Most vegetables, melons, bananas, nuts, and many herbal teas fall on the low-acid or alkaline end of the spectrum. Whether you’re managing acid reflux or simply curious about what you’re eating, the answer depends on how you define “acidic,” because a food’s pH before you eat it and its effect on your body after digestion can be two very different things.
Two Ways to Measure Food Acidity
The pH scale runs from 1 (most acidic) to 14 (most alkaline), with 7 as neutral. In food science, anything with a pH below 4.6 is considered a high-acid food, while foods above 4.6 are classified as low-acid. This measurement tells you how acidic the food is on your tongue and in your stomach the moment you eat it.
There’s a second system called Potential Renal Acid Load (PRAL), which measures what happens after your body metabolizes a food. A positive PRAL score means the food leaves behind acid-forming residues that your kidneys need to filter. A negative score means it produces alkaline byproducts. A food can taste acidic going down yet have an alkalizing effect once digested, which is why the two scales sometimes give contradictory answers.
Fruits That Are Not Acidic
Most fruits are at least somewhat acidic, but several sit comfortably in the low-acid range with a pH of 5.0 or higher. Melons are the standout category. Honeydew ranges from 6.0 to 6.67, cantaloupe from 6.13 to 6.58, and watermelon from 5.18 to 5.60. Avocados are among the least acidic fruits of all, with a pH between 6.27 and 6.58.
Bananas fall in a broad range of 4.50 to 5.20, meaning a ripe banana is generally less acidic than a green one. Papayas (5.20 to 6.00), figs (5.05 to 5.98), and green mangoes (5.80 to 6.00) also qualify. Pears, on the other hand, are more acidic than many people assume, with Bartlett pears measuring 3.50 to 4.60.
If you’re looking for safe fruit choices for a sensitive stomach, melons, bananas, and avocados are your best options.
Vegetables: The Largest Low-Acid Category
Vegetables are, as a group, the least acidic foods you can eat. Most sit above pH 5.0, and many have negative PRAL scores, meaning they actively reduce your body’s acid load after digestion. Root vegetables like sweet potatoes, carrots, and beets are all low-acid. Green vegetables including asparagus, broccoli, green beans, and cauliflower fall into the same category.
High-water-content vegetables are particularly gentle. Celery, cucumber, and lettuce are almost entirely water with very little acid. These are frequently recommended for people dealing with reflux because they dilute stomach acid while adding virtually none of their own.
Grains, Beans, and Their Acid Load
This is where the pH-versus-PRAL distinction matters most. Grains are not particularly acidic by pH, but nearly all of them are acid-forming once your body processes them. White rice has a PRAL of 1.7 to 4.6, whole wheat bread scores 1.8, and white pasta comes in at 6.5. Oat flakes are surprisingly high at 10.7, and brown rice tops the grain list at 12.5. The more processed or protein-dense the grain product, the higher its acid-forming potential tends to be.
Legumes are a mixed bag. Green beans are genuinely alkalizing, with a PRAL of negative 3.1. Peas are nearly neutral at 1.2. Dried lentils, however, score 3.5 on the acid-forming side. If you’re trying to keep your overall diet on the alkaline end, green beans and fresh peas are better choices than dried legumes and heavy grain dishes.
Nuts, Dairy, and Other Neutral Foods
Nuts are considered alkaline foods and are commonly recommended as reflux-friendly snacks. They’re calorie-dense but low in acid, making them a useful protein source when you’re trying to avoid acidic options like processed meat.
Dairy is more complicated. Nonfat milk can temporarily buffer stomach acid, and low-fat yogurt offers the same soothing effect with added digestive benefits from its probiotic content. Full-fat dairy and aged cheeses, though, tend to be more acid-forming and can relax the valve between your stomach and esophagus, which is the opposite of what you want if reflux is your concern.
Beverages That Are Not Acidic
Plain water is the simplest non-acidic drink, sitting right at a neutral pH of 7.0. Herbal teas, particularly ginger and chamomile, are low-acid alternatives to coffee and regular tea. Ginger tea has the added benefit of being naturally anti-inflammatory and alkaline, which can ease digestive irritation.
A small amount of lemon juice in warm water, despite lemon’s obviously acidic taste, has an alkalizing effect once metabolized. The citric acid breaks down during digestion, and the remaining minerals (potassium, calcium, magnesium) reduce the acid load your kidneys handle. This is the classic example of a food that’s acidic by pH but alkaline by PRAL. Broth-based soups and coconut water are other gentle, low-acid options worth keeping in rotation.
Coffee, alcohol, carbonated drinks, and citrus juices are on the opposite end. If you’re choosing beverages specifically for their low acidity, water and herbal teas are the most reliable choices.
Why This Matters for Acid Reflux
The most common reason people search for non-acidic foods is acid reflux or GERD. Johns Hopkins Medicine groups reflux-friendly foods into three categories: high-fiber foods (whole grains, root vegetables, green vegetables), alkaline foods (bananas, melons, cauliflower, fennel, nuts), and high-water foods (celery, cucumber, lettuce, watermelon, broth-based soups). The overlap between these groups is significant, and building meals around them can meaningfully reduce reflux episodes.
The pattern is straightforward. Vegetables, melons, bananas, nuts, ginger, and water form the core of a low-acid diet. Grains and legumes are fine for most people in moderate amounts, even though they’re mildly acid-forming. The foods that cause the most trouble, both by pH and by their effect on digestion, are the ones most people already suspect: citrus, tomatoes, coffee, alcohol, fried food, and heavily processed meals.