Could it be a wake up call?

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Colds are so prevalent this time of year. I wonder if they aren't a sort of wake up call of sorts. By that I mean that we need to look at our diet and see if we are getting foods in it that have zinc and Vitamin C in them. Why because those strengthen the immune system. Onions, and citrus fruits for vitamin C. And, here is a list of foods with zinc in them: Pumpkin seeds, oysters, cashews, mushrooms, wheat, lentils, chickpeas, wild rice, sunflower seeds, beef, maple syrup, mung beans, pecans, crab, peanuts, walnuts, barley, cocoa bean, bratwurst, almonds, cheese and masa. And we need to be sure we are washing our hands after we use the restroom and airing out the house once in awhile. I know that I let the house get closed up and I am into keeping it warm and I don't air out. The old germs seem to linger. What are your thoughts on this one?