Last New Year's Eve, I came down with the horrible cold/flu/whatever that was going around. A lot of people ended up with pneumonia from it, including one of the Ministers from the United Church, who was out of it in the hospital for quite a while.I usually catch every virus that goes around. Really badly, too.
I ate nothing but organic oranges and organic raisins for a week, and most of the thing was gone. Unfortunately, I'd eaten my whole grocery budget for the month, and was living on canned food, which gave me some more congestion until I could get fresh food again. And I had lingering tiredness for three months more. But I didn't get pneumonia!!!
Organic oranges have up to 66% more vitamin C than sprayed oranges. You can also eat the peel, because it's sweeter due to the lack of poisons in it. (I'm also allergic to the chemicals used in pesticides/herbicides/etc. so I can really tell the difference when I eat organic food.)
I often get migraines during cold season from the medications other people are using, especially the menthol types. (I'm allergic to that, too.)