The physical constitution hard to gain weight is that a body is flexible. Conversely it is easy to gain weight if a body is inflexible.
The reason of gaining weight is that fat is not burnt. It is mitochondria that burns fat.
If a body is inflexible, muscle does not stretch. Blood vessel in such muscle cannot send fat to mitochondria. Thus, fat is accumulated to the body without being burnt.
Filed under: Body, Health
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