[Goku tries to think of a time anyone saved his life and draws a blank- Konzen cares about him, he knows, but he can't think of any time he saved him from something that dire. Same with Ken-niichan and Ten-chan. Actually, he can't think of a time he was ever in danger of dying where he couldn't save himself.
But for some reason the phrase makes him feel a little nostalgic. ~Body memories~]
... I don't think I'm that hungry. [But he's still eating.]