I too believe strongly in a post workout pro-carb shake. The thing is, after a workout you aren't going to store it as fat, it will replenish your muscle and liver glycogen. Studies have shown that after a workout (intense) a person weighing 200 pounds can ingest almost a gram per pound of bodyweight without a resulting fat gain. You obviously don't want to take in that many while dieting, but the poing remains that you are very unlikely to store post workout carbs as bodyfat.