This app has no sign-up or membership registration, so there is no "account" to delete.
The app never charges you on its own and does not send the data you enter to our servers, so there is no problem with simply leaving the app on your device.
If you still want to remove the app, uninstall it from your device, and you are done.
We are sad to see you go, but we are truly glad you used our app. We hope you will remember us if you ever need it again. Thank you very much for using SmartDiet.