Building and cutting at the same time. These are two opposing things. For a brand new beginner it usually occurs uite readily, especially if the beginner is not used to weight training in any form. After a few months it will plateau. Most strategies have you building for a few weeks, then losing fat for a few weeks. Is it impoosible to do both for an experienced lifter? No. Not at all, just beware it is going to take a lot of experimenttion and "walking a fine line: with diet. There is no one magic way. Dr. squat, on his web page, talks of a zig zag diet, where you cycle between higher and lower calorie days, and yes, you do that by adding and subtracting carbs and fats. Other methods are cyclical ketogenic diets, where you low carb for a few days then do a 1-2 carb up days. What was very popular back in my day (early 60's) was Vince Gironda's version of a CKD (which could be considered carb cycling). He trained a lot of the bigger BB stars back then, i.e. Larry Scott, Dave Draper, etc After the trainee had a good solid base, he would put them on 4 ays of low carb , being defined as 60 gr dat (give or take a few), not worry so much about fat, but obviously don't sit down and eat a brick of cheese in one setting, then on the 5th day, eat moderate amount of carbs (think 40-50% total calories), cut back on the fat (as they don't really go too well together) and moderate protein. There are a lot of variations on this. There was a company, in the early 90's, run by Scott Chinery, can't remember the name, but they sold these supplement kits, along with an instruction booklet. Similar to the old Icopro kits. They actuallydid have a really wid form of carb cycling that was laid out in the book . Two days low carb, one day medium, the next very high carb, or something to that effect. Might want to do a search on Dr. DiPasquale's Anabolic Diet, or his new one The Metabolic Diet. They both involve carb cycling. Dan Duchaine's BodyOpus does as well. You can also check out lyle McDonald;s (MacDonald ? sp?) site. He has pretty decent forum's over there and is much more knowledgeable in this area than I am.