Generally, there are about 30 billion fat cells in a human body. Unlike other cells which are mostly made of protein, fat cells are made of fat tissues.
Some people only pay attention to what they eat when attempting to slim down, for example by going on a diet, converting to a vegetarian diet, or even abstained from food, thinking that they can used up their stored fat in this way and slim down. This is in fact only a trade-off approach. Medical studies have proven that for every pound (0.454 kilograms) of weight loss through dieting or going vegetarian, one third of it are fats but the other two-third are non-fatty substances essential to the human body. This means that more of useful substances are lost than fats.
Most experts believe that the right slim diet approach is to control fat intake, ensure the consumption of sufficient amount of protein, vitamins and trace elements, as well as exercise regularly. This will help you to lose weight and maintain your fitness level while making the process much more enjoyable. The correct way to gauging any slimming effect is not to look at the numbers on the weighing scale but to see if the percentage of fat in the body has gone down. When tested with equipments, the acceptable percentage of fat for an average middle-age man should be between 18% and 22%, and an average middle-age woman should be between 22% and 26%. Those who exceed these figures by 5% are mildly obese, by 10% are moderately obese, and by more than 20% are considered severely obese. The good way to losing weight is to significantly reduce the percentage of fat in the body by exercising. Dieting definitely leads to failure because although your body weight will go down, but the percentage of fat in your body may not, and may even go up.