The least acidic fruits are melons, bananas, avocados, and papayas. Cantaloupe and honeydew are the standouts, with pH values between 6.0 and 6.7, making them nearly neutral. Most fruits fall on the acidic side of the scale, but a solid handful sit above pH 4.5, the general cutoff between “acidic” and “low-acid” in food science.
The Lowest-Acid Fruits, Ranked
On the pH scale, 7.0 is neutral (pure water) and anything below that is acidic. The lower the number, the more acidic the fruit. Here are the fruits that stay closest to neutral:
- Honeydew melon: pH 6.0–6.67
- Cantaloupe: pH 6.13–6.58
- Avocado: pH 6.27–6.58
- Green mango: pH 5.80–6.00
- Papaya: pH 5.20–6.00
- Watermelon: pH 5.18–5.60
- Banana: pH 4.50–5.20
- Persimmon: pH 4.42–4.70
For comparison, some of the most acidic common fruits include grapefruit (pH 3.0–3.75), strawberries (pH 3.0–3.90), pineapple (pH 3.2–4.0), blueberries (pH 3.1–3.3), and apples (pH 3.3–4.0). Lemons and limes sit even lower, around pH 2.0–2.6.
Why Melons Are in a Class of Their Own
Cantaloupe, honeydew, and watermelon consistently rank as the least acidic fruits you can eat. Their pH values hover between 5.2 and 6.7, which is closer to milk than to orange juice. This is because melons have very high water content and low concentrations of the organic acids (citric acid and malic acid) that make most fruits taste tart.
Johns Hopkins Medicine specifically lists bananas, melons, and watermelon as good fruit choices for people managing acid reflux. Their low acidity means they’re unlikely to trigger heartburn or irritate an already sensitive esophagus.
Avocados: The Overlooked Low-Acid Fruit
Avocados are technically a fruit, and they’re one of the least acidic options available, with a pH of 6.27–6.58. Their near-neutral pH comes from having almost no citric or malic acid. Instead, their flavor profile is driven by fats, primarily oleic acid, which is the same heart-healthy monounsaturated fat found in olive oil. Oleic acid is a fatty acid, not the kind of fruit acid that causes a sour taste or irritates your stomach lining.
Why Ripeness Matters
A fruit’s pH isn’t fixed. It shifts as the fruit ripens, and the difference can be dramatic. Green (unripe) mangoes have a pH of 5.8–6.0, making them quite low in acid. But ripe mangoes drop to pH 3.4–4.8, overlapping with fruits like apples and cherries. This happens because the balance of sugars and acids changes as fruit matures. In many fruits, acidity decreases with ripening, but mangoes are unusual in that their measurable pH can actually drop as other chemical changes occur.
Bananas follow a more predictable pattern. Green bananas are more acidic and starchy, while ripe yellow bananas are milder, sitting in the 4.5–5.2 pH range. If you’re choosing fruit specifically for its low acidity, riper bananas are a better bet than underripe ones.
Fruits That Seem Mild but Aren’t
Some fruits taste sweet enough that you’d assume they’re low in acid, but their pH tells a different story. Apples have a pH of 3.3–4.0, firmly in the acidic range. The dominant acid in cultivated apples is malic acid, which can make up nearly 100% of their total organic acid content. You don’t always taste it because the sugar masks the sourness, but the acid is still there.
Cherries (pH 3.25–3.82), blueberries (pH 3.1–3.3), and grapes (pH 3.3–4.5) fall into the same category. They taste mild or sweet, but they carry enough acid to matter if you’re dealing with reflux or sensitive teeth.
What This Means for Your Teeth
Tooth enamel starts to break down at a pH of about 5.5. Any food or drink below that threshold can soften enamel over time, especially with repeated exposure. This means most fruits, even relatively mild ones like bananas at the lower end of their range, can contribute to enamel erosion if you eat them frequently throughout the day.
The safest choices for dental health are the fruits that sit above 5.5: cantaloupe, honeydew, avocado, papaya, watermelon, and green mango. Bananas straddle the line. If you’re eating more acidic fruits, drinking water afterward helps rinse the acid away. Waiting about 30 minutes before brushing gives your saliva time to remineralize the enamel rather than scrubbing it while it’s softened.
Dried and Processed Fruit Is More Acidic
Drying fruit concentrates everything in it, including its acids. When water evaporates, the organic acids that were spread through a juicy piece of fruit become packed into a smaller, denser form. Research comparing fresh and dried versions of the same fruits confirms that the drying process changes the acid concentration, even if the pH reading doesn’t always shift dramatically. A handful of dried mango or banana chips delivers more acid per bite than the same weight of fresh fruit.
Fruit juices present a similar problem. Juicing removes fiber and concentrates the liquid, giving the acid more direct contact with your teeth and stomach lining. If low acidity is your goal, whole fresh fruit is almost always the better choice over dried or juiced versions.
Choosing Low-Acid Fruits for Reflux
If acid reflux is why you’re searching for low-acid fruits, the practical shortlist is simple: watermelon, cantaloupe, honeydew, ripe bananas, and papaya. These are the fruits least likely to trigger symptoms. Avocados are also a strong option, with the added benefit of healthy fats that can help you feel full without irritating your digestive tract.
Fruits to be more cautious with include citrus (oranges, grapefruit, lemons), tomatoes (pH 4.3–4.9, which straddles the low-acid line but is a known reflux trigger), pineapple, and berries. These aren’t off-limits for everyone, but they’re the most common culprits when fruit worsens heartburn. Keeping a simple food log for a week or two can help you identify which specific fruits bother you, since individual tolerance varies widely.