Common colds are caused by viruses, not deficiencies. I know many folks believe that extra vitamins will get rid of them, and indeed there seems to be solid evidence that ascorbic acid will help lessen and shorten the duration of colds. A fairly good faction of people believe ascorbic acid will prevent colds altogether, in fact. But the viruses are there, easy to see with powerful microscopes, and they're real. Yawns and sneezes, too, are natural phenomena in themselves and aren't caused by deficiencies. They're reflexes.

Good nutrition and avoidance of processed foods is great advice to prevent and shorten disease. But even people who eat the most pure, chemical-free, organic diets are afflicted with diseases periodically, including common colds and cancer. We're living organisms, and living organisms get sick.

People have been getting common colds and sneezing and yawning and scratching for as long as people have been on this earth, long before the advent of chemical-laden, processed foods.