According to the International Diabetes foundation, By 2025, about 380 million people worldwide will be affected by Type 2 diabetes. It is suggested that some day, people who are at greater risk for diabetes may be told to consume more tea and coffee on a regular basis as well as exercising more often.
Researchers looking at 18 studies involving over 450,000 people between 1966 and 2009 have found the link between coffee and diabetes. The data was recently analyzed by Rachel Huxley and her colleagues from the George Institute for International Health in Sydney, Australia.
Huxley found that each cup of coffee that a person drank per day reduced the risk of diabetes by 7%. The researchers from the Archives of Internal Medicine concluded that those who drink three or four cups a day have a 25% lower risk than those who drank between zero and two cups per day. People who drink more than three cups of decaf coffee a day have around a 1/3rd lower risk of developing diabetes. Those who drink more than three to four cups of tea have a 1/5th lower risk than those who drink no tea.
The fact that these results were found in decaf beverages eliminates the possibility that caffeine is the cause. Researchers suggest that compounds in the drinks such as magnesium or antioxidants might be linked to the findings. Other research showed that caffeine may actually increase the risk of diabetes in obese people. More research must be made in order to take into account specific things like the effects on certain ethnic groups and whether tea drinkers are more health aware than coffee drinkers in general.