A low carb diet is important, but carbs, in general, are not necessarily the enemy. Rather, it is the type of carbs you eat and when you take them. Focus mostly on low glycemic (slow) carbs (look up glycemic index on the google). They don't cause a spike in blood sugar, which means insulin doesn't come into play and take excess unused carbs and cause them to be stored as fat. High glycemic (fast) carbs are best taken right after your workouts to replenish glycogen lost from your muscles during training. Pretty much, as the old saying goes, no carbs after sunset (as a very loose rule of thumb), unless you are trying to bulk up. You can cut the carbs fairly low if you want to get radical, but remember that you brain needs at least 60 grams per day to function. In general, I found that the 40 carbs/40 protein/20 good fats plan (the old zone diet) is pretty good. If you go high protein, remember to drink lots of water, because high protein diets put a load on your kidneys. Plus drinking lots of water (and green tea, btw, is very helpful for losing fat. Another factor to keep in mind is that one gram of carbs and one gram of protein have the same caloric value, approximately 4.5 calories (fats have about 9 calories). One difference is that your body will work much harder to metabolize the protein. If you are trying to lose some fat by cutting carbs and increasing protein, that is a good thing to know.