Evidence-Based Nutrition Guide
Alkaline Foods: The Complete List for a Balanced Diet
Over 30 alkaline-forming foods with pH values, organised by category. Everything you need to build a mineral-rich, balanced diet.
12 min read · Updated March 2026 · Evidence-based
Alkaline foods are plant-based, mineral-rich foods that produce an alkaline (base-forming) effect in the body after digestion. These include most fruits, vegetables, nuts, seeds, and legumes. They are classified not by their pH before eating, but by the effect their mineral residue has on the body once metabolised.
Understanding which foods are alkaline-forming can help you build a nutrient-dense diet rich in essential minerals like calcium, magnesium, and potassium. If you are curious about the broader picture, our guide to the benefits of alkaline consumption explores how diet and hydration work together.
What Are Alkaline Foods?
The classification of foods as alkaline or acidic is based on the Potential Renal Acid Load (PRAL) model, developed by Remer and Manz in 1995. PRAL measures the acid or base-forming potential of a food based on its mineral and protein content, specifically the balance between acid-forming elements (phosphorus, sulphur from protein) and base-forming minerals (potassium, calcium, magnesium).
A food with a negative PRAL value is alkaline-forming. It leaves behind more base-forming minerals after metabolism. A food with a positive PRAL value is acid-forming. It produces more acid residue. The more negative the PRAL score, the more strongly alkaline-forming the food is.
This is why some foods that taste acidic are actually alkaline-forming. Lemons, for example, have a pH of about 2-3 (very acidic to taste), but their high potassium and low protein content give them a negative PRAL score of -2.5. Once the citric acid is metabolised, the alkaline minerals remain.
Key Point
The body maintains blood pH within a very tight range (7.35-7.45) regardless of diet. The value of alkaline-forming foods is not in changing blood pH but in providing mineral-dense, nutrient-rich whole foods that support a balanced diet and overall wellbeing.
Alkaline vs Acidic Food Chart
The chart below compares common foods by their PRAL (Potential Renal Acid Load) score. Negative values indicate alkaline-forming foods, while positive values indicate acid-forming foods. The further from zero, the stronger the effect.
| Food | Category | PRAL | Effect |
|---|---|---|---|
| Spinach | Vegetable | -11.8 | Strong Alkaline |
| Kale | Vegetable | -8.3 | Strong Alkaline |
| Swiss Chard | Vegetable | -8.1 | Strong Alkaline |
| Cucumber | Vegetable | -6.3 | Strong Alkaline |
| Raisins | Fruit | -21.0 | Strong Alkaline |
| Bananas | Fruit | -5.5 | Strong Alkaline |
| Avocado | Fruit | -4.8 | Moderate Alkaline |
| Sweet Potato | Vegetable | -4.3 | Moderate Alkaline |
| Celery | Vegetable | -5.2 | Moderate Alkaline |
| Watermelon | Fruit | -1.9 | Moderate Alkaline |
| Almonds | Nut | -2.2 | Moderate Alkaline |
| Broccoli | Vegetable | -1.2 | Mild Alkaline |
| Bell Pepper | Vegetable | -1.4 | Mild Alkaline |
| Olive Oil | Fat/Oil | 0.0 | Neutral |
| Butter | Dairy | +0.6 | Neutral |
| White Rice | Grain | +4.6 | Mild Acid |
| Whole Wheat Bread | Grain | +1.8 | Mild Acid |
| Chicken Breast | Meat | +8.7 | Moderate Acid |
| Beef | Meat | +7.8 | Strong Acid |
| Cheddar Cheese | Dairy | +26.4 | Strong Acid |
Source: PRAL values based on Remer T, Manz F (1995). Potential renal acid load of foods and its influence on urine pH. Journal of the American Dietetic Association. USDA FoodData Central.
Alkaline Fruits
Fruits are some of the most accessible alkaline-forming foods. Despite their natural sugars and sometimes acidic taste, most fruits have a negative PRAL score due to their high mineral content, particularly potassium, magnesium, and calcium.
Lemons & Limes
Despite being citrus fruits with a low pH, lemons and limes are strongly alkaline-forming after metabolism. Rich in vitamin C, they are one of the simplest alkaline additions to any diet.
Bananas
One of the most alkaline common fruits. Bananas provide 358mg of potassium per medium fruit, which plays a direct role in acid-base balance. A convenient, affordable alkaline snack.
Watermelon
At 92% water content, watermelon is both hydrating and alkaline-forming. It provides lycopene (a powerful carotenoid), vitamin C, and potassium. An excellent summer fruit in South Africa.
Avocado
Technically a fruit, avocados are rich in monounsaturated fats and provide 485mg of potassium per 100g, more than bananas. Their healthy fat content also supports nutrient absorption from other alkaline foods.
Raisins
The most alkaline-forming common food by PRAL score. Raisins are concentrated sources of potassium and iron. Their extreme alkalinity comes from the concentration of minerals during the drying process.
Apples
A widely available alkaline fruit rich in quercetin (a flavonoid), pectin (soluble fibre), and vitamin C. The old saying about an apple a day has some basis in its broad nutritional profile.
Mangoes
Rich in vitamin A, vitamin C, and folate. Mangoes are a moderately alkaline-forming tropical fruit that is especially popular during the South African summer months.
Grapes
Contain resveratrol, a polyphenol studied for its potential cardiovascular benefits. South Africa is one of the world's top grape producers, making them a readily available alkaline fruit option.
Oranges
Like lemons, oranges are alkaline-forming despite their citric acid content. They provide vitamin C, folate, and potassium. Fresh-squeezed orange juice retains most of the alkaline-forming minerals.
Pineapple
Contains bromelain, a group of enzymes unique to pineapple. Also provides manganese and vitamin C. Pineapple is mildly alkaline-forming and adds tropical flavour to smoothies and meals.
Alkaline Vegetables
Vegetables are the most consistently alkaline food group. Nearly every vegetable has a negative PRAL score, making them the foundation of an alkaline-rich diet. Leafy greens are particularly potent due to their high mineral content relative to protein.
Spinach
The most alkaline common vegetable by PRAL score. Spinach is rich in calcium, magnesium, potassium, iron, and vitamins A and K. Its exceptional mineral density makes it a cornerstone of any alkaline-focused diet.
Kale
A cruciferous vegetable packed with vitamins C, K, and A, plus calcium. Kale is one of the most nutrient-dense foods available and strongly alkaline-forming.
Cucumber
At 96% water content, cucumber is one of the most hydrating foods you can eat. It provides vitamin K and potassium, making it both alkaline-forming and excellent for hydration.
Celery
With 95% water content, celery is another highly hydrating alkaline vegetable. It provides potassium and vitamin K. Celery juice has become popular, though the whole vegetable provides more fibre.
Sweet Potato
An excellent source of beta-carotene, potassium, and fibre. Sweet potatoes are a popular staple in South African cuisine and serve as an alkaline alternative to white potatoes and grains.
Broccoli
Contains sulforaphane, a compound studied for its potential protective properties. Broccoli provides vitamins C and K, folate, and fibre. It is mildly alkaline-forming and versatile in cooking.
Bell Peppers
All colours of bell pepper are alkaline-forming. Red bell peppers have the highest vitamin C content of any common vegetable, more than twice that of oranges by weight.
Beetroot
Rich in folate, manganese, potassium, and dietary nitrates. Beetroot is moderately alkaline-forming and popular in South African salads and juices.
Carrots
An excellent source of beta-carotene (which the body converts to vitamin A), fibre, and vitamin K. Carrots are moderately alkaline-forming and one of the most widely consumed vegetables.
Cauliflower
A versatile cruciferous vegetable providing vitamin C, vitamin K, and choline. Cauliflower is mildly alkaline-forming and has gained popularity as a low-carb substitute for grains and potatoes.
Garlic
Known for its allicin and organosulphur compounds, garlic is a staple in South African cooking. It is mildly alkaline-forming and adds flavour without adding significant acid load to meals.
Tomatoes
Rich in lycopene (especially when cooked), vitamin C, and potassium. Despite tasting acidic, tomatoes are moderately alkaline-forming. They feature prominently in South African braai sides and stews.
Alkaline Nuts & Seeds
Most nuts and seeds are either mildly alkaline or close to neutral on the PRAL scale. While many common nuts like cashews and peanuts are slightly acid-forming, the options below lean alkaline and provide valuable minerals, healthy fats, and plant-based protein.
Almonds
The most alkaline tree nut. Almonds provide vitamin E and 268mg of magnesium per 100g. They are one of the few nuts with a clearly negative PRAL score, making them an excellent alkaline snack.
Chestnuts
Unique among nuts for being lower in fat and higher in carbohydrates. Chestnuts provide vitamin C and fibre. Their negative PRAL makes them one of the most alkaline-forming nuts available.
Pumpkin Seeds
Rich in magnesium, zinc, and iron. Pumpkin seeds are nearly neutral on the PRAL scale, leaning slightly alkaline. They make a nutritious topping for salads and smoothie bowls.
Sesame Seeds
Contain an impressive 975mg of calcium per 100g, one of the highest non-dairy calcium sources. Sesame seeds are nearly neutral, making them a safe addition to an alkaline diet.
Alkaline Legumes
Legumes are notable because they provide substantial protein while remaining alkaline-forming. Most animal proteins are acid-forming, so legumes offer a valuable alternative for those seeking to increase alkaline food intake without sacrificing protein.
Lentils
A staple plant protein providing folate, iron, and fibre. Cooked lentils are mildly alkaline-forming, making them one of the best protein sources for an alkaline-focused diet.
Lima Beans
Rich in potassium, iron, and manganese. Lima beans are a traditional staple in South African cuisine and one of the more alkaline-forming legumes available.
Chickpeas
Versatile and protein-rich, chickpeas are the base for hummus and feature in curries, salads, and stews. They are mildly alkaline-forming and an excellent source of fibre.
Soybeans / Edamame
With 18g of protein per 100g, soybeans are one of the most protein-dense alkaline foods. They also contain isoflavones, a group of phytonutrients studied for various health associations.
Alkaline Herbs & Spices
Herbs and spices are surprisingly potent alkaline-forming foods. While consumed in smaller quantities than vegetables or fruits, their PRAL values per 100g are often among the most alkaline of any food category. Adding fresh herbs to meals is one of the simplest ways to increase alkaline intake.
Parsley
One of the most alkaline foods of any category. Parsley is rich in vitamin K, vitamin C, and iron. Even small amounts added to dishes contribute meaningful alkalinity.
Basil
Provides vitamin K and manganese. Basil is strongly alkaline-forming and a staple in Mediterranean and Thai cooking. Fresh basil adds both flavour and alkaline value to meals.
Coriander / Cilantro
Rich in vitamins A and K. Coriander is widely used in South African cooking, particularly in Cape Malay and Indian-influenced dishes. It is moderately alkaline-forming.
Ginger
Contains gingerol, its primary bioactive compound. Ginger is used in cooking, teas, and traditional remedies across South Africa. It is mildly alkaline-forming.
Turmeric
Contains curcumin, studied extensively for its biological properties. Turmeric is a key ingredient in South African curries and is moderately alkaline-forming.
Mint
Rich in vitamin A and manganese. Mint is strongly alkaline-forming and makes an excellent base for alkaline teas. It pairs well with lemon water for a refreshing alkaline drink.
How to Add More Alkaline Foods to Your Diet
Shifting toward a more alkaline diet does not require dramatic changes. Small, consistent adjustments compound over time. Here are seven practical steps you can start with today.
Start Every Meal With Vegetables
Fill half your plate with alkaline vegetables before adding protein or grains. This simple habit ensures a strong alkaline base at every meal and increases your overall vegetable intake naturally.
Keep Alkaline Snacks Within Reach
Stock almonds, bananas, raisins, and sliced cucumber for quick alkaline snacking. Having these ready to eat reduces the temptation to reach for acid-forming processed snacks.
Add Greens to Smoothies
Blend spinach or kale into fruit smoothies. The fruit flavour masks the greens, and you get the alkaline benefits of leafy vegetables in a convenient, drinkable form.
Use Herbs Generously
Fresh parsley (PRAL -12.0), basil (-7.3), and coriander (-5.4) are among the most alkaline foods. Add them liberally to finished dishes, salads, and soups to boost alkaline intake with minimal effort.
Swap Grains for Root Vegetables
Replace white rice (PRAL +4.6) with sweet potato (PRAL -4.3) as a side dish. This single swap moves you from acid-forming to alkaline-forming, a net shift of nearly 9 PRAL points per serving.
Start Your Day With Lemon Water
A glass of warm water with fresh lemon juice is alkaline-forming, hydrating, and provides vitamin C. It is a simple morning routine that sets an alkaline tone for the rest of the day.
Aim for the 80/20 Guideline
Target roughly 80% alkaline-forming and 20% acid-forming foods in your daily diet. This is not about perfection but about consistently choosing more vegetables, fruits, and plant-based foods across your meals.
Alkaline Foods and Hydration
Many of the most alkaline foods are also among the most hydrating. Cucumber (96% water), celery (95% water), and watermelon (92% water) contribute meaningful fluid intake alongside their alkaline minerals. In South Africa’s warm climate, these foods serve double duty, keeping you hydrated while supporting mineral-rich nutrition.
Hydration and alkaline balance are closely connected. Water is the primary medium through which the body manages acid-base balance, and adequate fluid intake supports the kidneys in maintaining pH homeostasis. Pairing alkaline-rich foods with alkaline water provides both hydration and complementary mineral intake.
Research supports the relationship between hydration and mineral balance. Weidman et al. (2016) in the Journal of the International Society of Sports Nutrition found that alkaline water improved hydration status and blood viscosity after exercise. Koufman and Johnston (2012) in the Annals of Otology, Rhinology & Laryngology demonstrated that alkaline water with a pH of 8.8 irreversibly inactivated pepsin, suggesting potential benefits for acid-related conditions.
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Frequently Asked Questions About Alkaline Foods
Key Takeaways
- Alkaline foods are classified by their PRAL (Potential Renal Acid Load) score, not by their taste or pH before eating.
- Leafy greens are the strongest alkaline vegetables, with spinach at -11.8 and kale at -8.3. Raisins lead all common foods at -21.0.
- A balanced diet of roughly 70-80% alkaline-forming and 20-30% acid-forming foods is recommended for optimal nutrition.
- Hydration matters. Pair alkaline foods with alkaline water to support both mineral intake and fluid balance.
- Small changes compound. Start with lemon water in the morning, swap starches for root vegetables, and add greens to every meal.
Sources
- Remer T, Manz F. Potential renal acid load of foods and its influence on urine pH. Journal of the American Dietetic Association. 1995;95(7):791-797.
- Weidman J, Holsworth RE Jr, Brossman B, Cho DJ, St Cyr J, Fridman G. Effect of electrolyzed high-pH alkaline water on blood viscosity in healthy adults. Journal of the International Society of Sports Nutrition. 2016;13:45.
- Koufman JA, Johnston N. Potential benefits of pH 8.8 alkaline drinking water as an adjunct in the treatment of reflux disease. Annals of Otology, Rhinology & Laryngology. 2012;121(7):431-434.
- U.S. Department of Agriculture. FoodData Central. USDA Agricultural Research Service. Available at: fdc.nal.usda.gov.
- Schwalfenberg GK. The alkaline diet: Is there evidence that an alkaline pH diet benefits health? Journal of Environmental and Public Health. 2012;2012:727630.
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