When you're in the South African jungle with a bunch of celebrities who have to go through some pretty intense challenges for a decent meal, you're bound to lose a kilo or two.
It's well known that the cast of I'm A Celebrity... Get Me Out Of Here! are given basic rations to live off of as the show is filming, which includes 5g of oats, 45g of beans, 50g of brown rice, 200g of vegetables and two tablespoons of olive oil, equalling 800 calories.
If the stars want anything more than that, they need to earn their treats by competing in Tucker Trials and other intense challenges.
Peter Rowsthorn, who is most well-known for playing Brett on Kath & Kim, is currently in the jungle and last night, he showed his campmates how much weight he's lost since entering the jungle a few weeks ago.
The actor and comedian told the campers that "1998 was the last time I felt this fit" and Josh Gibson said that he's "loved seeing the transformation in his body, in his mood".
Josh has been making sure that Peter is staying fit whilst they're both in the jungle and it clearly seems to be working!