That's the same as 12 Big Macs!
Food historian Dr Annie Gray carried out the research for AB Sugar - a sugar producer - and found that we'll scoff more than twice the amount that we expect to.
Interestingly, it also found that traditional turkey isn't quite as popular, as only half of those asked said they'd be tucking into the meat on Christmas Day.
Instead, 17 per cent would be opting for beef or chicken, while seven per cent will be serving lamb.
The study also found that Christmas puddings are no longer loved by the younger generation. Less than a third of 18 to 24 year olds will delve into the festive dessert, as opposed to 61 per cent of those aged 55 and over.
And it's not just the food that's contributing to the calories - booze is also a big factor.
A third of us will enjoy red or white wine with our yuletide meal, while a quarter will sip on the sparkling stuff and a fifth will even choose beer or lager.
That is definitely food for thought!
Speaking about the research, Annie explained: "Our food, drink and even lifestyle habits have really changed over the years."
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