This section is from the book "The Relation Of Food To Health And Premature Death", by Geo. H. Townsend, Felix J. Levy, Geo. Clinton Crandall. Also available from Amazon: Clean Food: A Seasonal Guide to Eating Close to the Source with More Than 200 Recipes for a Healthy and Sustainable You.
"The pineapple is one of the most delicious of all tropical fruits. It contains all of the fruit acids and some other substance very similar to papain, which is a digestive agent for all kinds of food. There is probably no other fruit generally known that has the same property for digesting other foods as that of the pineapple."
"That is very questionable. The pineapple contains an extraordinary amount of tough fiber, which is exceedingly difficult to digest
"Well, the juice should be obtained in some way from the pineapple without the tough fibre, macerated in water and expressed by compression. It is now prescribed to considerable extent in certain diseases of the stomach. Zumo-Anana is a pineapple wine, beneficial when there is insufficient secretion of digestive juices, but contra-indicated where there is excessive secretioa
"The lime is probably the sourest fruit known. Citric acid is manufactured from it. Also, lime juice. It is very similar to the lemon. Citric acid is often used as a substitute for lemons.
"The grape fruit is a large fruit, much larger than either orange or the lemon. It contains similar properties to the lime and lemon with some bitter matter. It is not extensively used, but makes a cool and refreshing drink, and a few people like the fruit."
 
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