Don't eat unless you fill hungry.

Don't eat unless you fill hungry.
It was part of the diet of the Prophet Mohamed. Maybe it was also in
other religions. It's a kind of philosophy that you need to think about
it deeply.
Ask yourself this question.
Do I eat until I feel hungry?
Do you known really what is the feeling of hunger?
Muslims known what is this feeling because they fast for one month
every year but forget about it after the end of Ramadhan.
Just practice it. Don't eat until you feel that you are really really
hungry.
Talk to yourself.
Say, I'm not going to eat anything until I have this feeling.
It looks easy but not evident.