You've probably heard that alcohol intake lowers testosterone. While this is true, the actual impact has been widely exaggerated. A three-week study that had men and women consume 30-40 g alcohol per day, showed a 6.8% reduction in testosterone for the men and none for the women at the end of the study-period. That's three beers a day for three weeks and a measly 6.8% reduction in testosterone for the men. What kind of an effect would you think a few beers on an evening once or twice a week would have? Hardly any.
For alcohol to significantly lower testosterone, you need to do some serious drinking. ~120 g alcohol, the equivalent of 10 beers, will lower testosterone by 23% for up to 16 hours after the drinking binge. If you drink so goddamn much that you are admitted to the hospital, you get a similar effect with a reduction of about -20%.
A few studies have looked at alcohol consumption in the post-workout period. One study examined the hormonal response to post-workout alcohol consumption using 70-80 g alcohol, equivalent to 6-7 beers. Talk about "optimizing" nutrient timing. Anyway, despite this hefty post-workout drinking binge, no effect on testosterone was found and only a very modest effect on cortisol was noted. The latter is as expected, considering the effect of alcohol on catecholamines. Citing directly from this paper, this quote sums up the scientific findings regarding the effects of alcohol on testosterone:
"Although the majority of studies involving humans show no ethanol effect on serum luteinizing hormone (LH), some data have demonstrated an increase while others have supported a decrease"
- Koziris LP, et al (2000).
It seems that the fitness mainstream, which has been most adamant about propagating the "alcohol-zaps-testosterone-myth", have cherry-picked a bunch of studies to base their claims on. Well, no big surprise there. We've been through this many times before with meal frequency and countless other diet myths.
When it comes to recovery after strength training, moderate alcohol consumption (60-90 g alcohol) does not accelerate exercise-induced muscle damage or affect muscle strength.
However, the research is a bit mixed on this topic. One study, which used a very brutal regimen of eccentric training only, followed by alcohol intakes in the 80 g range (1 g/kg) noted impaired recovery in the trained muscles. I should note that eccentric training is hard to recover from and the volume used here was pretty crazy.
Another study looked at exhaustive endurance training followed by post-workout alcohol intakes in the 120 g range (1.5 g/kg) and saw significant suppression of testosterone that carried over to the next day.
The common denominator among these two studies is either extremely tough training or unusually high alcohol intakes in the post-workout period. Unless you're in the habit of going bar-hopping after 50 reps of eccentric leg extensions to failure, this stuff does not apply to you. Yet it's studies like these that gets the attention among the alcohol-alarmist fitness crowd.
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