Former Australian rugby player Peter Fitzsimons joins Mike Hosking to talk about his dramatic weight loss, after writing a book about it.

He said cutting out sugar was half the battle, but also said that there's no magic to it - you just need to take a good hard look at yourself. 

"This is not about going on a diet, this is about changing your diet."

"You've got to put your big boy pants on, and look around and see how many fat 75 year olds there are - they're not there."  

He said his aim is not to fat-shame people, but rather push the message that people who are seriously overweight and with bad diets will simply die earlier.