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Your metabolism is based on how efficiently your body tissues process nutrition and so your metabolism should be great. If you're asking about causality, running more can improve your metabolism, but having a high metabolism rate does not mean you will be an excellent runner. I am an endomorph and my metabolism is naturally really bad, but after a couple years of training, I've become a pretty good runner and my metabolism has improved. I have friends though who have excellent metabolism but are terrible runners. You need stamina to run, not a good metabolism.
But wait a minute: Kenyan runners eat tons of ugali (cornmeal porridge), whereas American runners eat none. And Japanese runners eat lots of fish while Ethiopian runners are more partial to teff. In short, elite runners in different places eat different foods, so it doesnât seem possible to copy their diet generally. Eating like an elite does not mean eating the specific foods that any particular group of elite runners eat. Rather, it means emulating their key dietary habits.