Hartz believes the secret to her health and look using age as an excuse.
I know how hard it is to quit sugar.
It feels like a whirlwind.
Ask a middle-aged woman, and she might say these slights have whittled away at her self-confidence, tricking her into believing the best years are behind her.
The mum-of three, who turns 70 in July, has been inundated with media requests since photos emerged of her looking sexy in a bikini two weeks ago.
But if I can, so can anyone.
However the Perth-based Hartz, who is the author of Sugar Free Baking, is taking it all in her stride.
I was a sugar addict.