"That was a wake-up call ... the eldest male didn't even reach 70," she said.
She began going to the gym three years ago and did a course on healthy eating run by nutritionist David Hill, of the Otahuhu Recreation and Youth Centre, which helped her change her diet and made her study nutrition labels at the supermarket.
She began to enjoy the gym and became motivated to exercise and eat well.
"My daughter comes to the gym regularly and my partner as well, it's really become very family-oriented."
But she acknowledged that maintaining her weight loss had been difficult and said she had made it her goal "that I won't go back to that weight again".
Ms King said that as well as reducing the amount she ate, including fat, she now ate lots of vegetables and fruit.
She also reduced her salt intake because of her high blood pressure. Cholesterol hasn't been a problem for her but she switched to healthier spreads: from butter to margarine and now hummus. And she enjoys nuts and seeds in salads.
But she emphasised that her dietary changes had been gradual.
"I'm not on a strict diet. I do have treats once in a while."