Pigeon Peas: Food, Medicine and More

(Nigeria Natural Medicine Development Agency)

Email: ngozikaokoye@yahoo.com

Pigeon pea, botanically known as Cajanus cajan (Fam. Fabaceae), also called red gram, gandules, or congo pea, is a tropical/subtropical perennial legume valued globally as both food and traditional medicine. It is hardy, drought-tolerant, and widely cultivated for its edible seeds and young pods, making it a staple in many diets.

Constituents

Pigeon peas contain macronutrients such as protein, carbohydrates, and dietary fibre; vitamins including folate, B-complex (thiamine, riboflavin, pyridoxine), and ascorbic acid; and minerals such as potassium, iron, magnesium, manganese, zinc, and phosphorus. They also contain phytochemicals including flavonoids, phenolic acids, tannins, and saponins with antioxidant potential.

Preparations

Pigeon peas are available as dried grain, fresh aerial portions, and green pods. The grain may be boiled and used to prepare soup. Cooking enhances digestibility and bioavailability of nutrients while reducing antinutrients inherent in raw legumes.

Pharmacological actions and medicinal uses

The antioxidant and anti-inflammatory properties of pigeon pea are due to the presence of anthocyanins and other antioxidants that protect cells from oxidative damage and down-regulate inflammatory cytokines. The presence of dietary fibre and complex carbohydrates confers blood glucose-regulating properties.

Pigeon peas have a low glycaemic index, meaning they release sugar slowly into the bloodstream, helping to maintain stable blood sugar levels. This makes them useful in the management of diabetes and metabolic syndrome. The fibre also supports gut health. Their low cholesterol and high potassium levels contribute to blood pressure regulation and heart health. Micronutrients such as vitamin C and iron bolster immunity and blood health. The dietary fibre aids digestion, promotes regular bowel movements, and helps prevent constipation. It also promotes feelings of fullness and satiety, thereby supporting weight management.

In traditional medicine, pigeon pea leaves or seeds are used for managing wounds, dysentery, colic, measles, smallpox, chickenpox, sickle cell anaemia, fever, hepatitis, malaria, and respiratory complaints. Emerging research suggests further potential in antimicrobial, anticancer, antidiabetic, and neuroprotective applications due to its diverse phytochemicals.

Adverse effects

Pigeon peas are generally safe as a dietary pulse. However, allergic reactions can occur in sensitive individuals, especially those with legume allergies. Antinutrient content (e.g., phytates) in raw seeds may interfere with mineral absorption if not properly cooked. Gastrointestinal discomfort such as gas and bloating may be experienced with large intakes in some people. Caution is advised for individuals with known legume intolerances.

Economic uses and potentials

Pigeon pea enhances food security in drought-prone regions because of its resilience and low input needs. The crop improves soil fertility via nitrogen fixation, reducing the need for synthetic fertilisers and benefiting sustainable agriculture. As a functional food ingredient, pigeon pea flour and products (bread, noodles, snacks) offer gluten-free, high-protein alternatives, expanding market opportunities.

Pigeon pea also has potential in the pharmaceutical, cosmetics, and food industries. Pigeon peas sell for ₦3,950 per paint bucket (approximately 600 g), or ₦19,000 per bag.

References

Firdous H. (2020). Health benefits of pigeon peas (Arhar Dal) and its side effects.