Natalie Cassidy now believes her weight-loss DVD was a "mistake" despite netting her £100k.
The EastEnders legend has admitted she now regrets the project.
Actress Natalie, best known as Sonia Fowler on the long-running BBC soap, revealed she was offered the huge amount of cash to ditch the pounds in a short space of time.
The 39-year-old released two weight-loss DVDs on the back of her results - Natalie Cassidy's Then and Now in 2007, before she released The Perfect Ten a number of years later.
She confessed she put the weight back on soon after she signed the deal.
Speaking on the Comfort Eating with Grace Dent podcast, the star said: "I was very overweight and they approached me and said listen, we're going to give you £100,000, we're going to get you really fit and you're going to lose four stone.
"I was like happy days, let's go for it. I just thought, that's a lot of money; but it wasn't the right thing to do.
"It wasn't - you are losing a lot of weight in a three or four-month period, twelve or sixteen weeks, low calories and training every day.
"I got there, and as soon as that DVD came out, I ate for England. I put all the weight back on in eight weeks."
Natalie then joked she'd look like Kate Moss if she didn't love mayonnaise so much and opened up on the fat-shaming she experienced while starring on Strictly Come Dancing in 2009.
Talking about how she felt "ridiculed" while on the show, she explained she was "about four stone bigger than I am now".
Speaking on the Ry-union podcast with Rylan in February she added: "Vincenzo (Simone) was quite little," she said. "And I remember one week, it was like, ‘Oh we're going to do this dance, but you’re going to pick up Vincent’.
"And I think about it now and I think, ‘Oh, that was out of order. It was a bit out of order to me.’ You couldn’t do that now.”
However, she has did confess that the experience was "the best job outside of EastEnders".
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