Fresh leaves

This form is the herb in its most natural, unrefined state. It is possible to grow a stevia plant in your house or backyard (see the resources section for companies that sell stevia cuttings). Just one word of caution. If you own a cat, you may not have too many stevia leaves left on the plant. They love to chew on it. For many centuries the Guarani Indians in South America used the leaves of stevia to sweeten their drinks. A leaf picked from a stevia plant and chewed will impart an extremely sweet taste sensation reminiscent of licorice that lasts for quite a while. In Bertoni's first official description of the stevia plant, he noted that "A fragment of the leaf suffices to keep the mouth sweet for an hour."

Dried Leaves

You can find the whole dried leaf of stevia sweetener in health food stores. A dried leaf is considerably sweeter than a fresh one, and is the form of stevia used in brewing herbal tea. When added to herbal tea blends, amounts can be adjusted to provide more or less of a sweet taste. Finely powdered or pulverized stevia leaf can be found both in bulk form and in tea bags. Several companies add stevia in tea bags with other herbs but do not mention that the stevia is for sweetening purposes since they are not allowed by the FDA to do so. These companies will instead call the stevia a dietary supplement. Most of these products are currently found in health foods stores. 
   Stevia leaves have a greenish color and can be used as flavor enhancers or sweeteners in a wide variety of foods and beverages such as vegetables, coffee, applesauce, and hot cereals.
   If you are interested in extracting the sweetening agents from the leaves, bring two cups of purified water to a boil. Reduce the heat to medium and add one half ounce of crushed or powdered dried stevia leaves. Cover and boil for three minutes. Remove the covered pot from the heat and steep the herb until cool. Strain the water through a cheese cloth and refrigerate it in a covered container. The resulting liquid concentrate should be greenish black in color.
   As a rule, about 10 percent of the leaves contain stevioside and rebaudioside, the actual sweet glycosides of stevia. Although stevia leaves contain various vitamins, minerals, and phytochemicals, the amounts consumed are generally so minimal that the nutritional value will be negligible.

   Generally two to four leaves are sufficient to sweeten a cup of tea or coffee. For stevia to have a more practical application as a tea or sweetener, the leaves must be dried or put through an extraction process, which makes the sweet taste even more potent.

White stevia extract

This is the form most commonly used in Japan, and generally contains 85 to 95 percent of the sweet glycosides. In this form, it is close to 300 times sweeter than sugar. A teaspoon of this extract has sweetening power equivalent to 2 to 4 cups of sugar. The sugar-type stevia packets found in many Japanese restaurants are bulked up with another substance (such as maltodextrin) since a much smaller amount of the extract itself is needed. One company in the US has also started marketing stevia in small packets, similarly adding maltodextrin. Could stevia ever become so popular in the US that practically every restaurant in the country would offer packets of this sweetener alongside the pink packets of Sweet' N Low and blue packets of Equal?

   There are hundreds of patents for stevia extraction processes existing around the world. Japan, itself, has over 150. Canadian researchers are hard at work to make a pure extraction process that they hope may completely eliminate the aftertaste. The type of extraction would influence the concentration of the various sweet glycosides, such as stevioside and rebaudioside, and could therefore influence its aftertaste. Thus, not all stevia powders are the same.

   Since extracted white stevia powder is so intensely sweet, we recommend that it be mixed with water and the solution used by the drop. You can dissolve 1 teaspoon of the powder with 3 tablespoons of filtered or sterile water. Once mixed, this solution should be stored in the refrigerator.

Stevia Liquid concentrates
These come in two distinctly different forms. One is a black, syrupy concentrate and the other is clear.
The black, syrup-like concentrate is made by boiling the dried leaves in water. Traditionally, the Guarani Indians thought this crude liquid had medicinal benefits. It has a delicious taste that adds to the flavor of many foods, particularly hot beverages. A dropper-style bottle is the most common way that this form of stevia is found in stores. The clear type of liquid concentrate is made by mixing a large amount of the white powder in distilled water or grain alcohol. Some of these liquid preparations contain other ingredients such as chrysanthemum flowers. It can be added to cocoa powder.

Natural sweetener for diabetes

The availability of artificial sweeteners has been of enormous benefit to diabetics. However, there's always been a concern that over consumption of these synthetic sweeteners may cause some unknown harm to the body. Could stevia substitution be a good alternative in diabetics? We believe so. Stevia leaves have been used as herbal teas by diabetic patients in Asian countries. No side effects have been observed in these patients after many years of continued consumption (Suttajit, 1993). Furthermore, studies have shown that stevia sweetener can actually improve blood sugar levels.

   In 1986, Brazilian researchers from the Universities of Maringa and Sao Paolo evaluated the role of stevia in blood sugar (Curi, 1986). Sixteen healthy volunteers were given extracts of 5 grams of stevia leaves every six hours for three days. The extracts from the leaves were prepared by immersing them in boiling water for 20 minutes. A glucose tolerance test (GTT) was performed before and after the administration of the extract and the results were compared to another group who did not receive the stevia extracts. During a GTT, patients are given a glass of water with glucose and their blood sugar levels are evaluated over the next few hours. Those who have a predisposition to diabetes will have a marked rise in blood sugar levels.
   The volunteers on stevia sweetener were found to have significantly lower blood sugar levels after ingestion. This is a positive indication that stevia can potentially be beneficial to diabetics who substitute it in order to decrease their sugar consumption. Even if stevia by itself is not able to lower blood sugar levels, just the fact that a diabetic would consume less sugar is of significant importance in maintaining better blood sugar control.

   If you're diabetic, chances are you consume a large amount of artificial sweeteners and you may be concerned about switching to stevia since long-term human studies have not been done with this herb. You may also be accustomed in your use of these artificial sweeteners and would not be willing to completely stop them. One option is to gradually use less of them while substituting stevia. For instance, you can initially use stevia in some of your drinks, like coffee or tea. After a few weeks, if your comfort level with stevia increases, you can gradually use more of the herbal extract. Over the next few weeks and months you can either switch completely to stevia, or you can continue using it in combination with artificial sweeteners. With time more research will become available on the safety of stevia and artificial sweeteners. Based on the results of these studies, you can determine which ones to continue using in a larger amount.

   It's also quite possible that artificial sweeteners may be safe in low amounts, but problems could arise when they are used in excessive quantities. By partially or mostly substituting stevia, you can reduce any potential risk.

Sweet Teeth with No Cavities

Even a five-year old child knows that sugar causes tooth cavities. There are certain bacteria in our mouths, particularly streptococci mutans, that ferment various sugars to produce acids. These in turn eat through the enamel of the tooth causing pockets or cavities. For a long time, scientists have searched to find alternative sweeteners that are not fermentable by bacteria and hence do not cause cavities. Artificial sweeteners have been helpful in this regard.

Natural Stevia Sweetener in Children

Candies, sodas, ice cream, pies, cakes... it's disturbing how many sweet products are ingested by children on a daily basis. All that sugar can lead to tooth cavities and obesity. We believe that partially substituting with stevia can help children satisfy their sweet tooth while decreasing the risks from excessive sugar intake.

   If you're a parent, you can take advantage of the many recipes provided in the second half of this book to provide your children with tasty sweets that will satisfy their sweet teeth but not cause damage to the teeth. Obesity in children is a growing problem in this country and any method we have of helping children reduce their caloric intake will be greatly beneficial.

   We also are concerned with children overconsuming excessive amounts of artificial sweeteners. The potential, long-term health consequences of saccharin and aspartame ingestion are currently not fully known, but they do need to be kept in mind. Eliminating all artificial sweeteners will be a frustrating enterprise since they are extremely prevalent. However, by partially substituting stevia in homemade desserts, you can significantly reduce your children's exposure to these artificial chemicals.

   Hopefully, with time, stevia can be added to a variety of sodas, candies, gums, and other foods in the US, just like it currently is in Japan and other countries.