According to this article, inactivity causes rapid increases in visceral fat, the kind of fat that surrounds your internal organs. You can look "skinny" and still have a high amount of visceral fat from a lack of exercise. Visceral fat has been found to have a strong impact on the metabolism, and it produces hormones on it's own. Namely it produces interleukin-6 (IL-6), an inflammatory molecule at many many times the amount in healthy active people.
I think this is interesting because I am very sedentary, and I took an online health assessment a few months ago that concluded I had systemic inflammation, but I couldn't figure out why. Now I just need to figure out how much and what type of exercise is most effective at reducing visceral fat...



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