Alison Hammond celebrates the launch of her new Channel 4 show after revealing the secret to her 11st weight loss

Alison Hammond showed off her 11-stone weight loss as she celebrated the launch of her new Channel 4 series Your Song on Wednesday.

The presenter, 51, had previously shared the secret to her slimmed-down figure after a pre-diabetes health warning pushed her to pursue a healthier lifestyle.

Joined by co-star Sam Ryder, Alison opted for a stylish denim zipped dress as she attended the launch.

The This Morning star is set to front the show, which features everyday people performing personal, meaningful songs on a traveling pop-up stage, with both Sam and Paloma Faith acting as mentors.

While Sam took to the stage to perform at the launch, Alison showed off her singing skills by joining him with a guitar in hand. 

Alison previously shared that she lost 11 stone by changing her 'childish mentality to food' and cutting out one of her favourite treats.

At her heaviest, the This Morning presenter weighed 30 stone, and she began her transformation five-years ago when she started working with a personal trainer to regain her fitness and begun a stricter diet.

Since then, the TV personality has also taken up Reformer Pilates and boxing, sharing videos of herself exercising online.

Speaking to the Radio Times about her improved regime, she said: 'I've had a personal trainer for five years, even when I was at my biggest. But I had a childish mentality with regards to food, especially toffees – but now I'll only have a couple a day.

'We're not getting any younger, are we, babes? You realise at some point you've got to look after yourself. I've got a speaker under my pillow to play relaxing music, and a sleep tracker.'

Alison's health kick started after she discovered she was pre-diabetic, the point where your blood sugar is higher than normal but not high enough to be diabetic.

Previously speaking to Women's Health, she said: 'My mum had Type 2 diabetes and she was worried for me, so when I then found out that I was pre-diabetic, that was frightening. I thought "I have to be an adult about this". The sweets had to stop, and the fatty foods.'

Alison recently revealed she has started Reformer Pilates and circuit classes in a bid to keep the weight off after revealing why she won't touch weight-loss jabs. 

As she works to maintain her figure after making lifestyle changes, Alison gave an insight into the measures she has taken.

Alison revealed that she has started the form of Pilates because she is as 'stiff as a board'.

She added: 'You feel absolutely incredible after it. I really need a good stretch - so Reformer Pilates has been brilliant for me. 

'I also do this early-morning circuit class from the brilliant Steve Hensel at Blue Zone. I'll go at 6.30am and do a full hour, it's a proper old-school gym.'

Alison said that she leaves the gym feeling 'amazing' after working hard, but while she is keen to try things, there is one wellness practice she won't adopt. 

She told Closer Magazine: 'I did try one of those cold plunge pools once - and absolutely not! It lasted about a minute. I was like, "Why am I literally trying to kill myself?"'

Reformer Pilates, loved by Meghan Markle and Jennifer Aniston, costs around £25 to £40 for a 45-minute class and is surging in popularity in the UK.

Alison revealed how she managed to lose the pounds without the assistance of weight-loss jabs, giving an insight into her exercise plan with her personal trainer.

She told Heat: 'I've got a personal trainer - she's amazing, she trains me when I can train. If I'm working, I don't train, I'll go for a walk. 

'But when I'm at home, I'll go and have a session with her in the morning, just an hour. It might be four days a week.'

She also revealed her approach to her diet, saying she hasn't cut anything out completely but focuses on 'moderation'. 'I don't deny myself anything, I eat everything, but in moderation,' she added.

Alison previously said weight-loss jabs weren't for her and opted against using them because she was 'frightened' of 'scary' stories surrounding them.

She told Good Housekeeping UK: 'I think that, for people who need to use them, they're a good thing - but for me, as soon as I hear any scare story, I get frightened.' 

The presenter added: 'So I haven't wanted to use them, but that's not to say I wouldn't in the future, and I certainly wouldn't look down on anyone who did.'

In an interview with the Daily Mail, she discussed how she stays trim while surrounded by cakes on The Great British Bake Off. 

She said: 'I eat a bit of Paul and Prue's after they've finished judging. I only try the ones that got a handshake from Paul or ones that won. If the judges aren't impressed, I'm not trying it.'