@Bugsy40 : That is not true. MFP wants to keep your eyeballs on their site, so they tell you to log everything on MFP. Most of us here find that it works best to log all food on MFP and all exercise on Fitbit.

The reason for logging food on MFP is that their database and interface are better than Fitbit's. (Plus, I'm not sure if food logged on Fitbit syncs over to MFP.)

The reason for logging exercise on Fitbit is that: 1) Fitbit is going to track a lot of your exercise already. If you then go in and manually log it in MFP, you'll overwrite Fitbit's better estimate and data with a uniform block of data; and 2) for exercise that Fitbit can't track well (swimming, yoga, weight lifting, etc.) the algorithm that Fitbit uses to estimate calories is thought to be superior to MFP's algorithm. MFP is notorious for overestimating exercise calories.

When it comes to manually entering exercises, as long as you only log it in one place - either Fitbit or MFP, but not both - you won't double count.

I would recommend reading the FAQ found in the stickies. It has this info, plus logs more. Here's a handy link: http://community.myfitnesspal.com/en/discussion/10098937/faq-syncing-logging-food-exercise-calorie-adjustments-activity-levels-accuracy/p1

https://www.fitbit.com/user/2F7SHG

Hubby bought me the blaze with the purple band - it's wonderful!