How do I change my email address?
From the Website
You can change the email address on your account by logging into our website at http://www.myfitnesspal.com. Mobile app users should log in using the same email address and password they use in the app.
Once you've logged in, click "My Home," then "Settings," then "Change email address/preferences." On that page, you can modify the email address for your account. Make sure you hit the green "save changes" button at the bottom of the page when you have finished.
In our Android and iOS apps,
In the Menu (or "More" page) tap "Settings" then "Profile" then "Email address." Be sure to save your changes