Introduction to the cashew: the nut that is also a fruit
El cashew (Anacardium occidentale) is a fascinating food both for its nutritional properties and for its extraordinary botanical rarity: it is a nut that grows attached to a fresh fruit, a natural peculiarity that distinguishes it from other more popular nuts. Furthermore, the cashew is known in different countries under multiple names, such as marañón, cajú, merey, nuez de la India, cajuil, or pepa, which reflects its cultural and culinary influence in Latin America, Asia, and Africa.
Origin, distribution and botany of the cashew nut
The cashew nut is native to South America, especially northeastern Brazil, southern Venezuela, and parts of Colombia. Since its discovery, the portuguese colonizers They introduced the tree to Africa and Asia, where its culture has expanded rapidly and has acquired key economic importance in countries such as India, Vietnam, Nigeria and Mozambique. For more information on different types of nuts and its properties, you can consult our section dedicated to it.
The cashew tree is perennial and usually reaches between 6 and 12 meters high, although in exceptional conditions it can reach up to 20 meters. Its trunk is generally irregular, branches low, and develops a wide crown that is wider than it is tall. Its alternate, oblong leaves have a bright green upper surface, while the flowers grow in corymbs and are small, fragrant, and white, pink, or violet.
Fruit structure
The cashew produces a curious fleshy "false fruit" known as cashew apple, yellow, orange or reddish in color, highly appreciated in Latin America for its sweet flavor and its use in making juices, wines, jams or jellies. Attached to this "apple" is the cashew nut, kidney-shaped, containing the edible seed. The shell of this nut is highly toxic, as it contains urushiol, which is why every cashew sold on the market has been heat-treated before consumption. If you'd like to learn more about the plants that produce nuts, check out our section on what is a dried fruit you will be able to find useful information.
Nutritional properties of cashews: a treasure for health
Cashew is one of the most nutritionally complete nuts, which makes it a star food in balanced diets and a particularly popular option among vegetarians and vegans.
- Caloric intake: A 100-gram serving of natural cashews provides between 550 and 577 kcal, primarily due to their richness in healthy fats and complex carbohydrates.
- Healthy fats: They contain between 40 and 45% fat, most of which is unsaturated (especially monounsaturated fats such as oleic acid and polyunsaturated fats such as Omega-6), which promote cardiovascular health by reducing LDL cholesterol levels and increasing HDL cholesterol.
- High-quality vegetable proteins: Cashews provide between 15% and 18% of protein, with an excellent balance of amino acids for the body and a particular richness in tryptophan, a precursor of serotonin.
- Complex carbohydrates: About 30% of its weight. Their low simple sugar content and relatively low glycemic index make them suitable for people looking to control their blood glucose.
- Fiber: Between 2,5 and 3 grams per 100 grams, which promotes satiety and intestinal transit.
- Vitamins: Rich in group B (B1, B2, B6 and folic acid), vitamin E and small amounts of vitamin K.
- Minerals: They stand out for their content of magnesium, phosphorus, copper, zinc, iron, selenium, potassium and a small amount of calcium.
Nutritional composition (per 100 g):
| Composition: | Quantity |
|---|---|
| Sustainable | 553-577 calories |
| Proteins | 15-18 g |
| Fats | 40-45 g |
| Carbohydrates | 30 g |
| Fiber | 2,5-3 g |
| Magnesium | 270-292 mg |
| Phosphorus | 470-593 mg |
| Zinc | 5,8 mg |
| Iron | 2,8-6,7 mg |
| Selenium | 0,6-10 mg |
| Vitamin E | 0,9 mg |
| Vitamin B1 | 0,63 mg |
| Vitamin B2 | 0,26 mg |
| Vitamin B3 (niacin) | 1,06-6,98 mg |
The cashew nut is, thus, a Excellent source of energy, protein, essential fatty acids, antioxidants, vitamins and minerals key to metabolic, cardiovascular, bone, brain and immune health.
Main benefits of consuming cashews
- Cardiovascular health: Its lipid profile (unsaturated fatty acids, phytosterols and tocopherols) is ideal for lower cholesterol and triglyceridesThey also reduce the risk of heart disease.
- Fortalecimiento oseo: The abundance of magnesium, phosphorus and calcium favors the bone and tooth health.
- Brain function and nervous system: Its vitamin E, B6, and zinc content helps prevent cognitive decline. Tryptophan is essential for the production of serotonin, contributing to an improvement in mood, sleep and relaxation.
- Immune booster: Zinc, selenium, and vitamin E promote protection against infections, free radicals, and abnormal cells.
- Weight control: Despite its caloric density, the high satiating power of the combination of protein, fat, and fiber helps control appetite and avoid low-quality snacking.
- Blood sugar regulation: Their low glycemic index and high fiber content make them useful for people with diabetes or insulin resistance.
- digestive health: Its fiber supports intestinal transit and improves the microbiota.
- They promote the maintenance of skin, hair and nails: Due to their richness in zinc, copper, and antioxidants, they improve the appearance and health of the skin and connective tissues.
- Additional metabolic benefits: Prevention of osteoporosis, support of thyroid function, and regulation of blood pressure.
Cashew in traditional medicine and therapeutic applications
- Different parts of the cashew tree have been used in traditional medicine in their countries of origin: leaves They are used to reduce blood glucose, Cortex in infusion for wounds and infections, and the fresh fruit as an antidiarrheal and restorative remedy.
- Its content in phenolic antioxidants (anacardic acids, cardanols, tocopherols) gives it properties anti-inflammatory and antibacterialThe compounds present in the seed and shell have shown positive effects in studies for cardiovascular health and the inhibition of chronic inflammatory processes. For more details on medicinal plants, see our section. cultivation and properties of cashews.
- Leaf or bark tea is used in some countries for traditional management of Hypertension, pain and inflammation.
Cashew Farming: A Comprehensive Guide
Optimal climate and conditions
- Tropical and subtropical climate: Cashews require a warm, frost-free climate, with average temperatures between 20ºC and 30ºC, tolerating highs of up to 38ºC and brief lows close to 0ºC.
- Precipitation: Between 600 and 2000 mm per year. It tolerates both dry seasons (from 4 to 7 months) and wet periods, although excessive rainfall can limit production.
- Humidity: It grows well even in low humidity (from 25% if the roots can access sufficient water). Humidity levels above 80% can promote fungal growth.
- Altitude: It is optimal between 0 and 400 meters above sea level, with acceptable yields up to 600 m. Above 1000 m, yields are drastically reduced.
Soil characteristics and preparation
- Loose, deep, well-drained soils: The best results are obtained in sandy or loamy soils, at least 90 cm deep, with a slightly acidic or neutral pH (5-7,5) and slopes of less than 5%. It does not tolerate waterlogged or compacted soils.
- Preparation: Before sowing, it is ideal to carry out deep work to oxygenate the soil and eliminate weeds and pathogens through crop rotation, solarization, or incorporation of organic fertilizers such as manure.
Planting and propagation techniques
- Direct sowing: It consists of placing three seeds in holes about 3 cm deep, and then selecting the most vigorous seedling. It allows for large areas but requires more care in the early years.
- Sowing by transplant: More recommended for facilitating early development in the nursery. Seedlings are transplanted at 1,5 to 2,5 months of age, coinciding with the start of the rainy season.
- Vegetative multiplication: Shield grafting is the most effective method for ensuring genetic quality, although most large-scale crops still rely on seed sowing.
Planting frames and density
Planting spacings vary between 6 x 8 m and 8 x 10 m, with densities of 125 to 270 trees per hectare. In intensive systems, a higher density can be started and reduced through successive thinning.
During the first two years, it is common to grow legumes or low-growing tubers as intercrops to control weeds and improve fertility.
Irrigation and fertilization
- Irrigation: It is not normally necessary except in particularly dry years or in soils with low water retention. In areas with rainfall below 1.000 mm per year, supplemental gravity irrigation during flowering and fruit set significantly improves yields.
- Fertilization: It is recommended to incorporate between 15 and 20 kg of manure per hole in the plantation, plus an annual contribution of mineral fertilizers of around 200 g of 10-10-10 formula per adult tree, adjusting the program based on local soil analysis.
Pests and diseases of cashews
- Fungal diseases: Anthracnose (Colletotrichum capsici), Fusarium spp., Aspergillus spp., Phytophthora palmivora, and Sclerotium rolfsii are among the most common pests. Prevention and constant monitoring are essential, applying specific fungicides only when necessary and maintaining the soil's biological balance.
- Pests: Whitefly (Aleurodicus cocois), binocular caterpillar (Anthistarcha binocularis), beetle Crimissa sp., thrips Selenothrips rubrocinctus, and nematodes of the genera Criconemoides and Scutellonema. Integrated management is key to minimizing losses and maintaining ecological viability.
Harvesting, yield and post-harvest
- Production The tree begins to bear fruit between the second and third year after planting and can maintain stable production for 25-30 years. With intensive management, yields can reach 3-4 tons/hectare of in-shell nuts and 24 tons of cashew apple per hectare annually.
- Collection and separation: The fruit reaches maturity when the apple detaches itself from the tree. The nut is manually separated from the pseudofruit, and both parts can have different commercial uses.
- Post-harvest and transportation: Cashews should be stored in cool environments (0-2°C) with a relative humidity of 85-90% to prevent rancidity and insect infestation. The product is very sensitive to freezing and is recommended for packaging in 4,5 kg bags for easy handling. The nuts must be carefully processed to avoid urushiol contamination.
Most important commercial cultivars and varieties
- The two main fruit variants are the red apple cashew and the yellow apple cashewThis last variety is usually less astringent and better suited for fresh consumption. To learn about the most recommended varieties, you can also consult our article on .
- Among the commercial varieties, the following stand out: Vengurla, Bhubaneshwar, Kanaka and Dhana Selection, originating from improvement programs in India and Brazil, specially adapted for intensive production and nut quality.
Comprehensive use of cashew nuts: culinary and industrial uses
Direct consumption of the seed
- Cashew nuts are mainly marketed roasted, salted or naturalThe raw seed should never be eaten as it contains urushiol, a potent skin irritant and toxicant. Therefore, even cashews labeled "raw" have previously undergone a brief heat treatment. For more information on the treatment process, check out our article on differences between nuts.
- In India, Vietnam, and other countries in the region, cashews are a key ingredient in curries, vegan dishes, pastries, and in the production of sauces and butters (cashew butter), which are increasingly popular around the world.
- Cashews can be added to salads, stews, rice dishes, breads, cookies, smoothies, or as a healthy snack.
The false fruit: cashew apple
- The "cashew apple" is rich in vitamin C and fiber. It is consumed fresh in its countries of origin, and in juices, wines, vinegars, jellies, and jams.
- For juice production, the "apples" are cooled to 0°C overnight, squeezed, and stabilized with natural preservatives before blending with other pectin-rich fruit products.
Industrial derivatives and other uses
- La cashew shell It is used to obtain phenolic oil, which is essential in the plastics, varnishes, resins and cosmetics industries.
- The bark and leaves are used in folk medicine, and their extracts are used in preparations for the treatment of skin infections and ailments.
- Cashew butter and vegan "cheese" made from this fruit have become key products in the vegan diet, for its creamy texture, mild flavor and nutritional profile.
Walnut classification and quality tables
- There are different commercial categories For cashews, based on size, color, and seed integrity. Grades W210 and W500, sized by the number of nuts per pound, are the most common.
- The optimal size for the market ranges from 26 to 28 mm, and the heavier seeds (over 10 grams) are preferred internationally.
Studies, scientific evidence and precautions
- Clinical studies have confirmed that regular consumption of cashews (around 30 grams daily, equivalent to 18-20 units) significantly reduces cardiovascular risk, improves the lipid profile, promotes satiety and supports metabolic and immune health.
- Nut allergies can cause anything from dermatitis to anaphylaxis. People with a history of allergies should avoid eating nuts or consult a specialist.
- Consumption of raw, untreated cashews is not recommended due to the presence of urushiol.
- Cashews contain small amounts of oxalates, which may be relevant for people with a tendency to develop kidney stones or pre-existing kidney problems.
Cashews in International Cuisine: Recipes and Ideas
- Cashews are used in Indian, Southeast Asian, and Latin American cuisine in curries, wok dishes, and sauces flavored with spices such as pepper, cardamom, ginger, and coconut.
- Cashew Butter: A sweet and creamy alternative, ideal for spreading, making sauces, or making healthy desserts. It's also the main base for homemade vegan cheeses.
- Salads and cookies: They provide crunch and a unique flavor to winter salads with apple, escarole, pumpkin, carrots, and other vegetables.
- Creative pastries: Cashew flour and the resulting cream are ideal for gluten-free baking or for enriching shakes, smoothies, vegetable croquettes, breads, and energy bars.
Frequently Asked Questions About Cashews
- How many cashews is recommended to eat per day? A serving of 20-30 grams (15-20 units) is adequate to enjoy its benefits without adding excess calories.
- Are cashews fattening? Its caloric content is high, but its satiating power and metabolic benefits allow it to be included in weight-control diets, always in reasonable quantities.
- Can diabetics take it? Yes, as part of a balanced diet, due to its low glycemic index and stabilizing effect on blood sugar.
- Are there contraindications? Only in cases of nut allergies, excessive consumption due to their caloric value, or kidney problems due to their oxalate content.
- Where to buy good cashews? It is recommended to choose fresh, vacuum-packed cashews of clear origin and, if possible, organically grown or without unnecessary additives.
From its exotic origin and complex harvesting to its extraordinary nutritional potential, the cashew nut is a jewel of nature, balancing the best of flavor and health. It's essential in modern and traditional diets, indispensable for vegans, athletes, and anyone committed to a healthy lifestyle. Incorporating cashews into your daily diet provides energy, nutritional balance, and endless possibilities in the kitchen and for overall health.