Saturday, February 20, 2010
Adenosine is an important nucleoside involved in (one of its many roles of cellular signaling) insulin signaling and glucose uptake and disappearance. Caffeine happens to be an adenosine receptor antagonist; this means that caffeine will block the actions of adenosine. In this case, we are considering its specific actions on adenosine that effect insulin signaling and glucose transport.
So what does it all mean? Below is a study published in Diabetes in October 2001. Don't worry, the science still applies to today. The findings of the study? Apparently caffeine decreases glucose disposal and suggests that adenosine plays a role in regulating glucose disposal in resting humans. So caffeine can have a blunting effect on insulin sensitivity, thus inhibiting your body's ability to take glucose and use it for energy as effectively as possible.
So should you eliminate caffeine completely from your daily routine? I'm not going to eliminate it from my diet. A black coffee or Americano is essential to my existence (well, not really). Should you take breaks from caffeine every once in a while? It's probably not a bad idea. However, there are benefits to caffeine, but we'll save that for another day.
Will caffeine make you fat? I'm going to go out on a limb and say...NO! But I think it's always important to know exactly how things that you ingest can impact your overall health and fitness.
Until next time...
Posted by Sterling Purdy at Saturday, February 20, 2010