Please help me with fitbit!!

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So I bought a fitbit zip today... All I care about is the calories burned to make sure I'm at a deficit compared to my TDEE. I have an iPhone 4 so as luck would have it fitbit only syncs with iPhone 4S and newer, great!! I need some help just to make sure I'm doing this correctly to manually enter fitbit adjustment. My TDEE is 2449, I want to lose two pounds or week so I need 1000 cal a day deficit so I'm going to have 1400 calories a day. I need to be sure fitbit reads at least 2449 right? And if it's reads 2649 (for example) would I enter 200 into exercise as fitbit adjustment?? (I realize I'll need to recalculate my TDEE for every 5 pounds lost). Please shed some light!!!!

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