Aside from skin, bone, blood, and organs, the majority of our body weight is made up from muscle and fat; but, there are some interesting facts that you probably are not aware of regarding the two.
Namely, that our genetic makeup is determined before birth and dictates the number of muscle cells and the fat cells that we have; this, we obviously have no control over. What we can control is the size and number of these cells. But, what you may not realize is that we cannot control both parameters for each type of cell. Let's take a closer look at each…
Muscle Cells
As I mentioned, the number of muscle cells within our bodies is genetically determined before birth and is the number of muscle cells we will have throughout our lives. As some individual's age, this number will decline, but for the most part it can and will remain unchanged.
The process of building muscle comes from building or increasing the size of the muscle cells we have, not by building "more" muscle. However, I should note that research has shown that the use of some performance enhancing drugs (PEDs) can increase the number of muscle cells.
Muscle cell size grows naturally throughout childhood and adolescence until reaching adult-sized cells, typically in late teenage years. From that point forward, the cell size is determined by the individual. The sedentary couch potato, for example, will actually experience a reduction in muscle cell size due to a lack of exercise. Someone who engages in moderate physical activity and exercises on a regular basis will experience very little change in muscle cell size, while bodybuilders, or any athlete that trains by overloading their muscles with intense physical activity, will experience an increase in muscle cell size.
Fat Cells
Like muscle cells, the number of fat cells we each have is also determined before birth. Each of us, on average, are born with anywhere from 5-to-10 billion fat cells. A surprising fact concerning fat cells is that during the first year of life, they grow so quickly that they become adult-sized fat cells often within the very first year. From that time forward, the fat cells can grow in size. But unlike muscle cells, which will only grow through overloading them via physical activity and exercise, fat cells grow through a lack of physical activity and, most notably, a poor diet; this should obviously come as no surprise.
This is part 1 of a 2-part series. Check back next week for part 2, which will discuss how you can manage the size of muscle and fat cells in your body.
Check here for more info regarding obesity and the over weight epidemic in America.
Resources:
Big Fat Lies: The Truth about Your Weight and Your Health. By Glenn A. Gasser.
The Medical News
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