Does alcohol make you gain weight?
Short answer: it can — and it's easy to miss. Alcohol is almost as energy-dense as pure fat, it quietly parks your body's fat-burning while it deals with the drinks, and it tends to come with late-night snacks. Here's exactly how drinking drives weight gain, the truth about the "beer belly", and why cutting back is one of the simplest wins for your waistline.
The short answer
Whether alcohol makes you gain weight isn't as clear-cut as the headlines suggest. Australia's Better Health Channel, drawing on a systematic review by the Foundation for Alcohol Research and Education, notes that studies have found positive, negative or no association between drinking and weight — so it's genuinely possible to drink and not gain weight. But there are good reasons drinking often tips the scales the wrong way, and for most people the maths of extra kilojoules is hard to beat.
The Better Health Channel sums it up neatly: alcohol can cause weight gain in four ways — it stops your body burning fat, it's high in kilojoules, it makes you feel hungrier, and it drives cravings for salty, greasy food. Let's take them in turn.
1. Alcohol is loaded with kilojoules
Gram for gram, alcohol is nearly as energy-dense as fat. According to healthdirect, alcohol provides about 29 kJ per gram — compared with 17 kJ for protein and carbohydrate, and 37 kJ for fat. And unlike food, those kilojoules bring essentially no nutrition with them: they're often called "empty" kilojoules for a reason.
A standard drink contains 10 grams of pure alcohol, so that's at least 290 kJ from the alcohol alone — before you count anything else in the glass. Beer and pre-mixed drinks also carry kilojoules from carbohydrates, wine has some too, and sugary mixers pile on more again.
| Drink | Rough energy |
|---|---|
| 1 standard drink (alcohol only) | ~290 kJ |
| Schooner of full-strength beer (~1.5 std drinks) | ~560–600 kJ |
| Standard glass of wine (150 ml) | ~450–500 kJ |
| Spirit with a sugary mixer | ~500–700 kJ |
| A big night — 6 to 8 drinks | ~2,000–2,800 kJ+ |
To put that last row in perspective, a full day's average energy intake for an adult is around 8,700 kJ. A solid night out can quietly add a quarter to a third of a day's kilojoules — on top of everything you've already eaten.
2. It puts fat-burning on hold
This is the part most people don't know. Your body treats alcohol as a toxin and prioritises getting rid of it, so it burns the alcohol off first, ahead of carbohydrate, protein and fat. While that's happening, the fat and carbs from your meal are far more likely to be stored rather than used for energy.
The effect is measurable. A classic study in the New England Journal of Medicine found that adding alcohol to the diet cut whole-body fat burning (lipid oxidation) by around a third. In other words, it's not just the kilojoules in the drink — the drink also changes how your body handles the kilojoules in your food.
3. It makes you hungrier — and less satisfied
Alcohol tends to increase appetite and reduce satiety, the feeling of being full. So you're not only adding the drinks' kilojoules, you're also more likely to eat more than you otherwise would. It's no accident that the classic drinking foods — chips, pizza, salty snacks, greasy late-night takeaway — are exactly what the Better Health Channel lists as the cravings alcohol tends to trigger.
4. The cravings steer you to the worst foods
Those cravings aren't for a salad. Drinking pushes people towards salty, fatty, high-kilojoule food, at a time of night when it's least likely to be burned off. Between the drinks, the extra food and the paused fat-burning, a night of drinking can stack the deck heavily towards storing fat.
Is the "beer belly" real?
Sort of — but it's not really about beer. When there is a link between drinking and body fat, the Better Health Channel notes it's more likely to show up as abdominal fat around the stomach than general weight gain, and more often in men than women. Any alcohol can contribute those extra kilojoules; beer just tends to be drunk in larger volumes, so it gets the blame.
Belly fat is worth taking seriously because fat stored deep around the organs (visceral fat) is metabolically active and linked to higher risks of heart disease, type 2 diabetes and other problems. It's not just an appearance issue.
Will cutting down help you lose weight?
It can — the Better Health Channel says reducing or ceasing alcohol may result in weight loss, though there are many factors at play. Removing a few hundred kilojoules per drink and letting your body burn fat normally again gives you a genuine head start. But it works alongside food and activity, not as a magic switch: if you replace the drinks with equally sugary food, the scales may not budge.
If losing weight is your goal, a few realistic moves make the biggest difference:
- Have more alcohol-free days. Cutting even two or three drinking nights a week removes a surprising number of kilojoules over a month.
- Choose lower-kilojoule drinks. A light beer, a smaller wine, or a spirit with soda water instead of a sugary mixer all cut the energy load.
- Watch the pour. A generous home glass of wine or a schooner is often more than one standard drink — so it's more kilojoules than you think, too.
- Plan the food. Eat a proper meal before you go out so you're less likely to chase salty, greasy snacks later.
- Keep count. People routinely underestimate how much they drink across a week. Seeing the real number — and the kilojoules behind it — makes cutting back far easier.
If you do drink, the Australian guidelines recommend no more than 10 standard drinks a week and no more than 4 on any one day — a sensible ceiling for your weight and your health generally.
Frequently asked questions
Does alcohol make you gain weight?
It can. Alcohol is high in kilojoules (~29 kJ per gram, nearly as much as fat), so one standard drink adds at least 290 kJ before mixers. It also pauses fat-burning while your body clears the alcohol, increases hunger and drives cravings for salty, greasy food. Whether you gain weight depends on how much you drink, what you eat and your overall diet and activity.
How many kilojoules are in a standard drink?
A standard drink has 10 grams of pure alcohol, and alcohol provides about 29 kJ per gram — so roughly 290 kJ from the alcohol alone. Beer, wine, pre-mixes and sugary mixers add more on top, so a real drink is usually well above 290 kJ.
Is a beer belly real?
The extra kilojoules can be stored as fat, and where there's a link it tends to be abdominal fat, especially in men. It's not caused by beer specifically — any alcohol, plus the food that comes with it, can contribute. Total kilojoules in versus out still matters most.
Will I lose weight if I stop drinking?
Cutting down or stopping can lead to weight loss, but it's not guaranteed — it depends on what you replace the drinks with and your overall diet and activity. It removes the drinks' kilojoules and lets fat-burning return to normal, giving you a head start, but it works with food and exercise, not instead of them.
Does alcohol stop you burning fat?
Yes, temporarily. Your body burns alcohol off first, pushing fat-burning to the back of the queue until the alcohol clears. Research shows adding alcohol to the diet can cut fat-burning by around a third during that window, so the fat and carbs you've eaten are more likely to be stored.
Sources: Better Health Channel — Alcohol and weight gain, healthdirect — Kilojoules, New England Journal of Medicine (1992) — The effect of ethanol on fat storage in healthy subjects, and Diabetes Australia — Alcohol, weight and diabetes. This article is general information, not medical advice — see your doctor about your own health, and if you're worried about your drinking you can call the National Alcohol and Other Drug Hotline on 1800 250 015.