more exercise means need more food, HELP!!

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Ok, so i've added another cardio most nights. Zumba which is fun, but my appetite is getting so extreme and my sweet craving is also increasing. all month i gain and loose the same blasted 4lbs. i know i can't eat any time after 7pm and until this last week i had been fairly good with what i eat. But salty and sweet has won out way too much this past week. I need to be stronger with resisting the sweets.