The former soap star, who shot to fame in the role of Mandy Dingle in ITV's Emmerdale, appeared on Loose Women to speak about the downsides of her incredible achievement, and why she's still not happy with what she sees in the mirror.
'I've got severe excess skin. Say a lady's had three kids. I've got that much... The scar will go from hip to hip and down my front,' the 40-year-old revealed, adding that she's planning to undergo surgery.
'The skin is going to be pulled all the way. It's the reflection I'm still struggling with. I saw a picture of Tina Malone [who went from a size 28 to a size 6] in the bra and panties - and mine's much worse than hers.'
Lisa, pictured in 2014, has dropped from 21 stone at her heaviest to around 11 stone
Explaining how she'd slimmed from a size 30 to a size 14/16, Lisa said, 'I have smaller portions now. I don't believe in fad diets, even though I have tried them before. I have no food after 6.30pm.'
'I only eat a carb if I need one and absolutely no bread or booze. I've been going to Zumba classes which is fun. I find the gym is boring.'
Lisa says that getting her excess skin removed will be her 'finish line'
And all of her hard work is certainly paying off, as she's approaching her next major weight loss milestone.
'I'm approaching 11 stone. That weepy moment, I had it two weeks ago.'
However, despite her progress, Lisa says that some people aren't as thrilled with her transformation as she is.
'Some people want me to fail, they say - don't, you wont be the same person. you look ill!'
'Am I going to go back to eating a bowl of pasta and garlic bread for my dinner? Probably not. I don't go for the crisps now, I'm driving my friends mental not drinking.'
'Everything's a milestone and I'm going through it daily. I never in a million years thought I'd be sat here in this dress. I'm not going to go back to my old ways. I feel like I've got the body I deserve, without my stomach clapping every time I go up the stairs!'