As a person grows, the size of these cells increases. However, an activity like weightlifting can also increase the size of muscle cells. In the case of fat cells, people are usually born with between 5 billion and 10 billion of them. As we grow older, this number increases to about 20 billion for a thin person and to about 100 billion for an obese person. Myths about body fat Myth number 1 is that fat can be turned into muscle, or vice versa.
Muscle is a tissue and fat is a substance.
Therefore muscle and fat cannot create one another. Myth number 2 is that if you weigh more on the scale, you must be overweight. This is untrue. In other words, you can increase your actual body weight without increasing your body fat. You can even increase your body weight and at the same time decrease your percentage of body fat.