From his femalemuscle.com question and answers:
"In my opinion, a moderate carb diet, with slight carb restriction (especially at night) is the most effective (and most "sane") way for bodybuilders to get ripped. For example, my contest diet is about 175 -200 grams of carbs with most of the carbs eaten early in the day. Every 4th day, I have a high carb day (350 grams) to replenish my depleted glycogen stores. By contrast, my off-season diet is 350 - 450 grams of carbs. With 175 - 200 grams of carbs, that is just enough fuel to provide the energy I needed to train hard and to prevent me from losing muscle.
Would dropping carbs even further to 30 or 50 grams a day (like many fad diets recommend) get you more ripped or get you ripped faster? Maybe. But the problem is, without carbs, you'll have no energy to train hard. Sure, tuna fish and water will get you ripped alright, but if your workouts suffer because your diet is "killing you," you aren't going to look or feel your best.
Another big problem caused by very low carb diets is loss of lean body mass. The lower you drop your carbs, the more likely you are to lose muscle along with the fat.
A third problem with very low carb diets is the rebound effect. The lower you drop your carbs, the faster you will rebound and gain the fat back when you add the carbs back in. I swear I've seen guys blow up 30-40 lbs in a matter of DAYS after their contest because they went on a carbohydrate and fat binge after a four-month zero carb diet. It wasn't a pretty sight! "