It is ridiculous to think that our bodies would use a very inefficient fuel source for all our daily activities and even most of our physical activities (exercise).
Now if you choose to be a marathon runner or an Ironman distance triathlete you can stop reading this now because this post is not for you. “Chronic cardio” as it is often called in the Primal or Paleo world is defined as logging MANY miles (even hundreds) a week to train for these ultra-distance races. If you like to do these types of races that is fine (I won’t stop you) but just know that long bouts of cardio are detrimental to not only your overall health, your joints also take a beating, overtraining and illness are common place. Most everyone has seen the Sprinter Versus Marathoner picture. Now I know not all marathoners look like that guy but most sprinters look great and no self respecting guy has ever said I wish I had the body of a 140-lbs skinny fat marathon runner.
In very simple terms when we eat carbohydrates or simple sugars (preferred foods of the chronic cardio crowd) our body converts it to glucose which is either burned immediately as fuel (like during a long cardio session) or the glucose is transferred to the liver and muscles where it is stored as glycogen. Glycogen is the bodies reserve fuel source used when the body runs out of fat (the preferred fuel source) or during extremely high intensity efforts.
Depending on the person, Read the rest of this entry »