The bubbly presenter chatted to Phil and Holly about how her struggle to combat her love for sweet treats has been extremely difficult, after it was revealed on Sugar Free Farm that she consumes about 666 chocolate bars a year on average.
A clip from the programme was shown, in which Alison admits, 'chocolate is like my crack cocaine. I love it, I can't do without it,' before breaking down in tears.
'I get a real big buzz when I eat sweet food,' she continued. 'I get a physical reaction and just feel happy - and then I want another one.
'No one wants to be super-obese, I tell you, but what I can say is I'm addicted. I feel there's another Alison inside, dying to come out.'
Alison shared the sofa with BGT duo Stavros Flatley, who also took part in Sugar Free Farm
She then revealed that her addiction has become so extreme that her 11-year-old son has had to intervene, saying: 'My son sometimes hides my chocolate from me.'
The star is making progress after joining Gemma Collins and Joe Pasquale on Sugar Free Farm, and she's lost two stone already.
'I've totally changed shape, and my clothes are fitting a lot nicer now,' she told Best magazine.
'I've lost two stone since I filmed Sugar Free Farm. OK, so I might not have shed ten stone, which is the amount I need to lose but, for me, it's not so much about the weight loss: it's more about feeling better in myself, and I'm definitely feeling a good deal happier now.'
Alison previously spoke out about her health concerns earlier this year, when she weighed over 20 stone and feared the consequences if she failed to shift the pounds.
Mum of one Alison shared her fears in an interview with Bella magazine, saying, 'my poor body might not be able to cope for much longer so I have to help it out by taking weight off.'
However, instead of a quick fix or drastic measures she says she'll be making small changes to her diet and lifestyle to see the weight comes off in a controlled and healthier way.
The TV star admitted that she's always struggled with losing weight, saying: 'It's the one thing in my life that I feel like I can't achieve.
'When you get really big like me, you don't see any light at the end of the tunnel.
'I need to do it in small stages. If I just try and live healthily and drink lots of water, the weight loss will come. If I lose one or two stone it's not going to be obvious to anybody but I'll feel better in myself.'
Speaking about her goal Alison said that she'd love to lose nearly half of her weight, saying, 'I'm 20-something stone. I'd love to weigh 12 stone, that's the ideal weight for my height - I'm 5ft 9in - but if I got to 15 stone and around a size 14 to 16 I'd be over the moon.'
Having recently enrolled in a fitness club in Ibiza to try and lose weight Alison says she thinks she's finally been given the push that she needs. She enthusiastically explained: 'I would [go back] because actually talk to you about food and why you eat and about emotional eating.
'For someone as big as me it's really tough because it's like I'm carrying a man on my back with my weight.'
Alison credits Lisa Riley as her inspiration. The pair have both starred on Strictly Come Dancing and Lisa lost eight stone following the show.
Alison says: 'She's an inspiration for bigger girls. Being big isn't great for your joints and stuff - I'm testimony to that. It's time to take some of that weight off my joints.'