According to a poll of 1,000 people, by diet company Forza Supplements, the average person puts on 4lbs between Christmas Eve and New Year's Day thanks to a whole week of consuming twice the recommended calorie intake.
And 34 per cent of respondents said it would take four months to shift the extra weight... just in time for Easter!
A huge majority of 94 per cent indulged in rich food and fine wine for the festive period, and though 18 per cent return to their day-to-day eating regime on 27 December, 44 per cent let themselves go throughout Christmas and New Year. For 32 per cent, the festive eating begins at the start of December.
That left 39 per cent carrying an extra three to five pounds, 21 per cent between five and seven pounds, and, for five per cent, the festive season left them more than half a stone heavier.
Lee Smith, managing director of Forza Supplements, told the Daily Mail: "We all want to let our hair down at Christmas and enjoy ourselves. But it can take months to repair the damage if you really let yourself go."
He added: "The key to limiting your weight gain is to do simple things like eat slowly and avoid over-filling, and make sure you take some exercise."
Do you watch your weight during the festive season, or do you really let go for Christmas? Leave your comments below...