Kyle Sandilands opened up about his weight loss journey on his KIIS FM radio show on Monday.

The 51-year-old was surprised to learn he had lost an impressive 20kgs after his co-host Jackie O Henderson encouraged him to weigh himself.

‘You were 140kgs at your biggest. You look good and you are definitely not like you used to be,’ she said.

Kyle then stepped onto the scales to learn he now weighed 121kgs and Jackie O said: ‘Oh my God, you’re 20kgs lighter!’

‘And that’s without any effort and I didn’t get paid $1million from Weight Watchers and I’ve still done it,’ he added, referring to the weight loss program Jackie O is an ambassador for.

Kyle Sandilands (pictured) revealed his impressive 20kg weight loss as he addressed his health journey live on air on Monday

It comes after Jackie O recently revealed she had dropped an impressive 12kg after overhauling her diet and lifestyle.

She spoke about her new diet on The Kyle and Jackie O Show and said she often skips breakfast, a practice known as intermittent fasting.

She also avoids carbohydrates, and satiates her hunger throughout the day by snacking on pre-cut pieces of steak.

‘I cook steak and slice it, and then I’ll just have a little sliver of steak if I’m hungry,’ Jackie said.

She resists splurging on high-calorie foods for lunch, opting to eat just ‘three little slivers of steak’ and a few Vietnamese rice paper rolls containing fish and cabbage.

The 51-year-old was surprised to learn he had lost an impressive 20kgs after his co-host Jackie O Henderson encouraged him to weigh himself

Her co-host Kyle Sandilands was shocked by her small portion size, telling her: ‘A dog would eat more!’

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

In between meals, Jackie treats herself to smoothies and Starbucks Frappuccinos, a type of blended ice coffee drink.

Jackie was also recently forced to warn her fans to be careful after scammers used her name to promote and sell diet pills.

She shared a photo to Instagram of the fake campaign which featured images of her drastically photoshopped body.

It comes after Kyle’s co-host Jackie O recently revealed she had dropped an impressive 12kg after overhauling her diet and lifestyle

‘Another day another scam!!! If you see me ‘advertising’ keto gummies, it ain’t true. But I’m loving their Photoshopped pics,’ she wrote.

In one image, Jackie O’s face was edited to appear much fuller while another showed her looking slim.

The ad also included a fake quote from the radio presenter, which read: ‘Now I weigh 57kg and I want to lose another 3-5kilos.’

‘The most important question is how I managed to do it. I mean my Instagram profile is full of food pics. Yes, I love to eat! I haven’t changed my diet and I still eat sweets. I’m eating ice cream as I write this article.’

She also spoke about her new diet on The Kyle and Jackie O Show and said she often skips breakfast, a practice known as intermittent fasting