The following was written by Charles Washington in response to a newspaper article in the Atlanta Journal-Constitution written by Chris Rosenbloom, Ph.D., R.D. Charles is a zero-carb guy who stays active with weightlifting and marathon running. He does a pretty good job explaining how the body fuels itself so I left it in his own words. Enjoy!

Those who recommend carbohydrates as the “best fuel for the body” don’t seem to realize two very important points:

First, the body can't store carbohydrates in large quantities and most people already get more than enough carbohydrates to fuel their bodies' daily activities. All carbohydrates, whether they are bread, pasta, sugar or jam when you put them in your mouth, enter the bloodstream as glucose. And the bloodstream can only hold so much.

The body, being a well-run power plant, puts the leftovers in storage to use in the future if it's needed. Some is stored as a type of starch called glycogen, but as it can't store much of this, the body turns most of the excess into fat and keeps it on deposit in the body's fat cells. We see it walking around the streets wherever we go, hanging off bodies in a most unattractive way.

Put simply, carbo-loading cannot work simply because excess carbohydrates are not stored in a readily usable way.

The second problem lies in how the body uses its various options for fuel. Each of our body's cells contains lots of very small power plants called mitochondria. It is they that produce the energy we need from the food that we consume. Glucose is usually called the body's 'preferred fuel' because, if it is available, our bodies have been conditioned from birth to use it first. But it is not the best fuel. That distinction belongs to fats--or fatty acids, to give them their scientific name. Before the mitochondria can use either glucose or fatty acid as a fuel, it has to be transported into the mitochondria.

Fatty acids are transported into the mitochondria as completely intact molecules. Glucose, on the other hand, can be transported only after it has been broken down first into pyruvate by the process of glycolysis. This is then used anaerobically to produce energy with lactate as a by-product.

The by-products of the energy-production process when fatty acids are used are carbon dioxide and water, both of which are easily excreted. But when glucose is used, the lactic acid produced in the conversion process can build up in muscle cells and make them ache. It is this that is the cause of the aching muscles or pain involved in strenuous exercise--'the wall' as athletes call it. This 'wall' severely limits an athlete's performance.

So why would a person want to limit their performance by using carbohydrates for fuel?