Rachael Finch's trick to stop her 3-year-old eating too many birthday party treats.

Author, certified health coach and former Miss Universe model, Rachael Finch is raising her children on a sugar-free diet.

Now, she’t told The Morning Show how she prevents her eldest, three-year-old daughter Violet, from over-indulging at children’s parties.

“It does get a bit tricky because it’s hot chips and nuggets and sweets and lollies on the table,” the 28-year-old told The Morning Show.

“So I make sure before we leave the house I fill her up with good food and she knows it’s a treat.”

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That – understanding it’s a treat – is the most important thing, according to Finch’s husband Michael Miziner.

“That’s the the biggest thing: Knowing you can have it every now and again, but not every single day of your life,” Miziner, a dance instructor, also told The Morning Show.

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Finch has recently given birth to a son, Dominic, who is eight weeks old.

She hopes he, too, will grow up on a diet devoid of sugar and says laying that foundation is key to a healthy future.

Listen next: Rachael Finch tells us about her approach to parenting. (Post continues after audio.)

“The first years are easy because they don’t go to many birthday parties,” she said this morning.

“I feel like it’s my responsibility as a mother to set up that beautiful foundation at home with the understanding of wholesome real ingredients.”