Are Blueberries Acidic?

Blueberries are one of my favorite fruits to snack on or add to recipes. Their sweet, tangy flavor pairs well with both savory and sweet dishes. As delicious as they are, blueberries are acidic. Their acidity levels can cause problems for people with acid reflux or other conditions requiring a low-acid diet.

In this article, I’ll take a close look at the acidity of blueberries – from fresh to frozen to jam. I’ll also provide tips on how to reduce their acidity and answer some common questions related to consuming this nutritious and tasty fruit.

Introduction to Blueberries and Their Acidity

Blueberries are native to North America and have been enjoyed for centuries, both fresh and preserved in foods like pemmican. Today, they are popular around the world, praised for their sweet flavor and numerous health benefits.

Blueberries contain significant levels of antioxidants, which are linked to reducing inflammation, protecting the heart and brain, and even warding off cancer. They also provide dietary fiber, vitamin C, manganese, and other essential nutrients.

With all these benefits, it may seem surprising that blueberries are one of the more acidic fruits. Their pH levels range from 3.1 to 3.3, making them more acidic than lemons!

The high acidity comes from the citric, malic, and ascorbic acids naturally present in blueberries. The exact acidity depends on the type of blueberry, its ripeness, and other environmental factors.

So why are these healthy berries so tart and acidic? And how does this affect whether or not you should eat them? Let’s find out.

Factors that Determine the Acidity Levels in Blueberries

Multiple factors influence the acidity levels in blueberries, causing some variation in just how tart they taste. These include:

  • Type of blueberry – There are several types like highbush, lowbush, rabbiteye, and more. Each has slightly different acidity.
  • Ripeness – Unripe blueberries tend to be more acidic. As they ripen, acidity decreases slightly.
  • Growing conditions – Climate, soil composition, and other environmental factors impact acidity.
  • Storage and processing – Freezing, drying, or cooking blueberries affects their pH levels.

Of these, the variety and ripeness have the greatest effect on acidity. For example, wild lowbush blueberries tend to be more acidic than cultivated highbush types. And fully ripe blueberries are less tart than unripe ones.

When buying blueberries, select plump, deeply colored berries to get optimal flavor and lower acidity levels.

Can Blueberries Cause Problems for Those with Acid Reflux?

With an acidic pH similar to lemon juice, it’s understandable that many people with acid reflux avoid blueberries. However, despite their tart flavor, blueberries may not be as bothersome as some other acidic foods.

Blueberries contain minerals like magnesium and potassium that can help neutralize stomach acid. Their fiber content also helps reduce reflux.

However, consuming large amounts of blueberries, especially on an empty stomach, could still trigger symptoms like heartburn. To avoid problems, eat blueberries in moderation and not as a snack by themselves.

Enjoy about 1 cup daily, and be sure to combine them with more alkaline foods like leafy greens, squash, or oatmeal. This helps balance the pH levels. Pay attention to your own tolerance level as well.

Overall, blueberries are one of the better fruit options for those prone to acid reflux. Just consume them cautiously and avoid overindulging.

Tips for Reducing the Acidity of Blueberries

If you want to enjoy the benefits of blueberries but reduce their tart taste and acidity, there are a few options:

  • Rinse berries – A quick soak and rinse with water can help remove some excess acids on the surface.
  • Pair with alkaline foods – Combining blueberries with non-acidic foods helps balance their acidity. Yogurt, leafy greens, bananas, and nuts are smart choices.
  • Sweeten with low-acid ingredients – A small amount of maple syrup, coconut sugar, or stevia can complement the tartness. Avoid high-sugar jams or syrups.
  • Use baking soda – An alkaline substance, baking soda can neutralize acids. Rinsing berries with a diluted baking soda solution reduces tartness.
  • Cook or heat them – Heat helps break down acidity. Try gently steaming, baking, or microwaving blueberries.

With a few minor adjustments, you can enjoy the nutrition of blueberries while avoiding any strong acidic bite.

How Does the Acidity of Blueberry Jam Compare?

Putting the natural tartness of blueberries aside, many wonder how the acidity of blueberry jam compares. There are a few factors that affect the pH levels in this classic preserve:

  • Added sugar – To help the berries gel, extra sugar or sweeteners raise jam’s acidity.
  • Pectin – This gelling agent can be naturally acidic too. Some jams include added pectin.
  • Preservatives – Ingredients like citric acid are often added to store-bought jams.

The bottom line is that blueberry jam is more acidic than fresh blueberries. Store-bought versions tend to be the most acidic and sweet, with extra sugars and additives.

To get a less acidic blueberry jam, consider making your own. You control how many berries and the amount of sugar added. Opt for limited sugar and no extra preservatives whenever possible.

Does Blueberry Juice Have High Acidity Like the Whole Fruit?

Pressed straight from fresh, ripe blueberries, juice captures their sweet and tart flavors. However, blueberry juice tends to be even more acidic than the whole berries.

There are two reasons for this:

1. Lack of fiber – Fiber helps slow digestion, which subsequently slows the rate at which berry acids are absorbed. Juice eliminates that beneficial fiber.

2. Added sugars – Many store-bought juices contain extra sweeteners, bumping up acidity.

To keep acid levels in check, either make your own blueberry juice or read labels carefully. Look for brands with minimal added sugars and preservatives. Diluting concentrated juice with water can help as well.

As with eating the berries themselves, it’s best to drink blueberry juice in moderation to avoid upsetting your stomach.

Frequently Asked Questions About Blueberry Acidity

Are all berries acidic?

Yes, most berries are acidic due to the presence of citric and malic acids, including raspberries, blackberries, and strawberries. Their pH levels range from around 2.5 to 4.

How long do fresh blueberries last?

When stored in the refrigerator, fresh blueberries typically last 1-2 weeks. Rinse them gently before storing and keep them in a breathable container. Frozen blueberries can last up to 10 months in the freezer.

What’s the best way to freeze blueberries?

First, gently wash and pat dry fresh blueberries. Arrange them in a single layer on a baking sheet and place in the freezer until solid, then transfer to an airtight freezer bag. They’ll keep for up to 10 months.


While blueberries are undeniably acidic, don’t write them off completely. Enjoyed in moderation, their nutrition still outweighs concerns about acidity for most people. Just pay attention to your own tolerance.

Combine blueberries with more alkaline foods, reduce added sugars, and control portion sizes. This allows you to gain their antioxidant power and flavor. With a few adjustments, their acids shouldn’t prevent you from reaping the many perks of blueberries.

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