Who said, "The stomach is the home of sickness," and "We are a people who do not eat until we are hungry"?

The one who said, "The stomach is the home of all illness," is Al-Harith ibn Kaladah, and it is not a prophetic hadith. As for the one who said, "We do not eat until we become hungry," it has been said that it was the Messenger, may Allah bless him and grant him peace, but it was not narrated in the books of Sunnah. It has also been said that Umar said it.