Melons, bananas, and papayas are among the least acidic fruits you can eat, with pH levels well above 5.0. Most fruits fall on the acidic side of the pH scale, but a handful sit close to neutral, making them easier on your stomach, teeth, and digestive tract.
Every fruit contains some organic acid, so no fruit is truly neutral or alkaline in its raw form. But the differences between, say, a lemon (pH around 2.0) and a cantaloupe (pH above 6.0) are enormous. Understanding where common fruits land on this spectrum helps you make better choices if acidity is causing you problems.
How Fruit Acidity Is Measured
The pH scale runs from 0 (extremely acidic) to 14 (extremely alkaline), with 7.0 as neutral. Pure water sits at 7.0. Most fruits fall somewhere between 2.0 and 6.5, depending on how much organic acid they contain.
The two main acids in fruit are citric acid and malic acid. Together they account for the vast majority of the sour or tart taste you experience. Citric acid dominates in citrus fruits like oranges, lemons, and grapefruits. Malic acid is the primary acid in apples, peaches, and cherries. Grapes get their tartness from a third type, tartaric acid. Fruits that taste mild and sweet typically have lower concentrations of all three.
A pH of 4.6 is a meaningful dividing line. In food science, anything at or below 4.6 is classified as an acid food, while anything above it is considered low-acid. Most fruits people think of as “not acidic” have a pH above 5.0.
The Least Acidic Fruits
Melons consistently rank as the least acidic fruits available. Cantaloupe and honeydew both have a pH around 6.3, putting them remarkably close to neutral. Watermelon comes in slightly lower at about 5.4, which is still well above the acidic threshold. If you’re looking for the single safest fruit for a sensitive stomach, cantaloupe or honeydew is your best bet.
Bananas are another reliable low-acid option, especially when ripe. As bananas ripen, their starch converts to sugar and their acid content drops, making a yellow banana with brown spots less acidic than a firm green one. Ripe bananas generally sit in the 4.5 to 5.2 pH range.
Other fruits that fall on the lower end of the acidity spectrum include:
- Papaya: mild and naturally low in acid, with a pH typically above 5.0
- Avocado: technically a fruit, with a pH around 6.0 to 6.5, making it one of the least acidic options available
- Persimmons: sweet when ripe, with relatively low acid content
- Figs: pH around 5.0 to 5.5 when fresh and ripe
Coconut, while not always thought of as a fruit, also has very low acidity. Fresh coconut meat and coconut water both sit comfortably above pH 5.0.
Fruits That Seem Mild but Are Still Acidic
Some fruits taste gentle but are more acidic than you’d expect. Apples, for example, have a pH between 3.3 and 4.0 depending on the variety. They don’t taste sour because their sugar content masks the acid, but chemically, they’re solidly in the acidic range. The same applies to grapes (pH 3.5 to 4.5), pears (pH 3.5 to 4.6), and peaches (pH 3.3 to 4.0).
Berries are another category that catches people off guard. Strawberries, blueberries, and raspberries all have pH values below 4.0. Cherries fall in a similar range. Sweet varieties are slightly less acidic than tart ones, but none qualify as low-acid fruits.
The most acidic fruits are the ones you’d expect: lemons, limes, grapefruits, and oranges, all with pH values between 2.0 and 4.0. Pineapple and cranberries are similarly acidic. Tomatoes, which are botanically a fruit, sit around 4.0 to 4.5.
Why Acidity Matters for Acid Reflux
Citrus fruits and tomatoes are two of the most commonly reported triggers for acid reflux and GERD symptoms. The National Institute of Diabetes and Digestive and Kidney Diseases specifically identifies both as foods that can make symptoms worse. The acid in these fruits doesn’t cause reflux on its own, but it can irritate an already inflamed esophagus and intensify the burning sensation.
Johns Hopkins Medicine lists bananas, melons, and watermelon among the foods that are generally well tolerated by people with reflux. These foods have a higher pH and contain more water, which can help dilute stomach contents rather than aggravate them. If you’re managing reflux through diet, swapping your morning orange juice for sliced cantaloupe or banana is one of the simpler changes you can make.
Triggers vary from person to person, though. Some people tolerate moderately acidic fruits like apples or pears without any issues, while others find that even mildly acidic options cause discomfort. Keeping a food diary for a few weeks gives you more useful information than any generic list.
Acidity and Your Teeth
Tooth enamel begins to soften when exposed to anything below about pH 5.5. That puts most fruits in the danger zone for dental erosion, particularly citrus fruits, which can have a pH as low as 2.0. The American Dental Association highlights frequent consumption of fruit juices with pH values between 2.0 and 3.5 as a primary risk factor for erosion of tooth enamel.
Low-acid fruits like melons and bananas pose far less risk to your teeth. Their pH sits above or near the critical 5.5 threshold, so they don’t create the same acidic environment in your mouth. If you eat acidic fruits, waiting at least 30 minutes before brushing gives your saliva time to neutralize the acid and re-harden your enamel. Brushing immediately can spread the acid and accelerate erosion.
Does Drying or Cooking Change Acidity?
Drying fruit concentrates its sugars, but it also concentrates its acids. Research comparing fresh and dried versions of the same fruits found that the pH stayed in a similar range or dropped slightly after drying. A dried apricot isn’t meaningfully less acidic than a fresh one. The same goes for fruit chips and dehydrated fruit snacks.
Cooking fruit in water can dilute its acid content slightly, but the effect is modest. Canned fruits packed in syrup may taste less tart, but their pH usually stays in the same range as the fresh version. If you’re trying to reduce acidity in your diet, choosing naturally low-acid fruits matters more than how you prepare them.
Quick Reference by pH Range
- Lowest acidity (pH 5.0 and above): cantaloupe, honeydew, watermelon, banana (ripe), papaya, avocado, figs, coconut
- Moderate acidity (pH 3.5 to 5.0): apples, pears, peaches, grapes, mangoes, cherries, blueberries
- High acidity (pH below 3.5): lemons, limes, oranges, grapefruits, pineapple, cranberries, strawberries
Ripeness shifts pH noticeably. A green banana or an underripe mango will be more acidic than one that’s fully ripe. When choosing low-acid fruits, let them ripen completely before eating for the mildest flavor and lowest acid content.