Alcohol and Athletic Performance

alcohol athletic performance sport performance Apr 10, 2023

Katie Breazeale, MS, RD, LD


I honestly believe you know already that alcohol doesn’t help your athletic performance and training. But, do you realize how much it can hinder you? 


Downside 1: It Dehydrates You

One of the main reasons for your throbbing skull and dry mouth the day after a big night on the town is dehydration. You lose much more water than you gain when you drink—even if you drink a lot. Ever notice how often you run to the bathroom? That's part of it. And because there's not enough to go around, water that should go to the brain is redirected to other organs, hence that headache. When dehydrated, people are at greater risk of sustaining musculoskeletal injuries such as cramps, muscle pulls and strains. This increased risk of injuries can result in reduced training time and diminished muscle gains.


Downside 2: It Can Contribute to Weight Gain

Alcohol isn't a carbohydrate, fat, or protein. It's just alcohol, or basically, a fourth macronutrient. That means that it has calories, even if you're drinking the hard stuff straight out of the bottle with no mixers. And the way alcohol consumption affects your body is definitely different than, say, what you get from a solid dose of protein or some vegetables. At 7 calories per gram, alcohol is also the emptiest of calories.


An average alcoholic beverage is anywhere from 100-200 calories, but we all know that in drinking, one man's average is another man's warm-up, so the numbers can go way higher. And to be clear, all these extra calories, when not metabolized, will be stored as fat. Not the look you were going for when you started training, huh?


Downside 3: It Can Disrupt Muscle Growth

Not only does alcohol have zero nutritional value, but some studies also say it may even disrupt muscle protein synthesis, and muscle growth. (Google it if you have a day or two to kill.)


Of course, many studies are questionable, reporting only on "chronic" drinkers or even non-human subjects. That said, anyone who has taken ninth grade biology knows that alcohol is metabolized before other nutrients, blocking them from being absorbed. This can hinder protein synthesis.


Protein Synthesis

To achieve muscle growth, you must have a positive muscle protein balance. If you don't consume enough protein or exercise enough, your muscle breakdown may exceed your muscle gains, leading to a catabolic state in which you are losing muscle tissue. Alcohol can also put your body into a catabolic state due to its high calorie content and disruptive nature when it comes to normal bodily processes, such as protein synthesis.


Downside 4: It Interrupts Your Sleep

Plenty of people—but definitely not all of them—find they fall asleep better after a drink or two. But the sleep that comes afterward can be poor quality, to say the least. You need sleep so your body can grow, repair, and get strong. Sleep also seriously affects your levels of testosterone, and by extension, muscle building. Remember, muscle is built when you recover. You do not want to stand in the way of that.



A major part of protein synthesis involves several hormones involved in the muscle-building process, namely testosterone and human growth hormone. According to Notre Dame, alcohol affects the release of both of these hormones. Alcohol can negatively impact this essential hormone in two different ways, both of which can significantly short circuit muscle gains:


Alcohol has been shown to increase the stress hormone cortisol, which can reduce the levels of growth hormone by as much as 72 percent.


Growth hormone is predominately secreted during the early sleeping hours of the night. Because alcohol tends to disrupt natural sleep rhythms, it can decrease the amount of growth hormone released by as much as 70 percent. 


Alcohol consumption also causes your liver to release substances that virtually cancel out the effects of testosterone in your body. The result is an environment not suitable for muscle growth.


Testosterone levels are decreased with alcohol consumption. More estrogen is created with alcohol consumption thus causing:

           Increased fat depositing

           Fluid retention

           Gynecomastia (man boobs)


Bottom Line:

           Decreased blood flow

           Increased fat depositing


           Depletes Magnesium, Potassium, and calcium stores

           Inhibits protein synthesis (decreased muscle growth)



Long story short alcohol is not just about dehydration or empty calories consumed. Alcohol can mess with your hormones, sleep cycles, heart rate, and more. I am all about a celebratory drink, but keep in mind what factors could be at play and the benefits to your health you could have from changing what you choose to drink. 

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