But the Good Morning Britain presenter has promised to spectacularly fall off the wagon - live on air!
The 48-year-old TV presenter says she will get "absolutely hammered" if her and controversial co-host Piers Morgan wins a National Television Award later this month.
Discussing the nomination for Best Daytime Show with Piers, Susanna said: "That night, if we win, I will drink."
Piers replied: "This is great, if you vote for us, and we win, Susanna Reid will break her alcohol-free [diet] - which has now been going on for about six months.
"And trust me, when she is drunk she is a live one."
You got my vote. Drunk or sober!
She said: "I will get absolutely hammered."
Piers then asked: "Will you come here and present the show drunk?"
When Susanna answered with a definitive yes, Piers cheered and applauded the comment.
He declared: "Susanna Reid will come in her evening attire, fresh from the NTA after-party, if we win, and present the show drunk.
"I am normally half-drunk anyway so it makes no difference to me but she doesn't drink."
Susanna added: "I will be 99 per cent alcohol."
The 'Life Stories' host earlier threatened viewers that he will strip naked and dance on the show if the ITV news and talk show loses in the category.
He said: "I will wear my birthday suit, in all its glory, if we lose.
"I will strip naked and do a conga only if we lose." But he then cut himself short, and quipped: "I'm not going to say that because we will lose."
Viewers were amused by the TV star's vow, with one tweeting: "@susannareid100 presenting drunk the morning after will be priceless TV."
Another said: "All vote for GMB now!!!" While a third commented: "You got my vote. Drunk or sober." A fourth added simply: "That should be fun!"
One disapproving tweet read: "Is that something to be proud of?" Another commented: "@susannareid100 will get drunk and present whilst [bleeped] up.....whoop de do 🙄
Begging for votes is cringe, have some self respect you lot."
The nominees for the National Television Awards 2019 were announced on Monday, with Good Morning Britain up for Best Daytime Show alongside Loose Women, Sunday Brunch, The Jeremy Kyle Show and This Morning.
The NTAs will take place on 22 January at London's O2 Arena.
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