Stevia Remedies
Aug 8, 2011 | By Lila Roe
Lila Roe has been a freelance writer since 2009. She writes for LIVESTRONG.COM, specializing in health and fitness topics, and has also ghostwritten health content for private clients. Roe holds a Bachelor of Arts in political science from Rutgers University, as well as personal trainer certification from the American Council on Exercise.
Japanese food manufacturers starting using stevia extract as a sugar substitute in the 1970's. In recent years, it has made its way into numerous products in the United States. Mainly thought of as a food, limited research suggests it might possess medicinal value, but a lack of in-depth study makes it difficult to firmly establish whether stevia can treat certain medical conditions. Talk to your doctor about the potential benefits and drawbacks of stevia supplements.
High Blood Pressure
A study at Taipei Medical University in Taiwan, published in the September 2000 issue of the ''British Journal of Pharmacology'' tested the effects of stevia against placebo in a total of 106 participants. For three months, individuals in the treatment group took 250 mg of stevia three times a day. At the end of the study, researchers observed a significant drop in diastolic and systolic blood pressure, compared to the placebo group. Monthly follow-ups found the effects lasted for one year after the study ended.
Another study conducted by the same team of researchers and published in the November 2003 issue of ''Clinical Therapeutics' again tested the effects of stevia on hypertension, but for a period of two years at twice the dose of the previous study -- 500 mg three times a day. Individuals in the treatment group experienced a 6 to 7 percent reduction in their blood pressure that began within seven days of starting the supplement and lasted the duration of the study.
While these results sound promising, the Beth Israel Deaconess Medical Center reports that no one in the placebo groups in either study experienced an improvement. Researchers consider this uncommon and it casts doubts on the validity of the studies. It also notes other studies found stevia did not have any effect on blood pressure, but notes that they used lower doses than the ones used in the Taiwanese studies and this could account for the lack of effect.
Another study conducted by the same team of researchers and published in the November 2003 issue of ''Clinical Therapeutics' again tested the effects of stevia on hypertension, but for a period of two years at twice the dose of the previous study -- 500 mg three times a day. Individuals in the treatment group experienced a 6 to 7 percent reduction in their blood pressure that began within seven days of starting the supplement and lasted the duration of the study.
While these results sound promising, the Beth Israel Deaconess Medical Center reports that no one in the placebo groups in either study experienced an improvement. Researchers consider this uncommon and it casts doubts on the validity of the studies. It also notes other studies found stevia did not have any effect on blood pressure, but notes that they used lower doses than the ones used in the Taiwanese studies and this could account for the lack of effect.
Diabetes
Stevia has also been touted as a treatment for diabetes, but very limited research exists on the use of stevia for this purpose. An older human study, published in the ''Brazilian Journal of Medical and Biological Research'' in 1986 tested the effects of 5 g of liquid stevia leaf extract on blood sugar levels in 16 nondiabetic adults. Six other healthy adults served as a control. Researchers found that consuming stevia extract improved glucose tolerance, or the rate at which your body can move glucose out of the bloodstream and into the cells for energy. They noted it ''significantly'' lowered glucose levels.
Researchers at the Taipei Medical University tested the effects of stevia on diabetic rats and published their results in the February 2005 issue of ''Planta Medica.'' The rats using stevia experienced a drop in blood sugar levels, and the researchers found it worked in two different ways. It not only led to an increase in insulin production but also helped the body use insulin more efficiently.
Researchers at the Taipei Medical University tested the effects of stevia on diabetic rats and published their results in the February 2005 issue of ''Planta Medica.'' The rats using stevia experienced a drop in blood sugar levels, and the researchers found it worked in two different ways. It not only led to an increase in insulin production but also helped the body use insulin more efficiently.
Combining Stevia with Diabetes and Hypertension Medications
If stevia actually does work to reduce hypertension and elevated glucose levels, you must exercise caution when combining it with medications used to manage these conditions. Using supplements that produce similar effects as drugs often means you need smaller doses of the medicines to compensate for the actions of the natural substance. Failure to make these changes, if necessary, can lead to low blood sugar and low blood pressure. Only your doctor can make this determination; do not alter your treatment plan on your own.
Other Considerations for Use
Beth Israel notes that research and the long history of use in Japan suggest stevia does not pose any major health risks, but the full effects of taking it in large quantities for medicinal purposes remains unclear. Stevia was used in the past as a means of preventing pregnancy, but the medical center notes the majority of animal studies found it does not affect fertility. Not all studies reached this conclusion, however, so keep that in mind if you have plans to conceive.
Read more: http://www.livestrong.com/article/510754-stevia-remedies/#ixzz1i7sWspUK
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