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This study underscores at least two points. First, a reduction in carb intake appears to increase the use of fat during aerobic exercise. Second, drastically lowering carb intake for short periods will not adversely affect aerobic exercise. But what, about anaerobic exercise?

Other studies show that depleted muscle glycogen will not hamper anaerobic exercise as much as you'd expect, providing that a source of circulating blood glucose is available. Usually this glucose comes from liver glycogen stores, but a very-low-carb diet will deplete liver glycagen in 12 hours - what happens then? If no carbs are available, the body will convert branched-chain amino acids stared in muscle into glucose in a process occurring in the liver called glucaneogenesis.

But this will only happen if you're consuming a low-protein diet, an uncommon regimen in bodybuilding circles. In most instances, the body will convert excess food protein - up to 57% of protein calories - into glucose. The biggest problem with low-carb diets is that if you consume fewer than 50 grams of carbs a day, your body will convert active thyroid hormone (13) into an inert form called reverse 13. The body uses this device for protection against self-cannibalization. of tissue, such as muscle. Ketones also prevent muscle breakdown during low-carb diets.

Aerobic Exercise and Low Carbohydrate Diets