How Does Fruit Ferment Naturally – Facts About Fruit Fermentation

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In a world all about food and drink, fermentation is a process people often misunderstand – calling it old-fashioned and challenging. However, it is one of the oldest yet simplest methods of food preservation and alcohol preparation. 

Fermentation, indeed, is one of the most healthful ways to consume food, as it unlocks all sorts of nutrients and enzymes that would otherwise be unavailable.

So, the question arises, how does fruit ferment naturally, and how can we speed up this process?

Let’s go for a deep discussion on our said topic – natural fruit fermentation! We will explore the different fermentation methods, how do you make fruit ferment and other related topics of natural fruit fermentation.

FruitsFermentation Period
Apple2-6 weeks
Banana36 to 48 hours
Grapes2 to 3 weeks
Pears2 to 6 weeks
Plums5 to 7 days
Cherries1 to 2 weeks
Berries2 to 3 weeks.

Different Types Of Fermentation

Different Types Of Fermentation

Fermentation is a process that breaks down complex molecules, like starch and sugar, into simpler molecules like alcohol and carbon dioxide. In fermentation, yeast or bacteria convert sugar into ethanol and carbon dioxide. Ethanol is the alcohol that we drink, and carbon dioxide is what makes our bread rise and gives beer its bubbles.

However, there are three main types of fermentation.

1. Lactic Acid Fermentation

This is the most common type of fermentation, and it’s used to make things like yogurt, cheese, and pickles. During lactic acid fermentation, bacteria convert lactose into lactic acid, which gives food a sour taste and helps to preserve it.

2. Alcoholic Fermentation

The process of alcoholic fermentation is used to make beer, wine, and other alcoholic beverages. Yeast converts sugar into alcohol and carbon dioxide in anaerobic conditions.

However, yeast needs a food source, such as sugar, to grow. So finally, the sugar is broken down into ethanol and carbon dioxide. The carbon dioxide escapes from the liquid, and the ethanol produces what makes the alcoholic beverages.

3. Acetobacter Acetic Acid Fermentation

Another key ingredient in alcoholic fermentation is acetobacter acetic acid. Usually, this is the type of fermentation used to produce vinegar.

This bacterium converts alcohol into acetic acid (vinegar), which gives alcoholic beverages their sour taste. Acetic acid is also responsible for the taste of alcohol!

How Does Fruit Ferment Naturally

How Does Fruit Ferment Naturally

Many often ask – can fruit ferment on its own?

Yes, fruit can ferment on its own. But the results might not go to satisfy you at all!

However, how does it happen?

There needs a suitable condition for fermentation with yeast, bacteria, and sugar to activate the yeast, turning it into alcohol. Now, we all know that fruits are generous in sugar; and yeast is available in the fruit and in the air.

The sugar feeds the bacteria, giving them the energy to produce the desired flavor compounds while also providing the yeast sugar to convert into alcohol.

Therefore, for old or smashed fruits, natural fermentation begins effortlessly if the sugar comes in contact with bacteria and yeast.

Surprisingly, even non-alcoholic fruit can ferment on its own, producing very sour and undesirable byproducts. However, to avoid the tart taste, you can add a sweetener – sugar, honey, etc.

During the procedure, you can add sugar during or after the fermentation. However, keeping it out of the initial mix will help control the fermentation. And for better results, add some good yeast to your fruit juice.

Though naturally, fruit juice can undergo the chemical synthesis from surrounding bacteria, adding yeast speeds up the process efficiently.

How To Ferment Fruit?

How To Ferment Fruit

There are two main ways to ferment fruit: with yeast or bacteria.

Yeast fermentation is used to make alcoholic drinks like beer and wine. Bacteria fermentation is used to make food products like yogurt and cheese.

However, how can you ferment fruits?

The first step is to select the fruit that you want to ferment. Good choices include apples, pears, plums, apricots, and cherries. Avoid fruits with a high level of sugar, like bananas and pineapples.

The next step of fruit fermentation is to wash the fruit and cut it into small pieces. It will help the yeast break down the sugar in the fruit and turn it into alcohol. You can wash those by your hand or in a commercial dishwasher. Make all pieces small enough to fit through a food strainer so that the juice can be strained off and the solids discarded.

Once done with the first two steps of fruit fermentation, add water and sugar as the concluding step. It will help produce a carbonated drink as per your choice (both sweet and sour).

However, if you want to add your desired excipients, you can. Our favorite flavoring agent is cinnamon powder, which we recommend adding while intending to ferment any fruits. Close the container and leave it at room temperature for 2-3 days. After 2-3 days, taste the fruit juice and see how it is done.

Facts About Fruit Fermentation

Facts About Fruit Fermentation

Fermenting fruit is a simple process; however, a few factors can affect the taste and texture of the fruit, which must be considered before you begin.

Firstly, if your fruit is not ripe, it will not ferment well. You can ferment some under-ripe fruit, but the process will take much longer, resulting in a less flavorsome product.

Another important factor in fermentation is the acidity of the fruit. If the pH of the fruit is low, fermentation will speed up.

Also, ensure your fruit is clean! Smelly fruit will influence both taste and texture of the final fermented product.

Lastly, the type of sugar you use can also affect the end result. Brown sugar, honey, or molasses will add unique flavors and aromas to the fruit.

Experiment until you find a recipe that you love!

Can Fruit Ferment Without Yeast?

Can Fruit Ferment Without Yeast

The answer to this question is yes. Fermentation of fruit without yeast can happen spontaneously. This is due to natural yeasts on the fruit or in the air. The most common type of fermentation that occurs without yeast is alcohol fermentation.

Besides this, there are a few different ways that this can happen. One way is through the process of acetobacter, which is a type of bacteria. These bacteria will consume the natural sugars in the fruit and produce acetic acid or vinegar.

Another way that fruit can ferment without yeast is through lactic acid fermentation. This happens when the bacteria lactobacillus consumes the natural sugars in the fruit and produces lactic acid.

What Causes Fruit Juice To Ferment?

What Causes Fruit Juice To Ferment

It’s all about the conversion of natural sugar into alcohol by yeast. Again, the same things come; when you keep the juice for a prolonged time at an uncontrolled temperature, the fruit juice undergoes through chemical reaction termed fermentation.

Yeast comes into the juice (or added intentionally to faster the fermentation process) and survives by the sugar present naturally (sometimes intentionally included) in the fruit juice. The yeast feeds on the sugar and produces carbon dioxide and alcohol as a waste product.

The level of alcohol in the juice will depend on three factors-

  • The  type of yeast used
  • The amount of sugar in the juice
  • The temperature of the fermentation.

How Does Fruit Become Alcohol?

The fermentation process does it all!

When yeast is added to the fruit, the yeast eats the sugar in the fruit. As the yeast eats the sugar, it releases carbon dioxide and ethanol as the byproducts. And the carbon dioxide makes the drink fizzy. And the ethanol is what makes you drunk (alcohol).

Can Fruit Ferment Without Sugar?

We haven’t found a reliable source that says fruit can ferment without sugar, but theoretically, it could happen. Fact is, a sweetener will dramatically change the flavor of the end product, so you may or may not enjoy the taste.


  • Do Apples Ferment Naturally?

Yes, apples ferment naturally. Fermentation breaks down the sugar and starch (presence in the apple) into alcohol and carbon dioxide. The alcohol content of apple cider will depend on several factors, including the variety of apples, the amount of sugar in the juice, and the length of the fermentation process.

  • Do Oranges Ferment?

Yes, oranges ferment naturally. Due to the fermentation process, orange naturally produces carbon dioxide, alcohol, and acid. The acid causes the orange to taste sour and gives it its signature flavor.

  • Can Bananas Ferment?

Bananas can ferment on their own.

Bananas have a lot of natural sugar, so if they are left to ferment for a long time, the alcohol content will increase. However, though bananas can ferment, it is not a common occurrence. If bananas are overripe, the sugar will break down, and the yeast will ferment it. The result is a sweet, bubbly liquid that tastes like champagne.

  • Can Yogurt Ferment?

Yes, yogurt can ferment, and many people are doing so. Yogurt contains lactose, which feeds the bacteria, creating lactic acid, which adds to its tartness. The bacteria will also convert the milk proteins into tendons, creating a thick, gel-like texture within the yogurt.


There are answers to the question of how does fruit ferment naturally. One is through the yeast. Yeast is a type of fungus that feeds on sugar and produces carbon dioxide gas and alcohol. This is how beer, wine, and bread are made.

Another way fruit can ferment is through the action of bacteria. Bacteria can break down the sugar in the fruit to produce lactic acid, carbon dioxide, and ethanol. This is how sauerkraut, yogurt, and pickles are made.

And if you want to speed up the process, you can add external sugar and yeast as a speed enhancer!

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