I keep coming across various articles on carb cycling. In general, followers eat a low carb diet with periodic increases in carbohydrate intake. We're not talking about going high carb, but adding in some starchy vegetables, whole grains and fruits for a short time. The interval, duration, and carb intake levels during the moderate carb period varies but nobody is advocating binging on pasta, white bread and donuts.

What say you? Is there any valid reason to periodically allow increased carbs or is it just a glorified excuse to cheat?