Jackie ‘O’ Henderson shows off her slimmed-down figure as she takes her dog for a walk in Sydney

Jackie ‘O’ Henderson recently revealed that she had lost a whopping 18 kg in just five months.

And on Sunday, the radio host, 48, showed off her slimmed-down figure as she took her dog Sadie for a walk in Sydney.

The WW ambassador showed off her weight loss results in beige pants and a white T-shirt as she went for a walk on Coogee Beach with her dad Tony.

Jackie O completed her look with a pair of black sandals and wore sunglasses while holding her dog Sadie’s leash.

She tied her blonde locks into a high ponytail and wore a neutral makeup palette for the outing.

The mother of one recently spoke about her new diet on The Kyle and Jackie O Show, saying she often skips breakfast, a practice known as intermittent fasting.

She also avoids carbs and satisfies her hunger throughout the day by snacking on pre-cut pieces of steak.

“I cook steak and slice it, and then I just have a small piece of steak when I’m hungry,” Jackie said.

Resisting splurging on high-calorie foods for lunch, she chooses to eat only “three small pieces of steak” and a few Vietnamese rice paper rolls with fish and cabbage.

Her co-host Kyle Sandilands was shocked by her small portion size and told her, “A dog would eat more!”

For dinner, Jackie usually eats vegetables and a protein such as chicken or red meat.

Between meals, Jackie treats herself to smoothies and Starbucks Frappuccinos, a kind of blended iced coffee drink.

The mother of one has not always followed such a restrictive diet.

She told in February women’s Day before she got her health under control, she ate pizza, sausage rolls, and microwave meals from the gas station.

“I ate a lot of food that I could have quickly. You know, pizza and sandwiches and just takeout, I wasn’t cooking myself,” she said.

“And I think it’s always best if you know what you’re putting into your body. I just got really lazy.’