system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Can I shrink my stomach or become less hungry permanently from dieting?

Different countries tend to have different portion sizes. By eating less daily, could I permanently decrease my portions? Also if this is impossible as an adult, how about as a teen?
gpt
Nothing's permanent. But decrease your intake enough for long enough, you will feel full on less. But push it for awhile and you'll get used to more again.

Be careful not to develop a complex about it.