Deleting removes your account and all cloud data (profile, diary, weights, streaks) permanently. This cannot be undone.
In the app (fastest):
Without the app: email sangramdhurve96@gmail.com from the Google address you signed in with, subject "Delete my ThaliScan account". We complete emailed requests within 30 days and confirm by reply.
What is deleted: account identifier, profile and plan, meal diary, weight/water/exercise logs, streaks and badges, scan counters. What is kept: nothing personal; anonymized crash/usage statistics that never identified you cannot be linked back.