Blog · Published 6 October 2026 · By Sober Counter · How we write these posts

Weight loss after quitting alcohol: how much, and how fast

Do you lose weight when you stop drinking? The calories in alcohol, what a study measured after one month, why some people gain weight instead, and what helps.

Quick answer

Most people who stop drinking lose some weight, because alcohol has 7 calories per gram and drinking days tend to bring extra food too. In a 2018 study of 94 moderate to heavy drinkers, typical weight fell by 1.5% (from 81.1 kg to 79.5 kg) after one month without alcohol, without other changes to diet or exercise. How much you lose depends on how much you drank and what replaces it: some people eat more sugar in the first weeks and lose less, or gain.

Why alcohol adds weight

The drinks themselves. The NHS says alcohol contains "7 calories per gram, which is almost as many as a gram of fat". A standard 175ml glass of 12% wine has up to 158 calories, and a pint of 5% beer up to 222. For adults who drink regularly, the UK charity Drinkaware estimates that nearly 9% of their daily calories come from alcohol.

The food that comes with them. A US study compared what 1,864 drinkers ate on a day they drank with a day they did not. On drinking days, men ate 168 more calories of food, with more meat, potatoes and added fat and less fruit. Women did not eat more calories, but they ate more fat. The authors' summary: these mostly moderate drinkers "had poorer diets on drinking days".

Appetite and willpower. Drinkaware explains that drinking "affects the hormones that control your appetite", and makes you less inhibited, so less likely to make healthy choices. Late-night food after a few drinks is not a lack of character.

How your body handles fat. Because alcohol is toxic, your body prioritises getting rid of it, and Drinkaware says this affects the way it processes fat for energy.

How much weight can you lose?

It depends almost entirely on how much you drank. Take the NHS figures:

Four pints of 5% beer on a Friday night: up to 888 calories.
A glass of wine with dinner every evening: up to 1,106 calories a week.
Half a bottle of wine a night (375ml): over 2,000 calories a week.

For comparison, the NHS says an average woman needs about 2,000 calories a day and an average man about 2,500. The NHS also puts it simply: you are likely to lose weight if you eat and drink fewer calories than you use. Stopping drinking removes those calories, plus, for many people, the extra food that came with drinking days.

What it does not do is guarantee a number on the scale. If the calories come back as dessert, fizzy drinks or takeaways, the loss shrinks or disappears.

How fast does the weight come off?

The best measurement comes from a 2018 study in BMJ Open. Researchers in London followed 94 healthy moderate to heavy drinkers who chose to stop for a month, and 47 who kept drinking. The group who stopped had been drinking about 32 UK units a week.

After one month, their typical weight had fallen by 1.5%, from 81.1 kg to 79.5 kg. Their exercise had not changed and their diet barely had, and the authors found the weight loss was independent of other lifestyle changes. The people who kept drinking showed no significant change. Their blood pressure and blood sugar control improved too, which our page on 30 days without alcohol covers.

Two limits: people chose which group to join rather than being randomly assigned, and they were probably more motivated about their health than most.

A larger, self-reported picture comes from the University of Sussex, which surveyed people who did Dry January in 2018. Of the 816 who answered the final survey, 58% said they had lost weight.

No study tracks weight week by week after people stop, so treat any "week 1, week 2" chart with caution. A fair expectation: a little weight in the first month, more over the following months if the calories you used to drink are not replaced.

Why some people gain weight after quitting

If you stopped drinking and the scale went up, you are not alone, and there is a common reason: sugar.

A small 2021 study followed 26 people in early recovery from alcohol problems and found their sugar intake rose over the first four weeks after treatment. Many people notice the same thing: a pull towards sweets, chocolate or sugary drinks, often at the time of day they used to drink.

That study was small and did not measure weight, so it cannot say how many people gain. But if your evening wine has turned into an evening packet of biscuits, that is the likely reason the weight is not moving.

Two things worth knowing:

Not drinking matters more than not gaining. In the first weeks, if something sweet helps you get through a craving, it is a fair trade. You can sort out the biscuits later.
Sleep often gets worse before it gets better after quitting, and tiredness makes snacking harder to resist. Our guide to insomnia after quitting alcohol covers what helps.

What helps the weight come off

Count what you no longer drink. Write down what you used to drink in a normal week and multiply it by the calories above. It is easier to stay on track when you can see the number.

Watch what replaces the drinks. Soft drinks, mixers and some alcohol-free drinks can have a lot of sugar, so check the label. Water, sparkling water and sugar-free drinks are the safe bets.

Plan for the old drinking hour. If 6pm was wine time, have something ready for 6pm: a walk, a call, a meal, a drink you like that is not sugary.

Eat regular meals, so you do not face the old drinking hour hungry.

Give it a month. In the BMJ Open study, the change after a month was small on the scale. The bigger changes, in blood pressure and blood sugar, were invisible. Keep going even if the scale is slow.

When to see a doctor

If you drink heavily every day, speak to a doctor or a local alcohol service before you stop. Stopping suddenly when you are dependent on alcohol can be dangerous.

See a GP if you keep losing weight without trying, month after month, beyond what cutting out drinks would explain, or if you have also lost your appetite or feel sick. The NHS lists losing weight without trying among the early signs of cirrhosis, the scarring of the liver that heavy drinking can cause.

Get help the same day (NHS 111 or an urgent GP appointment in the UK) if your tummy, legs, ankles or feet are swelling, or if your skin or the whites of your eyes turn yellow.

Call 999 or go to A&E (or your local emergency number) if you vomit blood or your poo is very dark or black.

Questions

Do you lose weight when you stop drinking alcohol?

Most people do, because alcohol has 7 calories per gram and drinking days often come with extra food. In a University of Sussex survey, 58% of people who did Dry January said they had lost weight. How much depends on how much you drank and what you eat and drink instead.

How much weight can you lose in a month without alcohol?

In a 2018 study of 94 moderate to heavy drinkers, typical weight fell by 1.5% after a month off, from 81.1 kg to 79.5 kg, without other changes to diet or exercise. People who drank more to begin with have more calories to lose.

When does weight loss start after quitting alcohol?

The calories stop from your first alcohol-free day. On the scale, the BMJ Open study saw a small drop after one month. No study has measured it week by week.

Why am I gaining weight after quitting alcohol?

Usually because the calories have moved rather than gone: sugar cravings are common in early sobriety, and a small study found sugar intake rose in the first four weeks. It is fine to lean on sweets for a while if they help you stay off alcohol, then swap them for less sugary options.

Sources

Need support right now?

In the UK, the NHS lists free alcohol support services: NHS alcohol support. In the US, the SAMHSA National Helpline is free, confidential and open all day, every day. Elsewhere, your local health service can point you to help near you.

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