Most fruits, many beverages, and several common condiments are acidic, meaning they have a pH below 7.0. The scale runs from 0 (most acidic) to 14 (most alkaline), with 7.0 being neutral. Knowing which foods fall on the acidic end matters for two practical reasons: protecting your tooth enamel and managing acid reflux.
How pH Works in Food
The pH scale is logarithmic, so each whole number represents a tenfold difference in acidity. A food with a pH of 3.0 is ten times more acidic than one at 4.0, and a hundred times more acidic than one at 5.0. Pure water sits at 7.0. Your stomach acid hovers around 1.5 to 3.5, which is why most foods feel mild by comparison, but even moderately acidic foods can affect your teeth and esophagus over time.
Fruits: The Most Acidic Whole Foods
Citrus fruits and berries top the list. Lemon juice registers between 2.0 and 2.6, and lime juice is similar at 2.0 to 2.35. These are among the most acidic things you’ll find in a kitchen. Grapefruit falls between 3.0 and 3.75, and orange juice between 3.3 and 4.15.
Berries are surprisingly acidic too. Blueberries from Maine measure 3.12 to 3.33, raspberries 3.22 to 3.95, and strawberries 3.0 to 3.9. Concord grapes are particularly low at 2.8 to 3.0.
Other common fruits land in a similar range: apples at 3.3 to 4.0, pineapple at 3.2 to 4.0, peaches at 3.3 to 4.05, and mangoes at 3.4 to 4.8. The few fruits that sit closer to neutral are bananas (4.5 to 5.2), watermelon (5.18 to 5.6), and cantaloupe (6.13 to 6.58).
Vegetables Are Mostly Mild
Most vegetables hover in the slightly acidic to near-neutral range, between 5.0 and 7.0. Broccoli sits at 6.3 to 6.85, asparagus at 6.0 to 6.7, and carrots at 5.88 to 6.40. These are low enough in acidity that they rarely cause issues for teeth or digestion.
The big exception is tomatoes. With a pH of 4.3 to 4.9 (and tomato juice at 4.1 to 4.6), tomatoes are noticeably more acidic than other vegetables. This is why tomato-based sauces are a well-known heartburn trigger. Eggplant (4.5 to 5.3) and pickles (3.2 to 3.7) also lean more acidic, though pickles get their low pH from the vinegar brine rather than the cucumber itself.
Beverages Are Often More Acidic Than You’d Expect
Soft drinks are some of the most acidic items in the average diet. Coca-Cola Classic measures around 2.50, Pepsi around 2.53, and RC Cola at 2.38. These are more acidic than orange juice. Even sodas that don’t taste particularly tart are acidic: Dr. Pepper comes in at 2.89 and Sprite at 3.29. Diet versions aren’t much better. Diet Coke registers at 3.28 to 3.65 depending on the variety.
Root beers are the notable exception, sitting higher at 4.0 to 4.75, making them the least acidic sodas by a wide margin.
Sports and energy drinks fall right in line with soft drinks. Gatorade varieties range from 2.92 to 3.27, Powerade Red sits at 2.77, Red Bull at 3.37, and 5-Hour Energy at 2.81. Fruit juices are similarly acidic: Welch’s Concord Grape measures 3.24, Minute Maid Orange Juice 3.70, and cranberry juice blends can dip below 3.0.
Coffee is milder than most people assume. Regardless of roast level, brewed coffee typically falls between 5.15 and 5.45. Dark roasts, light roasts, and even products marketed as “low acid” all cluster in this narrow range. The perceived brightness or sharpness of a light roast doesn’t necessarily mean it has a lower pH.
Condiments and Fermented Foods
Vinegar is inherently acidic, ranging from 2.4 to 3.4, which is why it’s used as a preservative. Cider vinegar is slightly milder at around 3.1. Ketchup, essentially a vinegar-and-tomato product, sits at 3.89 to 3.92. Fruit jams range from 3.5 to 4.5, and fruit jellies from 3.0 to 3.5.
Sauerkraut, which gets its tang from lactic acid fermentation, measures 3.3 to 3.6. Dill pickles land at 3.2 to 3.7. These fermented foods are firmly in the acidic category.
Why Acidity Matters for Your Teeth
Tooth enamel begins to dissolve at around pH 5.5. Every fruit, soda, sports drink, and condiment listed above falls well below that threshold. At pH 4.0, studies using X-ray imaging show complete mineral loss in enamel over a three-week exposure period.
This doesn’t mean you need to avoid acidic foods entirely. What matters is how long your teeth are exposed. Sipping a soda over two hours does far more damage than drinking it in ten minutes. Swishing water afterward helps neutralize the acid. Dentists generally recommend waiting at least 30 minutes after eating acidic foods before brushing, since your softened enamel is more vulnerable to abrasion right after acid exposure.
How Acidic Foods Affect Acid Reflux
If you experience heartburn, the pH of your food is only part of the picture. Your lower esophageal sphincter, the muscular ring between your esophagus and stomach, normally stays closed to keep stomach acid where it belongs. Certain foods cause this sphincter to relax, allowing acid to push upward. Foods with a low pH are more likely to trigger reflux, but fatty foods, chocolate, and alcohol also relax the sphincter through different mechanisms.
Tomatoes and citrus are the most commonly reported food triggers. Nonfat milk can act as a temporary buffer between stomach acid and the stomach lining, offering short-term relief. Swapping tomato-based sauces for pesto or olive oil-based alternatives, and choosing bananas, melons, or pears over citrus, reduces acid exposure without eliminating fruits and vegetables from your diet.
Reducing Acidity in Cooking
You can lower the acidity of tomato sauce with a small amount of baking soda. Start with a quarter teaspoon per cup of sauce, stir it in while heating, and taste before adding more. Baking soda directly neutralizes acid, so a little goes a long way. Too much will make the sauce taste soapy. If the sauce still tastes sharp after that, swirling in a teaspoon of butter rounds out the flavor further.
Dilution is another simple approach. Adding broth or water to soups and stews lowers the overall acid concentration. Roasting tomatoes before adding them to a dish also reduces their perceived acidity by caramelizing their sugars, though the actual pH change is modest.
A Food’s pH Isn’t the Whole Story
There’s an important distinction between how acidic a food is on your plate and what it does inside your body. Your kidneys and lungs tightly regulate blood pH between 7.35 and 7.45 regardless of what you eat. The “alkaline diet” concept is based on the idea that certain foods leave behind acidic or alkaline residues after digestion, but this effect shows up only in urine pH, not blood pH.
Nutritional researchers measure this using a score called the potential renal acid load, which accounts for a food’s mineral and protein content, intestinal absorption rates, and sulfur metabolism. By this measure, meat, cheese, and grains produce an acidic load in the body despite not tasting acidic at all, while lemons and oranges, despite their low pH, leave an alkaline residue because of their high mineral content. So a food’s pH on the plate and its metabolic effect are two entirely different things. For practical purposes like dental health and reflux, the pH of the food itself is what matters. For broader dietary balance, the metabolic picture is more relevant.