Table of Contents
Marijuana is a controversial subject. While it is illegal to buy, sell or consume it, for many people it’s a part of everyday life. But what effect does marijuana have on bodybuilding?
Testosterone
Testosterone is the main hormone involved in building your muscles and shredding fat. Bodybuilders always want to have relatively high levels of testosterone to maximize both their performance and aesthetics, hence why many bodybuilders are seen eating lots of red meat and eggs, which can naturally boost your testosterone levels, take testosterone boosting supplements, or rely on anabolic steroids, which artificially increase your levels of testosterone.

The results from studies done regarding marijuana use and testosterone levels are a little bit confusing and not exactly clear – while some seem to show a correlation with the increased use of marijuana and decreased testosterone levels, some may show it has little effect, if any at all.
Read more: Marijuana and the Immune System
In animal studies, though, the results have been fairly clear – ingesting marijuana inhibits the production of testosterone and has a negative impact on the Luteinizing hormone (LH) which is released by the pituitary gland and aids in synthesizing testosterone to help with building muscle tissue.
One study did show a negative effect on testosterone from smoking just one joint, however, participants’ hormone levels were back to normal within 24 hours, showing that infrequent consumption on Marijuana seems to have little to no effect on testosterone levels whatsoever.
One study did show a negative effect on testosterone from smoking just one joint, however, participants’ hormone levels were back to normal within 24 hours, showing that infrequent consumption on Marijuana seems to have little to no effect on testosterone levels whatsoever.
Metabolism
Your metabolism relates to the speed at which your body digests and uses calories. A high metabolism means you digest food quickly and have a high rate of energy turnover from the food that you eat. In basic terms it means you can eat more calories and still maintain your weight. A slow metabolism often requires you to have to severely cut calories to burn fat.
Ideally, bodybuilders want a high metabolism, as this means when cutting for competitions they can eat more food and still lose fat quickly, and they can eat more still when building muscle in the off season.
Smoking marijuana has been shown to lower thyroid hormones in the blood, although no study has ever shown it to have an impact on thyroid function. This potentially means that your metabolism may be lowered slightly in the short term when using marijuana, but there are unlikely to be any long lasting ill effects.
Ideally, bodybuilders want a high metabolism, as this means when cutting for competitions they can eat more food and still lose fat quickly, and they can eat more still when building muscle in the off season.
Smoking marijuana has been shown to lower thyroid hormones in the blood, although no study has ever shown it to have an impact on thyroid function. This potentially means that your metabolism may be lowered slightly in the short term when using marijuana, but there are unlikely to be any long lasting ill effects.
Growth Hormone
Marijuana has, though, shown to impact your body’s production of growth hormone. Growth hormone has a similar significance as testosterone, and you want high levels of it to build muscle mass. Again, you can increase growth hormone through your diet and training, and also take supplements or ergogenic performance aids to get an increased growth hormone profile. Marijuana can lower your growth hormone levels, which will temporarily impact your muscle growth and recovery rate.
Calories
Weed doesn’t have calories, so in that respect, it doesn’t have a role in weight loss or weight gain. However, an extremely common side effect when smoking marijuana, even after just a few puffs on a joint is “The Munchies”. This relates back to the increased feelings of pleasure and relaxation that marijuana causes. Quite often you’ll find yourself starving hungry, and will eat literally anything – most likely junk food. Bodybuilders know that this has a massive impact on health, performance and body composition.
If you smoke weed regularly, and always end the night with a burger, some candy or fries, chances are you’ll massively over consume calories, which will have severely detrimental effects on your physique.
If you smoke weed regularly, and always end the night with a burger, some candy or fries, chances are you’ll massively over consume calories, which will have severely detrimental effects on your physique.
Mental Focus
As discussed, pot will make you feel more relaxed. While you may think that this is a good thing, as it reduces your levels of stress and helps you chill out, it can have the opposite effect. To train hard, you need a certain amount of aggression every time you step in the gym. Many bodybuilders use training as an opportunity to let out some tension they might be feeling from work or family life, but if you’re always really chilled out, you’ll struggle to find that motivation to hit the weights.
Cardiovascular Function
This may be more of an issue for endurance athletes, but marijuana can impair your cardio-respiratory function, by slowing down your blood flow and heart rate, meaning it takes longer for oxygen to get round your body. Bodybuilders may not be particularly worried about this. But weight training does involve a cardio element. A really tough set of 20 back squats, or a set of rest-pause deadlifts will leave even the fittest bodybuilder gasping for air. If your cardio function is impaired, you won’t be able to train nearly as hard.
Marijuana may not have an all out disastrous effect on your bodybuilding progress, but it certainly won’t help you either. Refrain from smoking weed, and you’ll certainly feel the benefits in the gym and in your physique.
Marijuana may not have an all out disastrous effect on your bodybuilding progress, but it certainly won’t help you either. Refrain from smoking weed, and you’ll certainly feel the benefits in the gym and in your physique.
- “Marijuana and Bodybuilding”, Accessed on August 26, 2012, Retrieved from http://www.illpumpyouup.com/articles/marijuana-and-bodybuilding.htm
- Photo courtesy of pasukaru76 on Flickr: www.flickr.com/photos/pasukaru76/5268559005
- Photo courtesy of northcascadesnationalpark on Flickr: www.flickr.com/photos/northcascadesnationalpark/3885040262