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And old folks often have very poor diets. That may be why a simple cold can put them in the grave. Interesting thing: Back in the height of the industrial revolution, when many inner-city kids were getting rickets for lack of sunshine, doctors found they did not die from broken bones. They died from pneumonia.
There is a strong correlation between good diet and health. That connection may include getting enough zinc and getting enough quercetin from vegetables for the zinc to get into your cells.
Vitamin C increase iron absorption. So cooking spaghetti sauce with fresh tomatoes in a cast iron skillet is an ideal practice.