Can Honey Go Off Archives » Swan Valley Honey

If you’ve ever wondered, “Can honey go off?”, the answer is no, pure honey doesn’t technically expire.

But that’s not the whole tale. Like, if honey can last for decades, or even centuries, so why do jars of it in supermarkets carry a best-before or expiry date? Can honey ever be hazardous to eat? And what happens if it isn’t saved correctly?

These are some of the most common questions people have about honey. In this guide, we’ll separate myths from facts and discuss the interesting science underlying honey’s long shelf life, when it can actually spoil, and how to store it correctly so it stays good for years to come.

Why Doesn’t Honey Expire? The Science Behind Nature’s Longest-Lasting Food

You must have heard about the famous examples from ancient Egypt that Archaeologists discovered sealed jars of honey inside Egyptian tombs that were over 3,000 years old. Surprisingly, the honey hadn’t decomposed.

This isn’t because honey contains artificial preservatives or additives. Instead, its remarkable shelf life comes from the unique way bees transform flower nectar into honey. In the process of manufacture, they turn common flower nectar into a food that is inherently hostile to bacteria, mould, yeast and practically every other microbe that causes food spoiling.

Think of honey as a substance with several natural defence mechanisms. If one barrier doesn’t block the microorganisms, the next one will. These barriers work together to prevent bacteria from living or multiplying.

Let’s understand in depth what exactly makes honey so difficult for microbes to invade.

1. Honey Contains Very Little Available Water

All live microorganisms need water.

Bacteria, mould and yeast need ‘free water’ to develop, to multiply and to break down food. Remove that available water, and their life cycle is done.

Although honey contains around 17–20% water, that number doesn’t tell the whole story.

A lot of the water in honey is securely bonded to the natural sugars and therefore not readily available. Food scientists assess this using a phenomenon called water activity (aw), the quantity of water microbes can use.

Pure honey has an exceptionally low water activity of around 0.5–0.65.

To give some perspective:

Most bacteria require a water activity greater than 0.90 to grow.

Most moulds and yeasts need at least 0.70.

Honey is much below both criteria. So while honey technically contains water, microbes can’t access enough of it to survive. This is one of the biggest reasons pure honey rarely ferments or spoils.

2. Its High Sugar Content Literally Dehydrates Microbes

Honey consists of approximately 80% natural sugars, namely fructose and glucose.

That high sugar content produces strong osmotic pressure.

A simple approach to think about it here.

When a bacterium enters honey, the surrounding sugar molecules start instantly to extract water from that cell. As the water exits the cell, it shrinks, dries out, and finally dies before it can replicate.

It is like putting a grape in a dehydrator. It slowly loses moisture and shrinks.

The exact same thing happens to microorganisms in honey.

This is why honey has been used for thousands of years as a natural preservative. Its high carbohydrates do not nourish bacteria; they work against them.

3. Honey Is Naturally Acidic

Another strong defence is honey’s acidity.

Nectar from fresh flowers is rather mild, with pH values between 5 and 7.

But, when the bees have converted the nectar into honey, the pH drops to around 3.2 to 4.5, around the same acidity as many fruits. This happens because bees add an enzyme called glucose oxidase, which converts part of the glucose into gluconic acid during the ripening process.

That acidic environment makes life extremely difficult for many harmful bacteria.

Microorganisms such as E. coli, Salmonella, Streptococcus and many other disease-causing bacteria grow best in near-neutral pH conditions. Honey’s naturally acidic environment prevents them from multiplying, providing still another level of protection against spoiling.

4. Bees Create a Natural Antibacterial Compound

Perhaps the most fascinating part of honey’s preservation happens because of the bees themselves. While processing nectar, bees add the enzyme glucose oxidase. This one enzyme does two things that are crucial.

First, it helps to make honey acidic by making gluconic acid. Second, it steadily makes little amounts of hydrogen peroxide.

Most people know hydrogen peroxide as a disinfectant used to clean cuts and wounds.

However, inside honey, it is released very slowly in very little amounts, thus it has a constant antibacterial effect without destroying the honey.

Interestingly, the protective effect can be increased by a small dilution of honey. The extra water turns on the enzyme, which makes more hydrogen peroxide at the exact moment when microbes would be more likely to proliferate.

It’s an incredibly smart natural defence mechanism.

5. Honey Contains Other Natural Protective Compounds

Scientists have discovered that honey’s preservation doesn’t stop with sugar, acidity, and hydrogen peroxide.

Honey also contains a range of naturally occurring compounds that further strengthen its antimicrobial properties.

These include:

Bee Defensin-1 is a peptide produced by bees that can destroy bacterial cell membranes.
Polyphenols and flavonoids, plant-derived antioxidants that help stabilise honey while contributing additional antimicrobial activity.
Methylglyoxal (MGO), a potent antibacterial chemical present at high concentrations in authentic Manuka honey, is the reason for its antimicrobial action, even when the hydrogen peroxide activity is diminished.

Every one of these substances adds another layer of protection, making honey one of the most naturally resistant foods known.

Why Does Honey Have a Best-Before Date if It Doesn’t Go Off?

If pure honey can last for years, why do supermarket jars still have a date printed on them?

The answer is not food safety but food labelling rules. In Australia, packaged foods including honey are normally required to have either a best before or use by date as per the Australia New Zealand Food Standards Code. Honey generally has a best-before date, which is an estimate of the time that the product will remain at its best quality when stored properly.

Unlike a use-by date, a best-before date doesn’t mean the honey is hazardous to eat after that date. In fact, it provides a reference for consumers to then know when the honey is likely to be at its greatest flavour, aroma, colour and texture.

Honey will alter in its natural state with time, even if stored properly. It can darken in colour, develop a deeper flavour, lose some of its delicate floral overtones or crystallise when the natural sugars rearrange themselves. These are normal indicators of ageing, not rotting. If the honey is pure and sealed and doesn’t have extra moisture or contamination, it will generally be fine to eat much past the indicated best-before date.

Best Ways to Store Honey So It Lasts for Years

Good storage preserves honey quality for as long as feasible.

Make sure the lid is tight after each usage.
Store at room temperature in a cool, dry cupboard.
Keep away from direct sunshine and heat sources.
Use a clean, dry spoon every time to avoid contamination.
Keep water out of the jar.
Unless absolutely necessary, don’t refrigerate, as cold temperatures accelerate crystallisation.

Experience Pure Western Australian Honey with Swan Valley Honey

The science behind honey’s remarkable shelf life only applies to genuine, pure honey. At Swan Valley Honey, we stay true to nature by offering:

Single-origin Western Australian honey harvested from pristine bushland.
Unprocessed and unheated honey to preserve its natural flavour and aroma.
Unique varieties including Jarrah, Karri, Redgum, Wildflower and more, each reflecting the native flowers our bees forage.

Explore our range of pure Western Australian honey

FAQs

Does Honey Lose Its Nutritional Value Over Time?

Pure honey is safe to eat for many years, although several heat-sensitive enzymes, antioxidants and aromatic compounds may slowly degrade over long-term storage, especially if exposed to heat or sunshine. Storing honey in a cool, dark place will help maintain its nutritional qualities and natural flavour for longer.

Do Different Types of Honey Have Different Shelf Lives?

Most pure honeys, such as Jarrah honey, have an extraordinarily extended shelf life due to their naturally low moisture, high sugar content and antibacterial qualities. Flavours, colours and crystallisation rates vary from variety to variety, but if properly preserved, real, high-quality honey can remain safe to eat for many years.

Can Expired Honey Make You Sick?

Not normally. A best-before date is a quality indication, not a safety indication. Pure honey, stored properly, is generally safe for a long time after this date. However, if you see any evidence of fermentation, foaming, a sour smell or if it grows mould, destroy the honey. These are signs of contamination, not age.

Why Does Honey Change Colour Over Time?

As honey ages, it will naturally darken due to gradual chemical reactions and oxidation. The colour is also affected by the floral source, the storage temperature and exposure to light. A darker appearance is not a symptom of spoilage, but is generally a typical sign of ageing.

Does Honey Absorb Moisture from the Air?

Yes. Honey is hygroscopic, which means it naturally collects moisture from the air. Too much water in it can make it more prone to fermentation if exposed or stored in a damp environment. That’s why the honey should be shut up tight after each usage.

Can You Freeze Honey to Extend Its Shelf Life?

Yes, honey can be frozen without becoming unsafe. But it is not essential to freeze it because pure honey has a very long shelf life. Store in an airtight container at room temperature to preserve its texture, flavour and quality.

Raw Honey vs Regular Honey: What’s the Difference?

Both raw honey and regular honey can last for years when pure and stored correctly. Raw honey is just lightly processed so that more of the natural enzymes, pollen and antioxidants are retained. Supermarket honey is generally filtered and cooked carefully to make it seem smoother and crystallise more slowly.