In a study published in Diabetes Care, March 2005, scientists have reported that caffeine may cause insulin sensitivity in people.
Insulin sensitivity is the measure for the risk of heart disease. If a person is more insulin sensitive then he has a lower risk of heart problems.
Diabetes type 2 happens when body cannot use its own insulin to control blood sugar. As this happens the body becomes unable to produce enough insulin to overcome insulin resistance and keep up to the need of the body. Insulin resistance is also called decreased insulin sensitivity of the body.
The new study had tried to note if exercise training reduces the association between caffeine and insulin sensitivity. The study was done on lean and obese men with or without diabetes type 2. The subjects went through two hyperinsulinemic-euglycemic clamp procedures before and after a three-month exercise schedule.
The results showed that caffeine ingestion was associated with reduction in insulin sensitivity. This effect was still existent even after the exercise training conducted. So exercise did not seem to have any effect on insulin sensitivity and its relation with caffeine intake.
The study negates the recent reports that say that caffeine may help in overcoming insulin resistance.
Reference: Journal Diabetes Care, March 2005