Did you know that everytime you gain fat you not only enlarge your fat cells but they actually multiply in a process called FAT CELL HYPERPLASIA. To explain, imagine a person who weighs 85 kgs but gains 10 kgs making him 95 kgs after mistreating his diet and slacking off at training. Lets say hypothetically that he had 1000 fat cells at 85kgs. When he went from 85 to 95 those 1000 fat cells enlarged but also multiplied giving him 1300 fat cells. Now this doesnt mean he cant loose that weight, it doesnt neccissarily make it any harder to LOOSE that the extra weight by sticking to a good diet and training program but once you mutiply your fat cells its PERMENANT!!! you cant ever loose them. What does this mean? Well it means that when you slack off your diet again you will gain fat at a faster rate! This is why when many overweight people loose a lot of weight but then go back to bad habbits they put it all back on and in some cases even more! This is why the conventional bodybuilding approach to bulking is not optimal.