Hello @Chelsie9051, nice to have you here in the Fitbit Community! If you are using MyFitnessPal note that Fitbit does not send your activity to MyFitnessPal as a series of separate cardio exercises. Instead of this, it passes an adjustment of calories. To understand better this please take a look to the following article: What is the Calorie Adjustment in my Exercise Diary?
In your Fitbit account, the Food Plan's tools update based on your foods logged and activities recorded by your tracker. Your Fitbit tracker is always watching, so the more you exercise throughout the day, the greater your calorie allowance will be. For more in depth information about the Food plan tool, I believed the post kindly shared by @SebringDon will be very helpful. Take a moment to review this post: Fitbit's Food Plan Demystified.
Many users what they opt to do, is to leave exclusively MFP to log food and Fitbit to track exercise using the food plan intensity of your choice.
Hope this helps. Let me know if you have other questions.
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