Yeah, escapee mentions something important, too, about thin people and the BMI. I don't put much stock in the BMI, because it's purely a ratio of height to weight--it does not factor in the percentage of body fat or anything. You could be 20 lbs. over your "ideal" weight and have it be all fat from a sedentary lifestyle and poor nutrition, OR you could be the same 20 lbs. overweight and have it be all muscle mass from lots of bodybuilding and proper nutrition...but according to the BMI, there's no difference, although we all can assess that the two examples are completely different in their overall health.
What's more, not everyone is going to be able to shape their body the same way due to genetics--your body may look overly fat or overly skinny from the outside, but that doesn't necessarily equate to what's going on INSIDE. It's the difference between being an ectomorph, an endomorph, or a mesomorph. Ectomorphs are the string beans--the people that can't seem to put on much mass (muscle or fat) regardless of what they do. Endomorphs are the much rounder types, who appear to be overweight and fat, even if they're body is perfectly healthy. Mesomorphs are the classical bodybuilder types that represent the figure most of us covet and regard as "healthy." So you could be super skinny and still be just another out-of-shape ectomorph, or you could be a rather large and round but still very fit endomorph--looks aren't everything, and you can't judge a book by its cover.
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