Confused about Fitbit exercise calories

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Hi, I have a Fitbit flex 2 and it's synced with MFP. I'm a little confused about the 'exercise calories' that show up. The normal steps I take daily (I don't do any formal exercise yet, just my daily walking around) are enough to generate 300 or so extra calories per day. Can I eat those calories back if I'm really, really hungry some day or just leave them since I'm not formally exercising?

Stats in case they're important: 24 yo female, 5'2 and taking 1200 calories daily.

Thanks!

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