The calories, in pints and glasses
Alcohol carries 7 calories per gram, between carbs and fat, and none of it does anything useful for you. Rough Irish numbers: a pint of stout or lager is around 180–220 calories, a 175ml glass of wine about 160, a gin and slimline tonic about 60.
Six pints is 1,200 calories before you have eaten anything. That is most of a day's food for a lot of people, which is why a couple of sessions a week can hold someone at the same weight for months while they swear they are eating well.
The real damage is what happens next
Drink lowers inhibition around food, and there is a reason the chipper is beside the pub. The pints are 1,200 calories; the 3am food is another 1,000. Then the next day you feel wrecked, you eat for comfort, you skip the gym and the walk, and a two-day hole appears in the week.
That pattern — not the alcohol itself — is what stalls most people. Five good days and two mad ones nets zero, and it feels like a metabolism problem when it is arithmetic.
What it does to training and sleep
A heavy night measurably blunts muscle protein synthesis and dents strength and coordination for a day or two. It also wrecks sleep quality even when you are unconscious for eight hours, and short sleep shifts appetite hormones towards wanting more food and more sugar.
So the cost is not just the calories: it is a worse session, a hungrier day, and less recovery from the training you did manage.
How to drink and still make progress
Nothing here says stop drinking. It says count it and contain it:
- Log it before you go out, not the morning after. Six pints logged in advance changes what you order.
- Eat protein before you drink. Arriving hungry is what causes the 3am food, not the drink itself.
- Decide about the takeaway while sober. That decision is worth more than the drink choice.
- Protect the next day. Get your steps and your protein in even if training is a write-off. One bad day beats a bad weekend.
What not to bother with
There is no supplement, detox drink or gym session that undoes a night out. “Sweating it out” is not a mechanism. The only lever is how often it happens and what you eat around it.
If weekends are where your week dies, the Fat Loss Basics guide covers the budgeting side properly, and the free tracker will happily log a pint.
Frequently Asked Questions
Does alcohol stop fat loss?
No. It adds calories and makes the surrounding hours harder to control. Fat loss still comes down to the weekly calorie total, and drink is simply an expensive part of it.
How many calories in a pint?
Roughly 180–220 for a standard Irish pint of lager or stout, depending on strength. Six pints is about 1,200 calories, before anything you eat afterwards.
What is the best drink if I'm cutting?
Spirits with a zero-calorie mixer, around 60–70 calories a measure. Beer and cocktails are the most expensive per unit of enjoyment, if you are counting.
Should I eat less during the day if I'm drinking that night?
Budgeting some calories for the evening works well. Skipping food entirely does not — you arrive hungry, drink faster on an empty stomach, and eat more later. Keep protein high during the day.
How long does alcohol affect muscle growth?
A heavy session blunts recovery for roughly 24–48 hours. A couple of drinks with dinner is not meaningfully different from none.
About the author
Keith O’Beirne went from 90kg to 72kg around a full-time job and two kids, after paying a personal trainer to learn the basics. He is not a doctor, dietitian or coach and does not sell coaching — he writes No Nonsense Fitness to give away what he paid to learn, free, with no ads, no subscriptions and no commission on any link. Based in Dublin.
References & further reading
- Parr EB et al. Alcohol ingestion impairs maximal post-exercise rates of myofibrillar protein synthesis following a single bout of concurrent training. PLOS ONE, 2014.
- Ebrahim IO et al. Alcohol and sleep I: effects on normal sleep. Alcoholism: Clinical and Experimental Research, 2013.
- Yeomans MR. Alcohol, appetite and energy balance: is alcohol intake a risk factor for obesity? Physiology & Behavior, 2010.
Figures on this page come from product labels and the research above. How we calculate every number is set out in our methodology.
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