Black Tea

• Studies have shown that black tea has the ability to keep blood sugar levels steady, preventing spikes. Studies conducted in England have found that 1 gram of black tea (about one cup of brewed tea) will reduce blood sugar levels and prevent highs and lows through the day. On top of blood sugar reduction, black tea is also known for its cancer-fighting properties, as well as reducing the risk of Alzheimer's disease. Do not add milk to any kind of tea, as studies show milk will destroy the blood sugar-reducing properties, making the tea useless in stabilizing blood sugar levels.
  
  

Green Tea

• The antioxidant EGCG (epigallocatechin gallate) is known to enhance insulin levels, which causes a reaction that will reduce blood sugar levels. EGCG is most commonly found in green tea. Drinking green tea throughout the day will stabilize blood sugar levels, preventing highs and lows that sometimes occur among diabetics.
  
  

Oolong Tea

• A study in Taiwan found that oolong tea reduces blood sugar levels. In the study, participants drank one-and-a-half quarts of oolong tea per day. Oolong tea also contains EGCG, which increases insulin production in the body. Any of these teas can be consumed warm or cool, the temperature of the tea does not make a difference.