It was a family tragedy that made Los Angeles mum Justine McCabe start piling on the weight.

In 2015, her husband took his own life, and Justine began emotionally eating as a way to cope with the devastating loss.

But then she had a "turning point", when she finally realised she needed to make more out of her life.

So the determined mum, who weighed over 139 kilos at her heaviest, set about making a change.

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She documented her journey on Instagram, and has recently posted a time lapse video that shows what is really like to lose over 57 kilograms.

"I turned my pain into energy. I let it move me and push me. I was angry and I was done. It was time to shove life back," she wrote on Instagram.

The courageous mum documented her weight loss on social media. Photo / Instagram
The courageous mum documented her weight loss on social media. Photo / Instagram

The video has attracted a wave of support from her followers, and many have said she inspired them to change their own lives.

With the encouragement of family and friends, Justine began with gentle gym session to help shift the weight. She eventually became a gym fan, and started going up to six times a week.

Justine has lost more than 57kg. Photo / Instagram
Justine has lost more than 57kg. Photo / Instagram

In an interview with The Mirror, Justine said dealing with the tragic loss of her husband taught her she could learn to cope with anything.

"I knew if I could survive living without my husband and mum then I should push my boundaries and limits to face all fears I had, to live a life they would be proud of," she told The Mirror.

-nzherald.co.nz