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Check the MFP website, as I've seen a number of times where the problem is on their end.
Best Answer@Jim:
I haven't seen MFP say its their issue as you state. Regardless, I hope it gets resolved soon as it's made the integration quite un-usable. Ultimately I hope that fitbit improves its food entry section and database and adds a barcode reader, and nutrient tracking. Wishful thinking probably.
ETA: given the number of "syncing" threads below (not all MFP) I'd say the issue is on the fitbit side.
Mine developed problems this week....my exercise from yesterday for example still hasn't synched to mfp. Makes it worthless having the two connected.