At the American Diabetes Association's convention, researchers shared data on the most popular herbs used by diabetics, warning that little or no research has been done to prove alternative remedies work, or to understand potential harmful side effects.

Some examples. The spice fenugreek, often used to flavor maple syrup, decreases blood sugar levels by slowing the absorption of glucose. But it can also induce labor, cause digestive problems, and interfere with anti-platelet agents and cause bleeding.

The dried fruit powder or juice of bitter melon is said to lower blood glucose levels after eating, but it also can induce labor, cause a diabetic coma in children, or infertility problems in women.

Gymnema sylvestre can block the absorption of blood sugars in the digestive tract and block sweet tastes and lessen cravings. But it can also cause extremely low blood sugar levels and abdominal problems.

There are a number of botanical supplements that are marketed throughout the world as helpful for diabetes, but very little data is available on these in terms of scientific clinical trials.

The best advice, say the health experts, if you plan to try an alternative treatment for diabetes, be sure to talk with your doctor first.