Metabolism Period

Does dietary fiber speed up or slow down your metabolism?
In some articles, I read that insoluble fiber slows down your metabolism, making you feel full for a longer period of time.
In other articles, however, I read that in order to speed up your metabolism, you should eat foods containing dietary fiber (complex carbohydrates, fruit, nuts, etc).
I already eat plenty of dietary fiber, but I would like to understand its effects on my metabolism.
Thanks! (=
Definitely speeds it up.
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