High levels of caffeine may reduce body fat and the risk of type 2 diabetes
High levels of caffeine in your blood can help reduce the amount of body fat and even the risk of type 2 diabetes, according to a new study.
However, the study does not recommend any particular amount of coffee a person should drink to stay healthy
Previous research has suggested that drinking three to five cups of coffee - containing an average of 70-150 mg of caffeine - each day was associated with a lower risk of type 2 diabetes and cardiovascular disease.
But these were observational studies, which makes it difficult to separate the actual effect of caffeine from that of other potentially influential factors.
The latest study, published in the journal BMJ Medicine, used a technique known as Mendelian randomization, which uses genetic evidence to support a causal effect.
The researchers examined the role of two common gene variants associated with the rate of caffeine metabolism.
Researchers used these variants to determine "genetically predicted" blood caffeine levels among nearly 10,000 people who participated in six long-term studies.
They found that higher blood caffeine levels were associated with lower body mass index (BMI) and a reduced risk of type 2 diabetes.