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RE: Question regarding size, genetics, weight
Although excess caloric intake is undoubtedly a major cause of obesity, the reality is that we all have a lower limit on how much weight we can lose without resorting to extreme, unhealthy, and unsustainable measures, and that limit is determined by genetics. Some people have more muscle cells in certain areas, visceral mass, or fat cells than others, and these issues are genetic. Only a very small percentage of the population has the genetic attributes required for elite running. I have no idea where you are in terms of your genetic potential, but I will say that make runners who are genetically "designed" to weigh 120 lbs don't have to struggle and starve themselves to get there--they have always settled at that weight naturally.
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