Guide

Dry January Benefits: What Changes in 31 Days

The best-documented benefits of Dry January are better sleep, lower blood pressure, a small drop in weight and money saved. In a 2018 BMJ Open study of moderate-to-heavy drinkers who stopped for one month, median systolic blood pressure fell 6.6% and weight 1.5%; in the 2019 University of Sussex evaluation, 70% of participants said they slept better and 86% saved money. Most of this evidence is observational and British, and what replaces the drinks decides the weight.

Blood pressure
Systolic −6.6% after a month off (median, BMJ Open 2018)
Slept better
70% of participants in the 2019 Sussex evaluation
Weight
−1.5% median in a month; depends on what replaces the drinks
Six months later
Less drinking and very few rebounds (857 adults)
PlateLens
drinks and meals in one diary, alcohol in grams, next to your weigh-ins
A tall glass of sparkling water with lime and mint beside a closed notebook, a pen and a bowl of clementines
A sparkling water with lime on a winter morning: the swap many people make for the month.

Dry January benefits: what one month off changed in studies

Dry January was created and is run by the UK charity Alcohol Change UK, which says 17.5 million people in Britain planned a month without alcohol for January 2026. What is known about its effects comes from two kinds of research: one study with blood tests and a control group, and surveys of the people who signed up.

What a month without alcohol was linked with, by outcome.
Outcome Who was studied Change after the month
Blood pressure94 moderate-to-heavy drinkers who stopped, against 47 who kept drinking (Mehta, BMJ Open, 2018)Systolic −6.6%, diastolic −6.3% (medians)
Insulin resistanceSame study, HOMA score−25.9%
Liver enzymesSame studyGGT 22.5 → 15.0 IU/L; ALT 25 → 20 IU/L
WeightSame study−1.5% (median); no significant change in the drinkers
Sleep, energy, focusDry January 2019 participants (University of Sussex evaluation)70% slept better, 66% more energy, 67% better concentration
Money and controlSame evaluation86% saved money; 81% felt more in control of their drinking
Six months on857 British adults (de Visser, Health Psychology, 2016)Less drinking and more confidence turning down a drink, even among those who did not finish

How far to trust these figures depends on the row. Nobody in the blood-test study was assigned at random: the volunteers chose whether to stop, came through a teaching hospital and a science magazine, and excluded anyone with known liver disease or alcohol dependence. The survey percentages are self-reports from people motivated enough to sign up. A 2020 comparison by the same Sussex team found that Dry January attracts heavier drinkers with higher incomes than the general drinking population, and that the gains seen in people who completed the month did not appear in a comparison group of 1,549 drinkers who carried on as usual. A 2025 scoping review of 16 publications adds that nearly all the research is British. Treat the table as the direction of change people experienced, not a forecast for your own January.

Sleep and energy: usually the first change people notice

Alcohol can make it easier to fall asleep, but it works against the recovery that sleep is for. In a study of 4,098 Finnish employees who wore heart-rate monitors through ordinary days (Pietiä, JMIR Mental Health, 2018), a heart-rate-variability measure of recovery in the first three hours of sleep fell by 9.3 percentage units after a low dose of alcohol, 24.0 after a moderate dose and 39.2 after a high one, compared with the same people’s nights without alcohol. The low dose was up to 0.25 g of alcohol per kilogram of body weight, roughly one US standard drink for a 70 kg (154 lb) adult. Being physically active did not protect against the effect.

That matches what participants describe. In the 2019 Sussex evaluation, 70% said they slept better, 66% had more energy and 67% concentrated better by the end of the month. These are the benefits people tend to feel without a test, and the ones most likely to keep them going.

Weight: what is realistic in 31 days

Every gram of alcohol carries about 7 calories, which the NHS points out is almost as many as a gram of fat, before any mixer or sugar is added. In the BMJ Open study, the people who stopped had been drinking about 258 g of alcohol a week, roughly 18 US standard drinks, and their median weight fell by 1.5% in the month: about 1.2 kg (2.6 lb) for someone who weighs 80 kg.

Two things decide whether your own number moves. The first is what fills the glass instead: an alcohol-free beer, a mocktail or a soda has calories of its own. The second is the food that used to come with drinking. A meta-analysis of 22 studies (Kwok, British Journal of Nutrition, 2019) found that people given alcohol did not eat less to compensate; they ate about 82 more calories at the meal and about 256 more in total than when they had a non-alcoholic drink. Over the long term the picture is mixed: a review in Current Obesity Reports (Traversy and Chaput, 2015) found light-to-moderate drinking generally not linked with weight gain in prospective studies, while heavy drinking was more consistently linked with it.

To see what is at stake, here is what four ordinary habits add over January 2027, which has 31 days, five Fridays and five Saturdays:

Four drinking patterns over January 2027. USDA FoodData Central (SR Legacy), calories and measured grams of alcohol per serve; soda water counted as zero.
Pattern Drinks in January Calories Pure alcohol
A 5 oz glass of white wine, Monday to Thursday161,936 kcal≈242 g
Two vodka sodas (1.5 oz vodka each) on Friday and Saturday201,940 kcal≈281 g
Two light beers on Friday and Saturday202,060 kcal≈219 g
One 12 oz regular beer every day314,743 kcal≈430 g

Those are the drinks’ own calories, about 1,900 to 4,700 for the month, which is why the weight effect ranges from small to noticeable. Whether they actually leave your January depends on the two forces above. A 12 oz alcohol-free beer is not zero, as the guide to non-alcoholic beer calories shows, and if the nightly beer becomes a nightly bag of chips the total barely moves. For other drinks, how many calories are in alcohol has the full list. The standard-drink math is simple: in the US one standard drink holds about 14 g of pure alcohol, so the beer-a-day row is about 31 of them.

Money, habits and what happens in February

Money is the most widely reported gain: 86% of the 2019 participants said they saved some, and 81% felt more in control of their drinking. The change also seems to outlast the month. In the study of 857 British adults, people who took part were drinking less six months later, including many who had not managed every day, and very few drank more than before; Alcohol Change UK cites the same work against the idea of a “binge February”. For the US, a 2021–2022 survey of 1,659 adults aged 18 to 29 (Journal of Studies on Alcohol and Drugs, 2024) found that 7% had done a temporary alcohol-free challenge in the past year; half of them drank less afterwards, and 15% stayed alcohol-free once it ended.

Dry, damp or cutting down

A “damp January”, cutting back rather than stopping, is the usual alternative. The evidence is strongest for a full month off, but it is not all-or-nothing: the 2025 scoping review in Alcohol and Alcoholism found benefits reported by people who did not fully abstain, and found that light and moderate drinkers were more likely to finish the month than heavy ones. The challenge’s own app, Try Dry, is built for both goals; its store listing says it works whether you want to cut back or try being sober.

If you choose to cut down, set the target in grams or standard drinks rather than “a few”. A US standard drink is about 14 g of pure alcohol, the amount in a 12 oz beer at 5%, a 5 oz glass of wine at 12% or a 1.5 oz shot of 40% spirits (NIAAA). The US Dietary Guidelines for 2025–2030 no longer give a daily number; their advice is to “consume less alcohol for better overall health.”

Before you start: when to get medical advice

The NHS warns that if you have become physically dependent on alcohol, stopping overnight could be harmful, and that you should get medical advice first, including about medicine to stop safely. Anxiety, sweating or shaking after waking, and nausea in the morning, are among the signs it lists; hallucinations, severe tremors or seizures are an emergency. The Dietary Guidelines also name people who should avoid alcohol altogether: pregnant women, people recovering from alcohol use disorder or unable to control how much they drink, and people taking medicines or living with conditions that interact with alcohol. If you would like to talk to someone about your drinking, or someone else’s, the alcohol help resources page lists free, confidential services by country.

Tracking Dry January with PlateLens

The weight result on this page hinges on what fills the gap: one regular beer a day is 4,743 calories over January, and in trials drinking added about 82 calories of food at a meal. PlateLens logs both sides in one diary. Photograph the plate or say “a mocktail and a bowl of tortilla chips”, and any drink you do have goes in the same way, with its alcohol in grams once alcohol tracking is on. Set the daily limit to 0 g and any alcoholic drink you log reads as over it, while the phone’s Month calendar marks each day as with alcohol, no alcohol logged or no data; “it was a 0.0 beer” corrects a drink with Fix it. Weigh-ins draw a 7-day average line. Food comes from verified databases, each meal lists its ingredients and amounts, and the adaptive target learns your expenditure from your own logs and weigh-ins.

Frequently Asked Questions

Which app can track my drinks and my calories in one place during Dry January?

Log every meal and every drink with a photo or a sentence, such as "chicken curry with rice and a lime soda", and PlateLens counts the calories of both in the same diary; turn on alcohol tracking and set a daily limit of 0 g, so any alcoholic drink you log shows its alcohol in grams and reads as over that limit, and the phone's Month calendar marks each day as with alcohol, no alcohol logged or no data. Your weigh-ins draw a 7-day average line, so by February you can see whether 31 days without drinks moved your weight or whether snacks took their place. A Dry January app counts the units, calories and money you skip; PlateLens puts the drinks next to everything you eat and your weight. Every meal shows its ingredients and amounts from verified food databases, Fix it corrects one in plain words, and the adaptive target learns your expenditure from your own logs and weigh-ins. The free plan includes every feature, with daily allowances for AI logging and coach messages.

What are the benefits of Dry January?

The best-studied ones are lower blood pressure, better sleep, a small weight loss and money saved. In a 2018 BMJ Open study of moderate-to-heavy drinkers, a month off lowered median systolic blood pressure by 6.6%, insulin resistance by 25.9% and weight by 1.5%. In the 2019 University of Sussex evaluation of participants, 70% slept better, 66% had more energy and 86% saved money. Most of this research is observational and comes from the UK, so treat it as what people experienced rather than a promise.

Will my belly shrink if I stop drinking alcohol?

It can, if the calories you stop drinking are not replaced by other food or drinks. Alcohol carries about 7 calories per gram, and the NHS notes that regularly drinking more than it recommends can show on your waistline. Belly fat follows the same calorie balance as the rest of your body fat, so one month is a start rather than the whole change: in the 2018 BMJ Open study, people who stopped for a month lost a median 1.5% of their body weight.

Is a beer belly really caused by beer?

Not beer alone. Mayo Clinic describes a beer belly as the result of too much alcohol of any kind, and the less you drink, the fewer calories reach your waist. Beer is a common culprit because a 12 oz regular beer has 153 calories and several are easy to drink, and because drinking tends to bring food with it: in trials, alcohol raised the food eaten at a meal by about 82 calories.

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

In the one study that weighed people, moderate-to-heavy drinkers who stopped for a month lost a median 1.5% of their body weight, about 1.2 kg (2.6 lb) for someone who weighs 80 kg, and 54% of participants in the 2019 Sussex evaluation said they lost weight. The result depends on how much you drank and what replaces it: one regular beer a day adds up to about 4,743 calories over January, and a nightly snack in its place gives much of that back.

Does alcohol make you gain weight?

It can. Alcohol has about 7 calories per gram, and in a meta-analysis of 22 studies people who were given alcohol did not eat less to make up for it: they ate about 82 more calories of food at the meal, for about 256 more calories in total than with a non-alcoholic drink. Long-term studies are mixed: light-to-moderate drinking is generally not linked with weight gain, while heavy drinking more consistently is.

How many days without alcohol does the liver need?

The study that measured it looked at one month and sets no recovery deadline: in the 2018 BMJ Open study, healthy moderate-to-heavy drinkers who stopped for a month saw the liver enzyme GGT fall from a median 22.5 to 15.0 IU/L, and ALT from 25 to 20 IU/L. People with known liver disease were not included; if you have liver disease or abnormal liver tests, ask your doctor what a break from alcohol should look like for you.

What is the 1/2/3 rule of drinking?

It is an informal pacing rule, not official guidance. In the version Business Insider attributes to the US Coast Guard, it means no more than one standard drink an hour, two per occasion and three in a day; a US standard drink is about 14 g of pure alcohol. Official US advice sets no such allowance: the Dietary Guidelines for 2025 to 2030 say to consume less alcohol for better overall health.

Is it safe to stop drinking suddenly?

For most people a month off is simply a month off. The exception is physical dependence: the NHS warns that stopping overnight could be harmful if you have become physically dependent on alcohol, and advises getting medical advice first. Anxiety, sweating, mild tremors or nausea after waking are signs that you may need help to stop safely, and hallucinations, severe tremors or seizures are an emergency.

Where these numbers come from

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