Does BCAA or Beta-Alanine Break Your Fast?

Will taking BCAAs or Beta-Alanine break your fast before hitting the gym? We look at the main things to bear in mind

Does BCAA or Beta-Alanine Break Fast
(Photo: Adobe Stock)

If you’ve landed on this page, you’re probably wondering whether it’s OK to take BCAA or Beta-Alanine while practising intermittent fasting.

And if you’re looking for the answers to those questions, then you’ve arrived in the right place.

If you’ve done any research yourself as to whether BCAAs or Beta-Alanine break your fast, then you’ve probably come across some conflicting information on bodybuilding forums and elsewhere online.

Intermittent fasting is becoming more and more popular, but sometimes it can be tricky to work out what you should and shouldn’t consume during your fasting windows.

The question of consuming BCAA and Beta-Alanine during fasts is quite a common one, because these supplements are often used before, during or after gym sessions.

In this article, we’re going to take a close look at both of these popular fitness supplements to see whether or not you should be consuming them while intermittent fasting.

We’re going to look at what the science says about these particular supplements when it comes to fasting.

Editor's note: The content on this website is meant to be informative in nature, but it should not be taken as medical advice. The content of our articles is not intended for use as diagnosis, prevention, and/or treatment of health problems. It’s always best to speak with your doctor or a certified medical professional before making any changes to your lifestyle, diet or exercise routine, or trying a new supplement.

So, let’s now get cracking and start taking a look at whether BCAA or Beta-Alanine will break your fast or not.

What is Intermittent Fasting?

You probably already know all about intermittent fasting if you’ve landed on this page, but let’s quickly cover the basics.

Intermittent fasting, sometimes also known as time-restricted feeding, is simply the name given to various eating patterns that involve fasting (not eating) for periods of time.

For example, you may stick to a daily 16-hour fast, which features an eight-hour ‘eating window’. An example of this would be that you consume your last meal at 8pm and would not eat anything until midday the next day.

You can still drink as much water as you like during your fasting window.

There are also a number of other fasting protocols, and there are plenty of resources out there to teach you more about it and its potential benefits.

One of the reasons why intermittent fasting has become so popular in recent years is that there are a number of supposed health benefits it may bring. Early studies have suggested that fasting could have unique metabolic benefits. That said, more human research is needed to prove this.

Weight loss is another reason why many people choose to try intermittent fasting.

It’s common knowledge, but to lose fat, you need to burn more calories than you eat. And some people find it much easier to reach this goal via intermittent fasting rather than reducing overall meal size.

Many people also swear by ‘fasted training’. This is where you choose to hit the gym and work out in a ‘fasted’ state.

The theory here is that your body may be more primed to use fat as an energy source if you are in a fasted state while exercising, although more research is probably needed to confirm this.

So, now that we’ve covered the basics about intermittent fasting, it’s time to start taking a close look at BCAA and Beta-Alanine.

What are BCAA and Beta Alanine?

• BCAA – BCAA is the abbreviation for Branched Chain Amino Acids. The amino acids in question are Leucine, Isoleucine, and Valine.

BCAAs are present in certain foods such as meat and eggs.

Supplementation with BCAAs can help to top up your consumption of BCAAs from dietary sources in a convenient and easy to manage way.

Beta Alanine

Beta Alanine is a popular pre workout ingredient (Photo: Adobe Stock)

• Beta-Alanine – Beta-Alanine is a version of the amino acid Alanine.

It’s popular as a pre workout supplement ingredient, and it’s know as the ‘building block’ of the molecule Carnosine.

You’ll find Beta-Alanine as one of the ingredients in many of the leading pre workout supplements out there on the market at the moment.

So, now that we’ve got a bit more context, let’s now take a look at whether BCAAs or Beta-Alanine will break your fast.

Does BCAA Break Your Fast?

The short answer to this is that yes, consuming BCAAs will probably break your fast. However, the long answer is a little more complex.

You probably already know this, but Amino Acids are the building blocks of protein. The truth of the matter is that if you consume one of these Amino Acids (such as the BCAAs Leucine, Isoleucine, and Valine), then you’re not really fasting, because you are, in theory at least, consuming small amounts of protein.

That being said, some people may feel that the benefits of consuming BCAAs while fasting outweigh the drawbacks.

For example, some people consume BCAAs while training in a fasted state because they feel that they could help to support their training sessions.

The bottom line here is that technically speaking, BCAAs do break a fast. But many people feel that the benefits of consuming them while fasting outweigh the negatives.

All that being said, if you want to be 100 per cent sure that you’re not breaking your fast, then only consume water during your fasting window.

Does Beta-Alanine Break Your Fast?

The short answer to whether Beta-Alanine breaks your fast is probably not.

As we mentioned above, Beta-Alanine is a modified form of the Amino Acid Alanine.

However, Beta-Alanine is considered to be a “non-proteinogenic” Amino Acid, meaning that it is not involved in protein synthesis (muscle building) in the body.

For this reason, most people accept that consuming Beta-Alanine will probably not break your fast.

The same goes for other non-proteinogenic Amino Acids, such as D-Aspartic Acid and Betaine. They are generally considered not to break a fast.

That being said and as we explained above, if you want to be 100 per cent sure that you’re not breaking your fast, then only consume water during your fasting window.

Anything Else To Consider?

Clearly, there is some debate about what does and doesn’t break a fast. Many forums are filled with heated discussions about various supplements and their impacts on fasting.

If you want to be 100 per cent confident about not breaking your fast, then it may be best not to consume any supplements at all.

Supplements are not intended to replace a varied, balanced diet and a healthy overall lifestyle.

As always, we recommend speaking to your doctor before thinking about trying any new supplements for the first time.

We also always strongly recommend that you make sure that you’re sticking to healthy diet, exercising regularly and getting plenty of rest before thinking about any kind of supplementation.


That brings us to the end of our look at whether BCAAs or Beta-Alanine break your fast.

The short answers are as follows: Yes, BCAAs will probably break your fast. No, Beta-Alanine probably won’t break your fast.

We’ve walked you through the basics about intermittent fasting and how many people adopt this method as a way to improve overall health and help with weight management.

We’ve also spoken about the basic facts about BCAAs and Beta-Alanine as popular fitness supplements.

As always, remember to speak to your doctor before making any major lifestyle changes or thinking about any kind of new supplementation.

The first things you should always do is make sure that you’re sticking to a healthy diet and are exercising regularly.

The information on this website is intended for entertainment purposes only and does not constitute professional, medical or healthcare advice or diagnosis.

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