The Good Morning Britain host, who is dating Crystal Palace boss Steve Parish, shed a stone and a half in body fat when she waved goodbye to "vodka shots" and "nice white wine" last summer.
Carrying excess weight, even if it's just a little, has been linked to type 2 diabetes, stroke, heart disease and cancer and Susanna says she was warned of the risks by doctors.
She explained to Mail on Sunday's Femail:: "I love it. I used to love drinking — nice white wine, bubbles, prosecco.
"I used to love doing vodka shots last thing at night in the Groucho. I love margaritas.
"The only thing I didn’t like was red wine."
Susanna, 48, also cut snacks from her diet and now orders a small pot of peanut butter, a sliced apple and a lot of coffee before she hosts GMB with Piers Morgan at 6am.
She eats a low-carb lunch around 9.30am before sleeping for two hours and the telly beauty added: "I do barely any exercise — the gym once every six weeks, maybe."
The star used to love boozy nights out and trips to Ibiza with pal Judge Rinder, but she now prefers to join boyfriend Steve, 54, at the football.
However, Piers is not a fan of her booze-free lifestyle.
She went on: "(Booze) adds the weight on.
"It wasn’t good for my skin and it’s not great for your memory and I just wasn’t willing to pay the price any more."
Speaking about how Piers has handled her lifestyle change, the star added: "He’s constantly, 'Oh, you’re no fun.
"Why don’t you just have a glass of wine, no-one will know.'"
Meanwhile, Susanna revealed she has no plans to marry Steve and it was never her "ambition" to get married.
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