STIMULATING BEVERAGES

NATURE OF STIMULATING BEVERAGES

12. STIMULATING BEVERAGES are those which contain a drug that stimulates the nervous and the circulatory system; that is, one that acts on the nerves and the circulation in such a way as to make them active and alert. Common examples of these beverages are coffee, tea, and cocoa or chocolate. If the nerves are in need of rest, it is dangerous to stimulate them with such beverages, for, as the nervous system indirectly affects all the organs of the body, the effects of this stimulation are far-reaching. The immediate effect of the stimulant in these beverages is to keep the drinker awake, thus causing sleeplessness, or temporary insomnia. If tea and coffee are used habitually and excessively, headaches, dull brains, and many nervous troubles are liable to result.

13. The stimulant that is found in the leaves of tea is known as theine; that found in coffee beans, caffeine; and that found in cacao beans, from which cocoa and chocolate are made, theobromine. Each of these stimulants is extracted by the hot liquid that is always used to make the beverage. It is taken up by the liquid so quickly that the method used to prepare the beverage makes little difference as to the amount obtained. In other words, tea made by pouring water through the leaves will contain nearly as much of the stimulant as tea made by boiling the leaves.

14. In addition to the stimulant, tea and coffee contain tannin, or tannic acid, an acid that is also obtained from the bark of certain trees and used in the tanning of animal hides in the preparation of leather. Tannin is not taken so quickly from tea and coffee by the hot liquid used in preparing the beverage as is the stimulant, so that the longer tea leaves and coffee grounds remain in the liquid, the more tannic acid will be drawn out. This fact can be detected by the bitter flavor and the puckery feeling in the mouth after drinking tea that has been allowed to remain on the leaves or coffee that has stood for some time on the grounds. Tannic acid has a decidedly bad effect on the digestion in the stomach, so that if improperly prepared tea or coffee is indulged in habitually, it may cause stomach disorders.

TABLE I
STIMULANT AND TANNIC ACID PRESENT IN STIMULATING BEVERAGES

BeverageStimulantQuantity of
Stimulant
Grains		Quantity of
Tannic Acid
Grains
CoffeeCaffeine2 to 31 to 2
TeaTheine1 to 21 to 4
Cocoa or chocolateTheobromine1 to 1-1/21/2 to 1

15. The quantity of stimulant and tannic acid contained in an ordinary cup of tea, coffee, and cocoa or chocolate is given in Table I. As this table shows, the quantity, which is given in grains, does not vary considerably in the different beverages and is not present in such quantity as to be harmful, unless these beverages are indulged in to excess.

To reduce the quantity of caffeine contained in coffee has been the aim of many coffee producers. As a result, there are on the market a number of brands of coffee that have been put through a process that removes practically all the caffeine. The beverage made from coffee so treated is less harmful than that made from ordinary coffee, and so far as the flavor is concerned this loss of caffeine does not change it.

16. Neither tea nor coffee possesses any food value. Unless sugar or cream is added, these beverages contain nothing except water, flavor, stimulant, and tannic acid. Chocolate and cocoa, however, are rich in fat, and as they are usually made with milk and sugar they have the advantage of conveying food to the system. Because of their nature, tea and coffee should never be given to children. Cocoa and chocolate provide enough food value to warrant their use in the diet of young persons, but they should not be taken in too great quantity because of the large amount of fat they contain. Any of these beverages used in excessive amounts produces the same effect as a mild drug habit. Consequently, when a person feels that it is impossible to get along without tea or coffee, it is time to stop the use of that beverage.