@1armydad from this help article on LoseIt's website (does not appear weight is something LoseIt included in their API to sync between the services):
What syncs between Lose It! and Fitbit?
Food: Lose It! sends your food logged over to Fitbit. You can see your foods in the Fitbit app and on Fitbit.com.
Calories Burned: The calories burned as tracked by your Fitbit tracker transfer to Lose It!.
Lose It! does not send exercises to Fitbit. Fitbit does not send food data to Lose It!. You should log your food in Lose It! (and let us send the data to Fitbit) and track your exercise via the Fitbit device (and let Fitbit send that data to Lose It!).
**Steps: You can see your steps from Fitbit in Lose It!. Go to the Goals section of the app and create a steps goal from the menu on the left. After you set up the goal, you’ll see steps data from Fitbit on your Goals screen.
**Sleep: You can see your sleep from Fitbit in Lose It!. Go to the Goals section of the app and create a sleep goal from the menu on the left. After you set up the goal, you’ll see sleep data from Fitbit on your Goals screen.
**Setting up custom goals for steps and sleep is part of our Premium upgrade. Learn more at www.loseit.com/premium.
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