Christmas calories: plan the week, not the day

By My Calorie Pal · 12 November 2026

Christmas Day is the one day of the year when a daily calorie target is sure to fail, and that's fine. Your weight follows your balance across the week, so the aim isn't to survive the day. It's to plan a week with room for it, so the big day doesn't turn into a pound that stays.

What a Christmas Day adds up to

Figures of 6,000 kcal or more appear in the papers every December. Built up from fairly ordinary portions, a full day with drinks and snacks looks more like this:

That's roughly twice what most adults burn in a day. Yours could be a fair bit higher or lower, but the shape is usually the same: Christmas dinner itself, pudding included, is 1,890 kcal, well under half the day. The drinks and the grazing around it (chocolates, crisps, the mince pie and the cheeseboard) come to 2,160, more than the dinner.

How big a hit is it?

If you burn 2,100 kcal a day, that Christmas Day is 2,400 kcal over. With roughly 7,700 kcal in a kilogram of body fat, that's about 0.3 kg (two thirds of a pound) if nothing else in the week balanced it. The scale on Boxing Day will probably show more than that, but most of the jump is salt, water and food still on its way through, and it fades within a few days. Why the scale lies explains why.

So one day isn't the problem. The trouble is that Christmas tends to be a week or two of them, and what's gained doesn't come off by itself. In a well-known American study that weighed 195 adults through the winter holidays, the average gain was only 0.37 kg, far less than people believed. But it was still there the following autumn. A small gain each year that never comes off is how a lot of adult weight gain happens.

Plan the week, not the day

Here's the same Christmas Day inside a week. With maintenance of 2,100 kcal, the week's break-even total is 14,700 kcal. Take off 4,500 for Christmas Day and the other six days get 1,700 each, just 400 under maintenance: an ordinary day of eating, not a hungry one. The week ends level, and the big day costs nothing.

You can plan your own in the weekly calorie budget planner:

1. Enter your maintenance calories. If you don't know them, the TDEE calculator gives an estimate.
2. Choose Maintain for Christmas week.
3. Type your estimate for Christmas Day on whichever day it falls. The other six days share what's left.

Why maintain rather than lose? If you kept a usual 500 kcal a day deficit, the week's budget would be 11,200 kcal, leaving only about 1,120 for each of the other six days. That's under the 1,200 the planner warns about, and low enough to make you very hungry for the big day. Holding your weight over Christmas is a good result. Go back to your usual deficit on the first normal day after.

Trim the day without missing the dinner

Since most of the day's calories aren't in the dinner, you don't need to touch the dinner. A few changes around it make a real difference:

• Halve the grazing. Five chocolates instead of ten saves 220 kcal. Put the tin away between rounds instead of leaving it open beside you.
• Pace the drinks. Two glasses of wine rather than four saves 320 kcal. Alternate with water or a low alcohol drink, or make a spritzer.
• Make the cheeseboard optional. Half a plate at the end of the day saves about 210 kcal, and many people only eat it because it's there.
• Don't skip breakfast to save up. Arriving at dinner starving is the surest way to eat far past what you planned.

Those three changes take the day from 4,500 to 3,750 kcal, and the other six days in the planner go up to 1,825 each.

What stopped Christmas weight gain in a trial

In 2018, researchers at the Universities of Birmingham and Loughborough ran a Christmas trial with 272 adults. Half were asked to weigh themselves regularly and write it down, given ten tips for managing weight, and shown how much walking or running it would take to burn off common festive foods and drinks. The other half got a healthy living leaflet.

Over Christmas the leaflet group gained 0.37 kg on average, while the weighing group lost 0.13 kg. None of it was a diet. It was simply paying attention: knowing what things cost, and seeing your weight often enough to notice a trend before it settles in.

Logging your days does much the same job. If you weigh yourself over Christmas, expect a jump the morning after a big day, and judge it by the trend over a week or two rather than one reading.

Christmas Eve, Boxing Day and the week after

For many people Christmas Day isn't the only big day. If Christmas Eve and Boxing Day are big too, there isn't room to absorb all three in one week without some very low days. Don't try. Plan the days you can, keep the rest to ordinary meals, and accept that the week may end a little over.

If you have an account, My Calorie Pal deals with that for you. A week that ends over carries into the next one as a small figure to burn off, spread across seven days and kept apart from that week's own target. It only carries once, so Christmas can't turn into a debt that follows you through January. A week of 1,300 kcal over carries as under 200 kcal a day.

What it won't do is ask you to make up for Christmas with a crash diet in the new year. Pick up your normal deficit, and let the weekly total take care of the rest.

Logging it in the tracker

Log Christmas Day on the week page even if it's only a rough guess. A round 4,500 is far more useful than a blank, because the week total and carry-over can only balance what they can see. If you're cooking, the meal calculator can work out a plate of your own Christmas dinner from the ingredients.

And if Christmas food leaves you anxious, or you find yourself eating very little to make up for eating a lot, please talk to your GP. The eating disorder charity Beat has support for adults too.

Sources

1. NHS. Calories in alcohol.
2. Yanovski JA, Yanovski SZ, Sovik KN, et al. A prospective study of holiday weight gain. New England Journal of Medicine, 2000; 342(12): 861–867.
3. Mason F, Farley A, Pallan M, et al. Effectiveness of a brief behavioural intervention to prevent weight gain over the Christmas holiday period: randomised controlled trial. BMJ, 2018; 363: k4867.
4. Hall KD, Sacks G, Chandramohan D, et al. Quantification of the effect of energy imbalance on bodyweight. The Lancet, 2011; 378(9793): 826–837.
5. Beat. Get help for myself.

This guide is general information, not medical advice. If you have a health condition, are pregnant, or have a history of disordered eating, talk to your GP or a registered dietitian before changing how you eat.