But the Australian boxer emphasised he was keen to replenish his stocks as soon as possible.
"Man, you see - I made weight," Mundine gloated at pre-fight press conference in on Tuesday Sydney.
"I'm probably underweight right now so I'll have a little something to eat and see how we go."
After being bizarre, moody and unusually silent at his press conference on Monday, the former two-time WBA Super Middleweight champion, who has made a career out of trash talking his opponents, was back to his talkative self.
Asked why he was in better spirits on Tuesday, Mundine replied: "I dunno. Just closer (to the fight), getting nearer.
"You're supposed to get more nervous but I'm more relaxed. This is the time when you just enjoy everything that's going on, focus on what you're going to do tomorrow night and you get excited."
When he was pressed on a fight prediction, 38-year-old Mundine confidently backed himself, saying: "I believe I'm going to win.
"I mean, listen, I've got all due respect to Shane. I just think right now, the times in our career right now, I'm the better man but that's what's so intriguing about the fight.
"I've got to prove that and Shane wants to prove what he believes so I think people are going to get their money's worth."
Meanwhile, American boxing great Mosley let Mundine grab the headlines, simply adding: "I feel great.
"I guess now we can get a little something to eat, replenish our bodies and get together I guess."
The winner will take home the WBA super welterweight title, while a loss for either man will likely prove career-ending.
Anthony Mundine ready to eat after weigh in
