Lorraine Kelly, 58, presenter of the Lorraine show, revealed she has put on weight through doing dry January.
While many do dry January for health reasons after an indulgent Christmas period.
However, for Lorraine – who has slimmed down from a size 14 to a size 10 – the health kick has had the opposite effect.
“Can I tell you something, I feel as if I’ve had a hangover for a month, and I’ve put weight on,” she told Good Morning Britain presenters.
The reason, she confessed, is because she’d swapped her usual alcohol for sweet treats.
This has had a bad effect on her diet: “I’ve been eating chocolate instead of gin.”
“I needed something!”, she added, laughing as she spoke on the ITV show.
Lorraine Kelly ditched alcohol for a month as part of her Lose the Booze campaign.
She took part in this with the Soberistas, a worldwide network of women who have gone sober.
Later, on Lorraine, speaking about her experience, she said she missed booze at the weekend.
She missed it particularly: “After football, especially if you’ve lost. The sun goes down and you just want a wee drink.”
Lorraine has previously spoken of how she used to be a “big lass”, in conversation with fellow ITV presenters Philip Schofield and Holly Willoughby.
She previously credited her new figure to zumba classes with fitness instructor Maxine Jones.
“I really look forward to my classes, and with the new DVD we wanted to show what a class was like.
But while Lorraine’s weight loss is thanks to exercise, she doesn’t believe in diets.
“I don’t think they work, it’s all about portion control,” she said.
“My husband cooks for me and sometimes I ask ‘how many people are coming round?’