Scientists at the University of Greenwich have found two Asian plants they think might not only be a treatment for diabetes, but also have lipid/fat lowering properties and therefore treat obesity.
They are trying to isolate compounds from Cassia auriculata and Cassia alata, one of these compounds has been found to be 8 times more effective than a standard anti-diabetic drug (acarbose)
Even the crude plant extract has potential to be used clinically.
Traditional medical uses in various forms of Cassia auriculata also known as Senna auriculata include fevers, diabetes, conjunctivitis and rheumatism.
Cassia alata also known as Senna alata or candle bush is traditionally used externally for ringworm due to its fungicidal properties, but also as a laxative according to Wikipedia.
See the Science Daily article here:
Drugs for diabetes? Scientists test the power of plants