

1. They don't take vitamin C supplements.

"Wait a second, doesn't vitamin C help your immune system?" Of course it does! But people who never get sick don't pop vitamin C supplements or, even more uselessly, drink those fizzy powders you find in checkout lines.

Instead, they get their vitamin C from whole food sources, like fruits and vegetables. Bell peppers, leafy greens, kiwi, citrus fruits, and broccoli are all great sources.

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