I believe it is important in 2020 to get some out-of-print "do-it-yourself" health books back into circulation for the modern times when we expect physicians to cure everything with a pill, an injection, or an operation. Some modern medications may cure one ailment but cause something worse. That is why I am republishing parts of books from the past that helped maintain our health when more studies were being done on humans brave enough to try different foods, lifestyles, and exercise rather than current pharmaceutical labs that only work at the molecular level with pills. Don't get me wrong, the cure for polio, measles, suppression of HIV/AIDS, syphilis, bubonic plague and other scourges of the past have been laid to rest by medical science. However Covid 19 (or coronavirus) is a new and deadly health disorder that has crept in and which doesn't seem to respond to previous treatments for viruses, some bacteria, germs, microbes, and other pathogens that are more common. Yet you can still easily and cheaply improve your PH balance which will help keep your natural immunity to fight off most of these pathogens. All you need to do us make intelligent food choices full of vitamins and minerals which improve your health instead of unhealthy food/beverage selections that degrade your body chemistry and allow pathogens to easily enter and destroy your health and possibly your life..