Interesting. Black tea has another plus point for treating diabetes. It seems the researchers at Tianjin Key Laboratory in China found the polysaccharides (a kind of carbohydrate) in black tea helps inhibit the absorbtion of glucose. They also studied the other teas, green tea, oolong tea. All three have polysaccharides but the black tea inhibition ability is the best.
So drink up more black teas! And yes the tea varieties in Cameron Highlands are of course black tea.