McSweeney told Woman's Day magazine: "I loved being pregnant. It was a great excuse to eat whatever I wanted and say, 'Oh I'm not fat, I'm pregnant!' After [son] Cameron was born, when I checked out of the hospital, my exit weight was the same I weight at full term before having my first child.
"I went to a drinks function and I bumped into a school friend who is 43 years old and was wearing shorts. She had lost 26kg and looked fantastic. I'd seen her a few months earlier and she was the same size as me then, so I asked how she had done it and she told me about her doctor."
McSweeney then took part in a day-long seminar and "shock medicine" tactics, including looking at pictures of food and overweight people followed by images of people who had lost weight. The course then began with a weigh-in and health check. Within three months, she had lost 29kg.
"It's down to simple changes," she said. "You can still have fish and chips. Just don't eat the chips and have the fish grilled. Or make fruit desserts and dont have the cake and cream with it. It has come down to willpower. I have given up alcohol and been very strict. But you don't have to live on celery sticks and carrots!"