Loyal Jew
Eating a lot is not gezel unless you are eating someone elses food! If you paid for it and made a brocha its not gezel!
1. It could be just giving in to Tayva.
2. Destructive to the body which is against Venishmartem meod lnafshoseichem.
3. Possibly baal tashchis of the food if the person is no longer really enjoying it and just “fressing.”
4. A bad idea because it will make you unhealthy which will make your quality of life worse as well as make it harder to do anything including mitzvos.