Does Alcohol Kill Your Gains? A Science-Based Guide for Lifters

Alcohol and muscle growth don’t mix, or so they say. But it is possible to build muscle and still enjoy a drink, as long as you don’t go overboard.

In this article, I’ll uncork the science, explore the myths, and serve up practical tips to balance happy hour with your quest for muscle gain.

The sobering truth is that your biceps aren’t fans of happy hour, but you can strike a sensible balance between your fitness goals and your social life, and you can have your beer and build muscle, too.

Alcohol: Friend or Foe to Your Muscle Gains?

Can you build muscle while still enjoying a drink?

It’s not the most common question I get, but it’s up there, for good reason. No one wants their hard work in the gym to be undone by a bit of social fun.

Speaking of social fun, I trained in a dungeon gym in the 1990s, where one guy sometimes had Jack Daniels instead of water in his gym water bottle. He was also one of the biggest guys there, but I don’t think it was because of his workout beverage. 0/10, would not recommend.

But let’s cut directly to the point: alcohol can be detrimental to your gains. There are no benefits to be had in a bottle when it comes to building muscle.

That being said, the key word here is “can”.

Some alcohol can be okay, but too much alcohol too often can be the gains goblin some people say it is.

Here’s how it works.

Alcohol vs. Protein Synthesis

The magic word in muscle growth is muscle protein synthesis (MPS).

Muscle growth happens when your MPS is greater than your muscle protein breakdown over time.

Your body is like a construction site. After you work out, it sends in a crew to build the muscle fibers stronger and bigger.

The foreman of this construction crew is a signaling pathway called mTOR (mammalian target of rapamycin).¹

When mTOR is activated, like after a gym session, the signal to create new muscle tissue goes out, and muscle growth is a go.

1. Activate it (lift)
2. Feed it (protein & calories)
3. Signal it (hormones & mTOR)
4. Recover it (rest & sleep)

Alcohol can gate-crash every step.

Alcohol interferes with the mTOR-pathway “build” signal and other anabolic (building up) switches that strength training normally flips on. At the same time, it increases catabolic (breaking down) ones.^{2 3}

Like turning down the construction crew and turning up the demolition team at the same time.

What Does the Research Say About Alcohol and Muscle Growth?

In the most cited human study on the topic, eight active men knocked back ~12 standard drinks (1.5 g ethanol/kg in the form of vodka and orange juice) after a heavy training session.⁴

Their muscle protein synthesis rate nose-dived 37%. It still dropped 24% when they chased the drinks with whey protein.

In short, the alcohol threw a wrench in the works, telling the mTOR foreman and his crew to slow down, even when all the building materials (protein) were available.

However, we need to take those results in context. Twelve shots of vodka is a huge dose. And, as often is the case, the dose makes the poison.

Few fitness enthusiasts would imbibe like that on a regular basis.

A similar study had 19 trained participants (10 men and nine women) do six sets of 10 heavy Smith-machine squats, followed by a vodka “gainer”: ~1.09 g of alcohol per kg of fat-free body mass.⁵

Unfortunately, this study didn’t look at MPS specifically, only at the signals that tell your body to start building muscle. However, those signals were significantly blunted in the men three hours after exercise.

Interestingly, the female participants weren’t affected.

No other human study, at rest or after exercise, has used low doses of alcohol and checked what it does to MPS.

So, for now, there is no published evidence in people showing what happens to MPS at ~0.5 g/kg (about 2–3 drinks).

Rodent studies show a clear dose-response: little change at 0.5 g/kg, a sharp fall in MPS by ~0.75–1.0 g/kg, and >50% suppression above 2 g/kg.⁶

But translating those thresholds to humans is tricky because rats metabolise alcohol much faster than humans. Plus, human and rat MPS don’t function identically anyway.

Reviews suggest that a dose of 0.5 g/kg body weight is unlikely to have much, if any, effect on recovery after training, even if there is no direct MPS data.⁷

The literature currently gives us one hard point at 1.5 g/kg/body weight (definitely bad) and one signalling point at ~1.09 g/kg/fat-free mass (probably bad, at least for men).

Below that is uncharted territory for muscle protein synthesis.

Everything points to alcohol reducing MPS in a dose-dependent manner.⁸ However, the amount where it doesn’t meaningfully have any effect is not known.

Hormonal Havoc: How Alcohol Affects Your Muscle-Building Hormones

Beyond just the mechanics of building muscle, alcohol can also mess with the hormonal environment you want for optimal muscle growth.

The two most important ones here are testosterone and cortisol.

Testosterone

Testosterone is the king of muscle-building hormones.

Heavy drinking, like 1.5 g of alcohol per kilogram of body weight, tanks your testosterone ~23% for at least 16 hours.⁹

An occasional drink or two, however, won’t harm your testosterone.

In fact, a low dose of 0.4 g/kg or ≈2 standard drinks increases testosterone levels by 10–20% for a bit.¹⁰ After a peak at 30 minutes, they are back down to normal at 90 minutes.

And you might be surprised by this one: alcohol after weight training increases testosterone by quite a lot.

In one study, 1.09 g of grain ethanol per kilogram of lean mass after heavy squats increased testosterone levels significantly compared to a placebo.¹¹

Now, don’t take that as a hint to switch your post-workout whey protein shake for a few shots of vodka.

Fluctuations in testosterone after working out are, contrary to popular belief, pretty meaningless for muscle gains.¹² The important factor is muscle protein synthesis. And, as you know by now, MPS goes down if you drink alcohol after training.

So, occasional moderate drinking won’t tank your testosterone levels permanently.

Chronic heavy alcohol use is strongly linked to reduced testosterone production, but that’s not something you need to worry about if you keep things moderate.¹³

Cortisol

Often called the “stress hormone,” cortisol is catabolic, meaning it breaks tissues down.

Cortisol is not always bad. On the contrary, acute cortisol release, like when you work out, is a normal response that helps your body adapt to training stress.

Chronically elevated cortisol levels: that’s the bad stuff.

Heavy drinking or frequent binges lead to higher levels 24/7, and it’s research suggests cause-and-effect, not just associations.¹⁴

A light or moderate alcohol intake, on the other hand, doesn’t seem to do much, and cortisol levels usually remain within a normal range.

Too much alcohol lowers your testosterone-to-cortisol ratio (T:C ratio), shifting your body from a muscle-building state to a muscle-breakdown state for at least 24 hours.¹⁵

• A high T:C ratio is an anabolic state. Your body is primed to build and repair tissue: the ideal state for muscle growth.
• A low T:C ratio is a catabolic state, in which your body breaks down tissues for energy. It can happen when you are overtrained, dealing with a lot of stress, or drinking too much alcohol.

Again, a little alcohol does not have this effect.

Too much, and your hormonal environment goes from one that supports muscle growth and fat loss to one that promotes muscle breakdown and fat storage, making it harder to improve your strength, build muscle, and maintain a lean physique.

Does This Mean I Can Never Drink Again?

Okay, let’s pump the brakes. The science sounds grim, but context is everything.

The two things that determine how much alcohol affects your gains are quantity and timing.

The Dose Makes the Poison

The most significant negative effects are associated with binge drinking (typically defined as five or more drinks for men, four for women, in about two hours, according to the National Institute on Alcohol Abuse and Alcoholism).

The studies I mentioned above use a hefty dose of alcohol to get those results.

Even though there are no studies looking at MPS after a low dose of alcohol, having one beer is not the same as six beers. A glass of wine with dinner is not the same as a bottle of wine and three cocktails.

The adverse effects of alcohol are strongly dose-dependent, and the impact of a single beer or glass of wine will be far less dramatic than what the high-dose studies show.

Timing and Nutrition Matter

If you are going to drink and still want your training to have maximum impact, you should at least time it so that the effects of lifting and the effects of the alcohol don’t overlap too much.

Drinking on an empty stomach right after a workout is likely the worst-case scenario.

Your muscles want nutrients to recover and grow bigger and stronger, and flooding them with alcohol instead of protein is the best way to not give them what they need, possibly blunting your training results in the process.

Instead, prioritize your post-workout nutrition.

Get your protein (and carbohydrates if you want) in first. Waiting at least a few hours before having a drink and having a solid meal in your stomach will mitigate the negative effects.

In fact, the study I talked about earlier, where alcohol blunted muscle protein synthesis by up to 37% also showed that consuming protein with alcohol was significantly better for MPS than consuming alcohol with just carbohydrates.

Zooming Out: What Big-Data Studies Say

Population data support the “moderation is key” tactic.

• For example, a 62K-strong Korean cohort found that increasing or decreasing alcohol intake didn’t meaningfully affect muscle mass, but more booze did mean more body fat.¹⁶
• The UK Biobank study with almost 200K subjects found 3 to 6% lower muscle mass in heavy drinkers, but no such effects with a low-to-moderate intake.¹⁷
• And a 19,900-person Japanese study sorted adults by weekly alcohol intake and found that “severe” drinkers (>60 g ethanol/day) carried significantly less muscle, but mild drinkers were indistinguishable from teetotallers.¹⁸

In addition, a 2021 systematic review of 12 studies found that moderate beer consumption has no negative effects on body composition (muscle, body fat), performance, or recovery from exercise, and that light beer works just fine for rehydration after working out.¹⁹

In short, light-to-moderate drinking seldom, if ever, has a dramatic effect on muscle mass, but the curve bends downward once intake moves into “heavy” or binge territory.

Alcohol and Body Fat

Alcohol’s influence also extend beyond muscle growth to another part of your physique: your body fat.

While the term “beer belly” is common, it’s not just beer that can increase your waistline.

Any alcoholic beverage can contribute to fat gain and make fat loss harder.

Alcohol is the second most calorie-dense nutrient, with 7 calories per gram. That is almost double that of carbohydrates and protein (4 calories per gram) and only slightly less than fat (9 calories per gram).

They are also “empty calories” because they give you energy but no nutritional value.

Consider the calorie load of common drinks (values from standard nutrition references like the USDA FoodData Central):

Beverage	Calories (kcal)	Where do the calories come from?
Regular lager/pilsner beer	~150	Alcohol & malt sugars
Light beer	~100	Reduced alcohol/sugar
Red wine	~125	Alcohol-derived calories
White wine	~120	Similar to red, slightly less residual sugar
Vodka, Gin, Rum, Tequila, 80 proof	~97	Pure alcohol
Gin & tonic	~190	Tonic water sugar
Bloody Mary	~120	Tomato juice carbs
Manhattan	~165	Vermouth sugar
Piña Colada	~490	Coconut cream & juice sugars

Those calories add up quickly and can easily push you into a caloric surplus.

Fat Burning on Pause

When you drink alcohol, your liver shifts its focus to metabolizing it. Your body prioritizes getting rid of the alcohol, and in the process, fat oxidation decreases.²⁰

While you’re running on alcohol calories, dietary fat is more likely to be parked in adipose tissue.

If your total calories stay the same, later hours can “catch up” by burning more fat once the alcohol is gone, and calories in vs. calories out still determine if you gain or lose fat.²¹

Appetite, Cravings, and Sleep

The problem is that, for many people, calories do not stay the same.

A meta-analysis of 38 controlled trials found that alcohol increases food intake, with larger doses having larger effects.²²

One classic experiment showed that four standard drinks before lunch made subjects eat 17% more food.²³

That’s because alcohol makes it harder to resist tempting foods you might otherwise avoid and messes with appetite-regulating hormones.

That combination often means hundreds of extra calories from food, on top of the calories from the alcohol itself.

In addition, alcohol sucks for sleep quality.²⁴

And sleep is essential for both building muscle and losing fat.²⁵

In short, if you log alcohol like any other macronutrient and stay in a deficit, the scale will drop.

Alcohol simply stacks the deck by adding calories that don’t satiate, making you eat more, messing with your sleep, and shunting dietary fat into storage first.

Calories in vs. calories out still rules.

But it is harder to create a deficit and keep it because alcohol calories don’t fill you up and often bring on munchies.

Alcohol’s calories add up, and they can add to fat gain and prevent fat loss. Like calories from any other source, but with effects beyond just empty calories added to the mix.

If you struggle to lose fat and you know you’re drinking more than you should, cutting back on alcohol removes a major roadblock on your way to a defined physique.

Occasional and moderate drinking can fit inside a fat-loss plan, but it does count, both on the label and in the mirror.

Summary and Takeaways

So, does alcohol kill your gains? The answer is: it can, but it doesn’t have to.

• Yes, heavy alcohol consumption directly impairs muscle protein synthesis and disrupts your anabolic hormones, leading to less recovery and growth.
• No, light to moderate drinking is very unlikely to undo your hard work in the gym.

As with almost everything, the dose is the most important thing.

A little won’t do much, if any, harm, but too much can make a real mess of your efforts.

Women seem to be less affected than men, with only men seeing the negative effects on muscle-building pathways in studies. However, women are more sensitive to the long-term health consequences of alcohol, so it isn’t a free pass for them either.

That being said, alcohol does nothing good for your muscles or your training. And the World Health Organization now states that no level of alcohol is health-risk-free.

Practical Recommendations

Below is a quick reference to minimise alcohol’s impact on hypertrophy:

1. Separate drinking and training. If you’re going to drink, separate your drinking session from your workout session by at least six hours to give muscle protein synthesis time to peak before ethanol shows up. And don’t drink before a workout. It’s a bad idea.
2. Dose matters. Keep it under ~0.5 g/kg (about three drinks for an 80 kg / 175 pound lifter) to avoid the sharp drop in MPS at higher intakes.
3. Protein helps. Even if it doesn’t eliminate the MPS hit, ~25 g of protein makes the negative effects less negative.

But ultimately, if your goal is maximum hypertrophy and strength gains, no alcohol is the best way to go.

Even occasional drinking may reduce your rate of progress. It’s not a total stop by any means, but it will subtract from potential gains, even if only by a little at low doses.

Frequently Asked Questions About Alcohol and Muscle Growth

Final Rep

If you are an elite athlete or a bodybuilder in contest prep, abstaining from alcohol is your best bet.

But for the average person looking to get stronger, build some muscle, and stay healthy, it’s about balance.

I wouldn’t promote drinking alcohol for anyone into fitness; I don’t drink myself, but not for reasons related to muscle gain or fat loss.

But training doesn’t have to mean teetotalling if you don’t want it to.

Muscles grow when the net balance favors synthesis over breakdown.

A nightcap or a beer now and then won’t topple that balance. But frequent binge drinking will.

Go for moderation, and your Friday pint can coexist with Monday’s PR.

Cheers to your future gains.

Last reviewed: 2025-08-06

References

1. Fac Rev. 2022 Nov 11;11:32.The role of mTORC1 in the regulation of skeletal muscle mass.
2. Quality in Sport. Online. 20 September 2024. Vol. 22, p. 54490. The Dark Side of Alcohol: Implications for Muscle Growth, mTOR Pathway, and Athletic Recovery.
3. Alcohol Res. 2023 Nov 2;43(1):04. Alcohol and Skeletal Muscle in Health and Disease.
4. PLoS One. 2014 Feb 12;9(2):e88384. Alcohol ingestion impairs maximal post-exercise rates of myofibrillar protein synthesis following a single bout of concurrent training.
5. J Strength Cond Res. 2017 Jan;31(1):54-61. Effect of Acute Alcohol Ingestion on Resistance Exercise-Induced mTORC1 Signaling in Human Muscle.
6. Nutr Metab (Lond). 2009 Jan 20;6:4. Alcohol-induced decrease in muscle protein synthesis associated with increased binding of mTOR and raptor: Comparable effects in young and mature rats.
7. Sports Med. 2014 Jul;44(7):909-19. Alcohol: impact on sports performance and recovery in male athletes.
8. J. Funct. Morphol. Kinesiol. 2019, 4(3), 41. The Effects of Alcohol Consumption on Recovery Following Resistance Exercise: A Systematic Review.
9. Alcohol Clin Exp Res. 1990 Dec;14(6):928-31. The pulsatile secretion of gonadotropins and growth hormone, and the biological activity of luteinizing hormone in men acutely intoxicated with ethanol.
10. Alcohol Clin Exp Res. 2003 Apr;27(4):682-5.Testosterone increases in men after a low dose of alcohol.
11. Med Sci Sports Exerc. 2013 Sep;45(9):1825-32. Postresistance exercise ethanol ingestion and acute testosterone bioavailability.
12. Exercise and Sport Sciences Reviews 52(4):p 117-125, October 2024. Hormones, Hypertrophy, and Hype: An Evidence-Guided Primer on Endogenous Endocrine Influences on Exercise-Induced Muscle Hypertrophy.
13. Int J Prev Med. 2024 Dec 28;15:75. Association of the Effect of Alcohol Consumption on Luteinizing Hormone (LH), Follicle-Stimulating Hormone (FSH), and Testosterone Hormones in Men: A Systematic Review and Meta-Analysis.
14. J Korean Med Sci. 2021 Jun 29;36(30):e195. Association between Alcohol Consumption and Serum Cortisol Levels: a Mendelian Randomization Study.
15. Med Sci Sports Exerc. 2014 Nov;46(11):2175-83. Ethanol does not delay muscle recovery but decreases testosterone/cortisol ratio.
16. Alcohol. 2023 Sep:111:9-16. Association of the amount of alcohol consumption with change in skeletal muscle and fat mass among Korean adults.
17. Calcif Tissue Int. 2023 May 25;113(2):143–156. Alcohol Consumption and Measures of Sarcopenic Muscle Risk: Cross-Sectional and Prospective Associations Within the UK Biobank Study.
18. Nutrients 2025, 17(5), 894. Impact of Alcohol Intake on Skeletal Muscle: A Large Cross-Sectional Analysis in Japanese Adults.
19. Int J Sport Nutr Exerc Metab. 2021 Sep 1;31(5):438-450. Got Beer? A Systematic Review of Beer and Exercise.
20. N Engl J Med 1992;326:983-987. The Effect of Ethanol on Fat Storage in Healthy Subjects.
21. Am J Clin Nutr. 1994 Mar;59(3):619-25. Effect of alcohol on postmeal fat storage.
22. Br J Nutr. 2019 Mar;121(5):481-495. Effect of alcohol consumption on food energy intake: a systematic review and meta-analysis.
23. Physiology & Behavior, Volume 81, Issue 1, March 2004, Pages 51-58. Dose-dependent effects of alcohol on appetite and food intake.
24. Sleep Medicine Reviews, Volume 80, April 2025, 102030. The effect of alcohol on subsequent sleep in healthy adults: A systematic review and meta-analysis.
25. Neuroendocrinology (2022) 112 (7): 673–701. The Potential Role of Sleep in Promoting a Healthy Body Composition: Underlying Mechanisms Determining Muscle, Fat, and Bone Mass and Their Association with Sleep.