The guide

Alcohol and weight loss, beyond the calories

By GyroscopeUpdated November 15, 20269 sources

Alcohol gets in the way of weight loss in three ways, and the calories are only one. While your liver clears it, fat burning nearly stops. A drink before dinner makes you eat more, and the broken sleep afterward makes you hungrier the next day. If you’re trying to lose weight, cutting drinks often does more than the calorie count suggests.

Most people who drink and diet do the math on the calories. A glass of wine is about 125, a beer about 150, so two drinks a few nights a week looks like a small cost to budget for. It’s a fair start. But it misses what alcohol does to the rest of what you eat, and to how your body handles it.

1. Fat burning stops while alcohol clears

Your body can’t store alcohol, so it burns it first and puts everything else on hold. In a 1999 study, 8 healthy men drank 24 g of alcohol, a little less than two US drinks. Less than 5% of it turned into fat. But fat burning across their whole body fell 73%, and the release of fat from their fat stores fell 53%. One standard drink takes most adults about 2 to 3.5 hours to clear, so an evening of drinking pauses fat burning for much of the night.

The fat you eat with the drinks, the cheese, the fries, the late snack, is more likely to end up stored. bodyfat.guide has more on where it goes.

2. You eat more that night

This is the aperitif effect, and it’s been measured. In a 2015 study, 35 women got an alcohol drip or a salt-water drip in a brain scanner, then sat down to a pasta meal. After the alcohol, the part of the brain that handles hunger lit up more at the smell of food, and they ate more. A 2010 review found the calories from alcohol add to what people eat rather than replacing it, and a drink before or with a meal tends to increase how much food goes with it.

200 calories of beer against 200 calories of food breaks down why the same calories land so differently.

3. The next day, you’re hungrier

Alcohol breaks up the second half of the night and cuts REM sleep, even at about two drinks. Short sleep changes your hunger hormones. In a 2004 study, 12 young men had their sleep cut short for two nights and then extended for two. After the short nights they had 28% more of the hunger hormone ghrelin, 18% less of the fullness hormone leptin, and 24% more hunger. Their appetite for calorie-dense, carb-heavy food went up 33 to 45%. That’s the morning-after craving for a breakfast sandwich and hash browns.

Does drinking make people heavier?

The studies are mixed for light drinkers and clearer for heavy ones. A 2015 review found that light to moderate drinking wasn’t consistently linked to gaining fat, while heavy drinking was. One reason is that the light drinkers in those studies tend to have healthier habits overall. For someone actively trying to lose weight, the mechanisms above matter more than the population average.

And stopping shows up on the scale. In 94 moderate to heavy drinkers who took a dry month, weight fell 1.5%, a change the researchers couldn’t explain by diet or exercise, and a group that kept drinking saw no change.

The calories, for the record

Alcohol carries about 7 calories a gram, almost as much as fat. NIAAA’s calorie calculator lists a 12 oz regular beer at 153, a light beer at 103, a 5 oz glass of red wine at 125, a 4 oz margarita at 168 and a 9 oz piña colada at 490. How many calories are in a drink? has more, and tdee.guide works out how many calories you burn in a day, so you can see what a week of drinks is in your budget.

On a weight loss drug?

If you take a GLP-1 drug like Ozempic or Wegovy, tell your prescriber what you drink. Can you drink on Ozempic? has what’s known and what hasn’t been tested.