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Hi there @laurenr! I realize this response is a long time coming, but did want to take the time to address your post. On Fitbit's helpsite, if you search for Aria accuracy, you will get a very interesting article on how to keep your Aria accurate and it will provide a link in which you can get information on determining what a healthy body fat is for you. Click on this article to get this information.
Good luck! 
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