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Let’s Ferment Brown Rice! A Step-by-Step Guide to Removing Antinutrients

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Brown rice contains ‘antinutrients’, and these can impact your health. But, it’s also a delicious and nutritious whole grain! This easy method lets you ferment brown rice to get rid of them.

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Barrel Alcohol Fermentation Picture - Ferment Brown Rice

Ah, you’re here for another journey through time? Alright, well we’ve got a good one today!

Today we’re going to explore “lacto-fermentation”, and see how and why we should ferment brown rice.

For thousands of years, our ancestors have harnessed the power of fermentation. Its uses range from preserving food to preparing food, preventing illness, and aiding in digestion. Because of this, it has been an essential part of many cultures throughout the world.

Brown rice contains beneficial fibre, vitamins, minerals, and is a source of slow-release energy (mostly complex carbohydrates). Because of this, it is a go-to food for athletes and bodybuilders alike!

However, in modern times we skip important processes that make such foods easily digestible and as nutritious as they should be.

So then, let’s get fermenting, shall we?

Why Even Bother? Think Again…

Rice is a seed. Brown rice includes the bran and germ, which contain many of the seed’s minerals and antioxidants! It is impressively healthy with benefits such as:

  • Being an effective gluten-free alternative
  • Improving heart health
  • Improving bone health
  • Boosting immunity
  • Promoting healthy sleep
  • Preventing neurodegenerative complications
  • Preventing obesity
  • Preventing even cancer

BUT, it also contains potentially harmful chemicals such as phytic acid and (inorganic) arsenic. These can damage digestive system, prevent nutrient intake, and may even be risky for the heart! Arsenic has also been associated with certain cancers. Now before you decide rice is bad for you, remember the list above and know that we can greatly reduce any risks it carries.

In short, the pros far outweigh the cons when we take a little time (and have some fun)!

When you soak brown rice shortly (as many do), you won’t be making much of a difference nutritionally. It might activate slight phytase activity and decrease cooking time. However, when you ferment brown rice, you remove more phytic acid, and add many more benefits! Here are a few important examples…

Phytic Acid and Arsenic

Phytic Acid

This antinutrient is something I have detailed in previous posts, such as this one on how to ferment oats! It is a chemical found in seeds (including nuts) that prevents the seeds from being digested, stores seed nutrients, and protects it by binding to minerals such as calcium, iron, and manganese.

This means that consumption of foods high in phytic acid can prevent nutrient absorption. Such foods include nuts and seeds, grains (like brown rice and oats), and legumes.

When we don’t prepare these properly we ingest large amounts of antinutrients, which can adversely affect our nutritional intake and digestion. This has led to deficiencies in some people, which of course has adverse effects. Phytic acid in particular can also cause damage to our guts as they can’t absorb important minerals needed to function.

Fermenting rice activates phytase (an enzyme) which breaks down the phytic acid and produces phosphorus. This is extremely effective, particularly when fermentation is kick-started (we’ll cover this later).

(Now, phytic acid is not entirely bad, and may have multiple benefits, but controlling the amount is essential. Removing 100% from our diets is impractical, and unnecessary, but it’s certainly worth getting a lot of it out).


This one is partially why we always rinse rice. Rinsing will wash small amounts away.

When we soak rice, the grains open up more and swell. In shorter soaking times such as overnight, this may eliminate up to 30% of the arsenic content. When we ferment rice, it is typically done so for at least 24 hours, which leaves more toxic arsenic to be reduced.

For the best results, it may also help to use more water, such as a 6:1 water-to-rice ratio.


Within our guts, each and every one of us is host to trillions of bacteria and other microorganisms. These are essential for our livelihood and health, and play important roles in proper digestion, nutrient absorption, detoxification, organ function, brain health and mood, dental health, and much more.

These beneficial microorganisms are known as probiotics. Collectively, we refer to this as our microbiota or microbiome (or gut flora).

Many people suffer from digestive issues, and increasingly we are finding that a lack of probiotic bacteria is a causing problem. In healthy fermentation, the bacteria used can boost our own bacteria and increase our health in many ways. As such, probiotic supplements and food items are becoming more popular as alternative treatments for certain ailments.

But guess what happens when we cook these foods? The heat actually kills the bacteria. And yet, we need to cook rice. So why am I making this point? Well, studies have shown that the consumption of even dead probiotics can benefit our immune system and decrease the chance of illnesses such as colds.

Therefore, by eating fermented brown rice we are benefiting our own immune systems! There are also other benefits, which we will cover soon.

Nutrients and Bioavailability

Brown rice is a particularly excellent source of manganese. Additionally, it is abundant in magnesium, phosphorus, iron, zinc, and also provides some calcium and potassium.

When it comes to vitamins, it also provides B1, B2, B3, B5, and B6 in appreciable amounts(^). As you can imagine, this means brown rice can be highly beneficial for us.

There are many benefits brown rice provides. These include improving cardiovascular health, cholesterol and trglyceride profiles, and blood sugar control, boosting the immune and nervous systems, decreasing the risk of Type 2 diabetes, and aiding in enzyme production.

By fermenting brown rice, we increase the availability and abundance of several important nutrients. There are multiple reasons for this, but perhaps the most significant is the reduction of phytic acid.

With less phytic acid, useful minerals won’t be bound to as much. This means that they won’t be taken out of our food, and instead will be released in greater amounts, allowing us to absorb them better.

Improve Digestive Health!

So, we’ve covered that fermented brown rice can benefit our digestive health such as by increasing enzyme production, aiding metabolism, and providing a wealth of nutrition. However, it is also a brilliant source of fibre (/fiber).

Mostly, the fibre found in brown rice is insoluble fibre. This type of fibre is important in helping to speed up digestion, therefore making brown rice beneficial for those with conditions such as constipation. It can also prevent diverticulitis.

Another benefit of insoluble fibre is that it is ‘prebiotic’. Remember the probiotics we mentioned earlier? Well, just like we eat to survive, so do they! Insoluble fibre is one of many food sources for them. This helps to fuel their health, and they help to fuel ours.

However, some people have a low-fibre diet (such as that low in whole grains, fibrous vegetables and fruits, and high in refined grains or potatoes). Suddenly adding a lot of insoluble fibre can cause upset in such cases. This may include bloating, gas, and irregular bowel movements. It is recommended to introduce high fibre slowly into the diet rather than all at once.

Furthermore, brown rice also contains small amounts of soluble fibre, which helps to slow down digestion, and reduce HDL cholesterol!

Less Carbohydrates Means Less Sugars!

Although brown rice is brilliant for providing slow-digesting complex carbs, some people respond best to a more moderate-carb diet.

Here is one of the great benefits that fermenting rice provides. As a matter of fact, fermenting food reduces the quantity of carbohydrates it contains.

This helps to lower insulin response, and if eaten often, fermented foods may lower blood sugar levels by replacing high carbohydrate alternatives.

Remember we mentioned that brown rice can help to prevent type 2 diabetes? Even better, when we ferment brown rice, the grain may become more friendly for those with the condition.

This works because enzymes convert starches to sugars, which the bacteria then feed off of, resulting in reduced overall carbohydrate levels.

P.S. Ever noticed that some old fruit (particularly in the summer) will take on alcohol-like taste if left out?

If you have, it should now be no mystery… Bacteria and yeasts naturally present on the food (or in the air) feed on the sugars and voila! You have alcohol.

Cooking Time – Save Energy!

We all know what saving energy means! We get to help the planet out, and save money doing so.

Ferment Brown Rice - Healthy Fermented Brown Rice and Water Photo
Here’s what the rice should look like after cooking, along with the leftover brine.
~(Photo of my last batch)

It’s a win-win! When you ferment brown rice you actually will halve the cooking time – so instead of that 40 minutes on the stove, you can cut it down to 20.

Or you can even make it just around 14 minutes in the microwave (which uses much less energy, too).

I Want to Ferment Brown Rice. So How Do I Get Started?

Well, it’s actually pretty simple to ferment brown rice, and only takes a little planning ahead. Want a chili con carne with rice this week? How about even tomorrow? Planning this is easier than planning your shopping!

There’s a formula which is particularly useful here. Especially so if you eat rice often!

24 Hour Soak X 3 = 96% Phytic Acid Removed (decant at least 10% water). What this means is that when we ferment rice, we can remove up to 96% of the phytic acid by our third batch.

This is achieved simply by keeping around 10% of the water, and reusing it in the next batch. This rice water can be stored in the fridge for up to two weeks.

The reason that reusing the water works is that activated Phytase will still be present and working!

What You’ll Need (produces 3-4 cups cooked):

  • Dechlorinated Water* – 3 cups
  • Brown Rice – 1 cup
  • A Fermentation-Safe Bowl Or Container (Such as Stainless Steel (look for ‘316’), Glass, Ceramic/China, or some plastics**).
    • Suitable metals: Stainless Steel. Avoid others like aluminium or copper: They will react with the acids produced in fermentation.
    • Suitable plastics: Polycarbonate Plastics, PP, HDPE, or LDPE.

I use a glass mason jar quite often for my ferments, especially for larger batches. Just a few jars let me ferment delicious homemade pickles (find out how here), oats, beans and legumes, and more!

It’s a worthy investment if you love cooking and trying new methods, and definitely if you’re serious about healthy cooking.

Airtight One Gallon Standard Fermentation Lid Gasket with Airlock

Amazon’s Choice, 4.2 Stars

Note: You don’t need an airtight container for this ferment. A mason jar is great to have if you ferment often or want to make homemade alcoholic brews, pickles, or hot sauce, for example.

What to Do:

  1. Rinse the rice (only if you have enough dechlorinated water*, such as a filter tap), and drain.
  2. Add the rice and dechlorinated water to the bowl.
  3. Leave it for at least 24 hours.
  4. Drain and rinse thoroughly, saving some (10%+) water for next time.
  5. Cook in half the time required for raw rice, and enjoy!

*To dechlorinate water, you can either use a filter, or boil it. Here are my recommendations for water filters.

P.S. You can use any wholegrain rice with this method. They’re all great sources of carbs and nutrients. (I used brown and red rice in the image below)!

Fermented Brown Rice and Water (Ferment Brown Rice) 5

Fermented Brown Rice

James Mcdonald
A delicious traditional method to prepare brown rice and boost digestibility!
Prep Time 30 minutes
Cook Time 20 minutes
Fermenting Time 3 days
Total Time 3 days 50 minutes
Course Appetizer, Breakfast, Main Course, Side Dish
Cuisine Indian, International, SE Asian
Servings 4 cups
Calories 200 kcal


  • Fermentation Safe Container / Bowl (See Notes)


  • 3 cups Dechlorinated Water (See Notes)
  • 1 cup Brown Rice or other wholegrain variety


  • Measure your rice and dechlorinated water.
  • Add the ingredients to a suitable container, making sure the rice is fully submerged.
  • Leave to ferment for at least 24 hours (even up to 72).
  • Check daily for bubbles and a yeasty or slightly cheesy smell (this is good)! If any mold forms, discard.
  • Once ready, drain the rice, (refrigerate 10% water for next time), rinse well, and cook in half the time of raw.
  • Serve and enjoy! 🙂


To dechlorinate water: You can use a Water Filter (See Recommendations) or simply boil the water using a kettle to remove the chlorine.
Make sure you let it cool to a lukewarm temperature before you use it, otherwise the heat will kill the beneficial bacteria and denature the phytase.
For the container: Remember, you should use ceramic, china, stainless steel 316, glass (but keep in a dark place), or Polycarbonate, PP, HDPE, or LDPE Plastic containers only.
Other plastics and metals will react with the acidity and interfere with the natural processes of fermentation. For example, non-steel containers will rust, and plastic may leech.
Keyword Fermentation, Healthy, Probiotic, Rice, Traditional

Read: The Top Water Filters For Drinking Water – Top 5 For Every Purpose!

And that’s it! Really, nothing more, nothing less… Make sure the water is lukewarm when you start, and at least room temperature throughout. (NOT cold or hot).

Beneficial bacteria on / in the grains like Lactobacillus species will do the work from there, and multiply over time! Because of this, this fermentation process is often referred to as “Lacto fermentation“.

How Do You Know You’ve Done It Right?

There are telltale signs for a good ferment… And a bad one.

You should see lots of bubbles – this is perfect. Just look at mine after 2 days! You may get less; it depends on the amount you ferment, the time, the temperature, and how packed the rice is.

How to Ferment Brown Rice - Probiotic, delicious, remove antinutrients phytic acid and arsenic jpg
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Fermented brown and red rice – stirred after 2 days.

Beneficial probiotic bacteria such as Lactobacillus produce carbon dioxide as a by-product of digestion. This then rises to the surface of the water to create the bubbles! If you see this, it should be a good sign.

What you shouldn’t see is anything resembling mold.

Anything “fluffy”, white, green, or other is bad. Get rid of the whole batch if this happens. It has never happened to me and shouldn’t to you – just keep the rice fully submerged and use clean tools. Easy! 🙂

Another good sign is the smell… Particularly if fermenting for more than 24 hours. It should smell “cheesy” – this is okay and will have only a minimal impact on the taste (even less if you serve it with other foods, herbs, and spices)!

The aroma might also be a little “sour”. It shouldn’t be “fishy” or anything else typically indicative of mold. If it is, definitely discard it.

View the FAQ below for extra questions, or feel free leave a comment and I’ll get back to you!

Now Go and Experiment! BUT WAIT…

Now, before you rush off in excitement and get going, let’s recap on some important points! 🙂

I know it’s all fun, but it sucks to get it wrong and have to restart, so remember this:

  1. Brown rice is incredibly healthy. It provides prosperous amounts of nutrition, and also beneficial fibre (and complex carbohydrates).
  2. Brown rice is also high in phytic acid and arsenic.
  3. These can be reduced greatly if we ferment brown rice.
  4. You can even save energy by reducing cooking time.
  5. Fermenting rice is easy, effective, and only requires a little planning!
  6. Remember to use dechlorinated water and at least a 3:1 ratio of water to rice when cooking.
  7. You should see bubbles on the surface of the water, and the rice should take on a cheesy and perhaps slightly sour aroma.
  8. Remember to save some of the water to reuse!

And we’re ready! Comment below if you learned anything new, or let me know how this goes for you!

Also why not visit us on social media and become part of the Healthy Ronin community? I’ll be sure to respond and would love to hear if you like this recipe.

This is one of my favourite meal prep recipes, and it’s extremely versatile!

Also, why not try out my wholesome and earthy Turmeric Brown Rice Recipe? It’s great for balancing out aromatic and spicy meals and I’ve enjoyed it with all sorts of recipes, like these very ones on this website:

That’s it for this post, I hope you’ve learnt a lot today! 🙂 If you enjoyed this, you might enjoy my other posts, so feel free to have a browse!

Until next time, stay healthy

Frequently Asked Questions:

Can You Soak Brown Rice too Long?

In theory, soaking the brown rice will help to preserve it, as long as there is lacto fermentation. The acidic and anaerobic environment created keeps unwanted bacteria and mould from growing. That said, it’s recommended not to leave it for longer than a few weeks or even a few months. But, it may last up to over a year if you refrigerate it in the brine.

Does Soaking Rice Reduce Carbs?

Soaking rice alone may help to release starches as the grain softens. However, the impact will be greater with fermenting. This allows enzymes to convert starches to sugars, which bacteria then feed off of, resulting in reduced carbohydrate levels.

Does Soaking Brown Rice Remove Nutrients?

Soaking or fermenting brown rice will not reduce overall nutrition. The more bioavailable minerals may be slightly reduced by soaking and rinsing, however the increased availability more than makes up for this (^). Fermenting also adds B-vitamins and even slightly boosts protein.

Why Should You Rinse Brown Rice before Cooking?

Firstly, we rinse it after to wash away the arsenic and excess starches.
After fermenting, the brine will contain the arsenic we want to get rid of, and will also hold some released starch. By rinsing the rice grains we wash these away.

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10 Replies to “Let’s Ferment Brown Rice! A Step-by-Step Guide to Removing Antinutrients”

  • I had no idea about fermented brown rice! I do not know very much about fermenting, but I was wondering how long you should keep the 1/10 of the water before throwing it out and starting over. I read that it can last for two weeks?
    So after two weeks, you should start the process over again? And if I understand you right, say if we made eight pots of rice in 2 weeks, by the third pot of rice, we should have an optimum fermented product?
    The reason that I asked is that with seven people in my house, we can go through a lot of rice and I am still not too sure when to throw the water out. I am very excited to try this process out! Thank you!

    • Thanks for your interest, Colleen!
      Many people are unaware of these kinds of things nowadays! So I’m happy to be sharing this and helping people learn more. 🙂
      When it comes to storing the water, it is recommended not to store it for longer than two weeks after it has been used and decanted. However, it is perfectly fine to use it before then or any time until the two weeks is up!
      Also you are absolutely correct! As long as the ratio and amount of water:rice used stays the same, you should have optimum fermentation from the third batch and onwards. So if you make enough for 7 people, and use 10% of the water to make the same amount again, then that would work greatly!
      I hope you enjoy this! It’s a very fun and interesting process, so I’m sure you’ll be just as excited to do it again after the first time haha.
      Thank you for the question, and best of luck!

  • Oh my goodness, I had never heard of fermenting rice either. With my tummy issues I’m going to try this today. I was planning on making a rice dish today, but I’m going to ferment the rice and make it tomorrow. You make this so simple. Thank you.

    • That’s great! Please do make sure to try a little at a time, and see how it goes for you. This is great for digestive health, but everyone should introduce fermented foods into their diet at their own pace 🙂 Let me know how you find it!
      Thank you, and the best of wishes,

    • What a great idea, I like it! It absolutely will work the same way. In fact, you can use any kind of rice (although it’s only really necessary for wholegrain varieties).

      I’d love to hear how it goes for you as I’ve never tried fermenting black rice myself. Thanks for the positive rating! 🙂

      Best of luck,

  • Mate, put some brown sugar, sea salt in your water-rice mix and shake it, release the gas, close the jar. Release and shake the gas every day. After 4-5 days, the liquid will be more valuable than rice.

    • Hahaha, well I admit I hadn’t quite considered that! Essentially homebrewing sake from brown rice would definitely be an interesting project, but I know the best practice is with different equipment. Might have to keep it in mind, though.

      Thanks for the interesting idea!

  • Questions…
    -should rice be covered while fermenting?
    -if the water contains arsenic why would you want to reuse it?
    -if cooking after fermenting, what ratio of water to rice is needed?

    Thank you,

    • Hi Andrea, great questions.

      – Ideally, yes, the rice should be covered, as this will minimise the chance of unwelcome particulates or bacteria making their way into the water.
      – Remember, you discard most of the water and only reuse a small amount to start eh next batch, and then you wash the rice after fermenting anyway to fully rinse off the fermentation water and anti-nutreints and arsenic.
      – I generally find that a 2:1 ratio of water:rice works very well, so basically half of the ratio for standard white rice. This will depend on your specific rice, however, and how much it swells and the amount of water it soaks up during the fermentation / soaking phase.

      I hope this helps! Any more questions, please do ask. 🙂

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