If you choose to reset your profile, your account will be reset to day one as if you just registered. All weigh-in data will be available to view, but will no longer be used to calculate your macros each week.
To reset your account:
1) Open your Avatar app or web dashboard
2) Open the main app menu indicated by 3 stacked lines
3) Open General Settings
4) Click the Reset Profile button
5) Choose the appropriate reset option for your situation