Skipping breakfast - metabolism at a crawl?

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I skipped breakfast today...i know it's not recommended, but whtever....my metabolism has definitely slowed down i since I started this. I am however exercising way more than before I started.

Does the 300-600 calories of exercise get the metabolism going again? Or is food metabolism different than exercised metabolism?

Understandably poorly phrased, but you get what I'm asking, I hope.

[always up for more MFP friends...feel free to add]