Yellow nut sedge

Yellow Nut Sedge (Cyperus esculentus L.): A Comprehensive Reference

1. Identity and Botanical Classification

1.1 Nomenclature

Yellow nut sedge (Cyperus esculentus L., also called chufa, tiger nut, atadwe, earth almond, and in Chishona, pfende) is a species of plant in the sedge family widespread across much of the world. The scientific name Cyperus esculentus derives from two roots: "Cyperus," coming from the Greek word for rush or sedge, and "esculentus," meaning edible, which hints at the plant's culinary uses. Additional vernacular names in English include nut grass, chufa sedge, and tiger nutsedge. The plant is also known as water grass in some regions.

C. esculentus is a tuber geophyte and most likely originates from the Mediterranean and Southwest Asia. It is a variable plant, and four wild-type varieties are presently recognized, in addition to a cultivated form. Some authorities recognize different sub-taxa of this species, but there is little agreement as to how many to recognize. POWO (Plants of the World Online) does not recognize any varieties and instead treats this as a single species native to Africa, Europe, North and South America, and Central through South Asia.

1.2 Botanical Description

Cyperus esculentus is a perennial growing to 0.9 m (3 ft) at a fast rate. It is a perennial grass-like plant producing solitary culms 10–90 cm tall from numerous spreading underground stolons. The apex of the stolons swells to form ellipsoid to globose tubers 10–18 mm long. Yellow nutsedge features slender, erect stems that can reach heights of 30 to 100 centimeters. The leaves are narrow, measuring 0.5 to 1.5 cm wide and can grow up to 40 cm long. The species is hermaphrodite (has both male and female organs) and is pollinated by wind.

C. esculentus is cultivated for its edible tubers, called earth almonds or tiger nuts (due to the stripes on their tubers and their hard shell), as a snack food and for the preparation of horchata de chufa, a sweet, milk-like beverage.

1.3 Global Distribution

Cyperus esculentus (yellow nutsedge) is found worldwide in warm and temperate zones. In the western hemisphere, it grows from southern Canada to northern Argentina. This plant is common throughout most of the United States and is native to North America. It is found in most of the Eastern Hemisphere, including Southern Europe, Africa and Madagascar, as well as the Middle East and the Indian subcontinent. Cyperus esculentus is cultivated in Egypt, Spain, Nigeria, the United States, Guatemala, Mexico, Chile, Brazil, Lebanon, Syria, Jordan, Saudi Arabia, Oman, Iran, Iraq, Pakistan, India, Yemen, Morocco, Ivory Coast, Sudan, South Sudan, Gambia, Guinea Bissau, Ghana, Niger, Burkina Faso, Togo, Benin, Cameroon, and Mali.

1.4 Common Forms and Preparations

The tubers are consumed as a snack food and for the preparation of horchata de chufa, a sweet, milk-like beverage. The plant is cultivated around the world on a small scale, especially popular in West Africa, where it is still consumed as a sweetmeat and side dish, with the "nuts" being eaten raw or roasted. Tiger nut can also be eaten raw, processed into flour and used for different purposes such as bread, and as a substitute in animal feed manufacture. Oil can also be obtained from tiger nut, which is highly unsaturated and good for the health of humans. As a dietary supplement or functional food ingredient, yellow nut sedge is commercially available in the following forms: whole dried or fresh tubers; tiger nut flour (produced by grinding dried tubers); tiger nut milk or horchata (an aqueous extract of the tuber); cold-pressed or solvent-extracted tiger nut oil; and dry extracts of the tuber or rhizome for encapsulation.

2. Traditional and Historical Use

2.1 Ancient Egypt

Originating in Northeast Africa and the Mediterranean, archaeological evidence suggests the earliest use and consumption of tiger nuts occurred in Egypt as early as 4000 B.C., where they were eaten roasted, ground into flour, or made into sweets. There is evidence of the plant having been important in Egyptian culture for far longer, as the tomb of the Egyptian nobleman Rekhmire (c. 15th century BC) has a mural of the plant, and dry tubers appear in tombs as early as the Predynastic Period (around 3000 BC).

2.2 Ancient Egypt, China, and India: Medicinal Applications

In ancient Egypt, China, and India, tiger nut tubers were also consumed as a liver tonic for healing of stomach pain, mouth and gum ulcers, and as an aphrodisiac for improvement of the human reproductive system. The plant has been cultivated since ancient times for its nutritious and versatile tubers, which are used in cooking, traditional medicine, and various industries.

2.3 West Africa

C. esculentus is widely cultivated and used for food purposes in European countries and in African countries such as Nigeria, Niger, Mali, Senegal, Ghana, and Togo. In West Africa, tiger nut tubers (known locally as atadwe in Ghana and aya in Nigeria and Niger) have been consumed for centuries as a staple snack and as a basis for sweetened beverages. The popular Spanish drink horchata de chufa, also known as orxata de xufa in Valencian or kunna aya in various West African countries, is made of yellow nutsedge root.

2.4 Spain and the Mediterranean (Horchata de Chufa)

Known for producing edible tubers called "earth almonds," the plant has been cultivated since ancient times and remains popular in parts of Europe and Africa, particularly for the beverage horchata de chufa. Tiger nut is a tuber mainly used to obtain a tiger nut beverage with a milky appearance, called "horchata." It is typically from Spain, where the horchata production industry supposes €60 million per year. The by-products generated from this industry are up to 60% of the tiger nut used, which equals 1.8 million kg per year.

2.5 Ethnomedicinal Uses Across Cultures

Several ethnobotanical surveys have reported the use of C. esculentus for the treatment of health problems such as diabetes, tuberculosis, urolithiasis, malaria, stomachache, eye ache, sexual weakness, muscle diseases, and wounds by traditional communities in India, Brazil, Iraq, Benin, Kenya, Mali, Togo, Morocco, and Nepal. It was reported that consumption of tiger nut is beneficial to patients with diabetes, cardiovascular disease, and obesity, as it can help boost blood circulation, lessen cardiovascular diseases and thrombosis, prevent stroke and inflammation of the respiratory passages, and reduce the risk of colon cancer. These uses, while widespread across multiple traditional medicinal systems, should be distinguished from scientifically validated therapeutic claims; the ethnomedicinal record documents what communities have believed and practised, not what has been proven in controlled clinical trials.

3. Key Constituents and Active Compounds

3.1 Macronutrient Profile

In terms of energy, tiger nut tubers provide 400–414 kcal/100 g. They contain high amounts of carbohydrates (≈47%), especially starch (14–37%), fats (20–38%), and a low protein content (6.10–9.70%), as well as dietary fiber (8–9%).

Although tuberous vegetables are not typically acknowledged for their protein levels, four protein fractions have been identified, with glutelin being the most abundant (47.50%), followed by albumin (31.80%), globulin (4.70%), and prolamine (3.80%). The amino acid profile reveals valine having the highest concentration (67.59 µg/100 g), followed by leucine, phenylalanine, lysine, histidine, and tryptophan in smaller amounts.

3.2 Fatty Acid Profile

Cyperus esculentus L. is a rich source of both saturated and unsaturated fatty acids, containing high levels of oleic acid (56–85%), along with smaller amounts of palmitic (10–20%), linoleic (8–12%), and stearic acid (0.30–5.30%). Few works were focused on the possibility of using tiger nut oil, a nutritious oil comparable to olive oil, as an edible oil. Oleic acid (C18:1cis n-9) was identified as the predominant fatty acid across all samples, thus contributing positively to favorable health lipid indices (P/S > 0.50, low atherogenicity and thrombogenicity indices, high hypocholesterolemic/hypercholesterolemic ratio).

3.3 Starch

Tiger nut can be a major source of edible oil production because of the 19.79–37.83% fat accumulated in its tuber, and it also constitutes up to 14–37% of starch on a dry basis. Since it is globally popular and widely cultivated in Africa, Asia, Europe, and America, tiger nut is a promising and underutilized source of commercially available starch.

3.4 Dietary Fiber

The presence of dietary fibers plays a significant role in alleviating digestive problems and obesity. Tiger nut fiber is primarily insoluble and has been studied as a functional food ingredient and prebiotic substrate, as discussed in Section 5.

3.5 Minerals and Vitamins

Tiger nut is a good source of starch, fat, protein, minerals (such as sodium, magnesium, manganese, iron, potassium and calcium), unsaturated fatty acids (mostly oleic acid), dietary fibers and vitamins (C and E). Potassium was the most abundant macroelement in natural and peeled tiger nut tubers. The overall trend of microelement levels in these samples was: Al > Fe > Zn > Cu > Sr > Mn > Li > Ba > Se > As > Cr.

3.6 Polyphenols and Phenolic Acids

Tiger nut tubers possess a substantial concentration of polyphenolic compounds, alkaloids, steroids, terpenoids, flavones, saponins, tannins, and other phytoprotective compounds that provide a broad spectrum of health advantages. By liquid chromatography-mass spectrometry, 30 compounds including flavan-3-ols, caffeic acid derivatives, and flavones were identified from the leaves. The quantitative analysis revealed that gallocatechin, procyanidin B1, catechin, chlorogenic acid, orientin, and luteolin 7-O-glucuronide are the major chemical constituents of C. esculentus leaves.

Some polyphenols were identified and quantified in tiger nut by-products: p-coumaric (7.67 ± 0.16 mg 100 g⁻¹ dry matter), ferulic (4.07 ± 0.01), sinapinic (0.50 ± 0.01), and cinnamic acids (1.10 ± 0.03), 4-hydroxybenzaldehyde (1.28 ± 0.06), luteolin (1.03 ± 0.01), and naringenin (0.60 ± 0.01).

The horchata beverage contains vitamin C, biotin, and vitamin E, as well as a range of polyphenols, such as gallic acid, 3,4-dihydroxybenzoic acid, catechin, rutin, and coumaric acid, which have been detected in relatively high concentrations (1–40 mg/L), as well as a variety of conjugated polyphenols and other unidentified compounds.

3.7 Volatile Compounds (Essential Oil Constituents)

From the essential oil of C. esculentus root, cyperene and cyperotundone are significant constituents that have shown more than 50% pest-repellent effects over an exposure period of 1 to 8 hours. These sesquiterpenoid constituents are shared with related species in the Cyperus genus.

3.8 Bioactive Secondary Metabolites

In addition to the primary macronutrients, tiger nut contains various bioactive compounds such as alkaloids, tannins, phytates, phytosterols, glycosides, saponins, and flavonoids, which are essential to human health. Phytochemicals like flavonoids, alkaloids, fat, fatty acids, and others that are abundant throughout the plant aid in a number of metabolic processes as well as elicit therapeutic and biological effects of anti-oxidation, anti-inflammation, anti-cardiovascular disease, aphrodisiac, and anti-diabetic effects, thus improving general wellbeing and health conditions.

4. Scientific Evidence by Area of Use

Note: The following sections systematically distinguish between in vitro (cell-based), in vivo (animal), and human/clinical evidence. Where clinical evidence is absent or very limited, this is stated explicitly. Most of the available research is preliminary.

4.1 Digestive Health and Prebiotic Effects

The potential health benefits of tiger nut are thoroughly reviewed in the literature, including its effects on digestive health, cardiovascular health, blood sugar control, immune function, and other potential therapeutic uses.

One of the better-studied human applications concerns tiger nut's effect on gut microbiota. A study evaluated the effects of an unprocessed horchata drink on the gut microbiota of healthy adult volunteers (n = 31) who consumed 300 mL of natural, unprocessed horchata with no added sugar daily for 3 days. Although there were no apparent overall microbial profile changes, differences could be determined when volunteers were segmented by microbial clusters. Three distinctive enterotypes were identified prior to consuming horchata; after consuming horchata, samples of all volunteers were grouped into two clusters, one enriched in Akkermansia, Christenellaceae, and Clostridiales, and the other with a remarkable presence of Faecalibacterium, Bifidobacterium, and Lachnospira.

This is a small, short-duration trial (3 days, 31 subjects) and cannot establish long-term prebiotic effects. The observed changes in microbiota composition are promising but preliminary. The dietary fiber content of tiger nut tubers — reported at 8–9% by weight — is believed to be the primary driver of these effects, though the specific fermentable fractions have not yet been definitively characterized in controlled human trials.

4.2 Cardiovascular Health and Lipid Profile

Oleic acid was identified as the predominant fatty acid across all samples, thus contributing positively to favorable health lipid indices including a P/S ratio > 0.50, low atherogenicity index and thrombogenicity index, and a high hypocholesterolemic/hypercholesterolemic ratio. These in vitro and compositional findings suggest a potentially favorable lipid profile, analogous to olive oil.

A small human study investigated the effects of tiger nut on hypercholesterolemic subjects. This consisted of 26 persons screened and confirmed with biochemical analysis to have high levels of cholesterol (450–520 mg/dL) present in their bloodstream, in the age range of 40–56 years and body weight of 75–82 kg. The high content of oleic acid in tiger nut was proposed to have a positive effect on cholesterol, thereby potentially preventing heart attacks, thrombosis, and activating blood content of soluble glucose. This study was conducted in Nigeria and its methodology, including full controls, randomization, and blinding status, is not reported in detail in available sources. The evidence for cholesterol-lowering effects in humans remains weak and requires confirmation in rigorously controlled randomized trials.

It was reported that consumption of tiger nut is beneficial to patients with cardiovascular disease and obesity, as it can help boost blood circulation, lessen cardiovascular diseases and thrombosis, and prevent stroke and inflammation of the respiratory passages. These statements are drawn from review literature and largely reflect the theoretical implications of the fatty acid profile rather than established clinical trial outcomes.

4.3 Glycemic Regulation and Antidiabetic Properties

In vitro and animal studies suggest that C. esculentus extracts may modulate carbohydrate-metabolizing enzymes. The kinetics of the modulatory role of Cyperus esculentus L. on the specific activity of key carbohydrate metabolizing enzymes was studied, published in the African Journal of Traditional, Complementary, and Alternative Medicines (2017;14(4):46–53). These findings relate to alpha-amylase and alpha-glucosidase inhibitory activity, which are mechanistically linked to reduced postprandial glycemic rises.

Ethnobotanical surveys have reported the use of C. esculentus for the treatment of health problems such as diabetes by traditional communities across multiple countries including India, Brazil, Iraq, Benin, Kenya, Mali, Togo, Morocco, and Nepal. No large-scale randomized controlled clinical trials in humans have been identified in the peer-reviewed literature establishing a proven antidiabetic effect for yellow nut sedge. The available evidence is preclinical (in vitro enzyme inhibition and rodent studies) and requires human clinical validation.

4.4 Antioxidant Activity

The antioxidant activity of Cyperus esculentus has been widely reported. Cyperus esculentus presents phytochemicals of food and pharmaceutical interest. The leaf extract showed strong antioxidant activity in vitro, with gallocatechin, procyanidin B1, and chlorogenic acid contributing the most. The extract showed significant protection against the agricultural fungicide tebuconazole-induced developmental toxicity and hepatotoxicity in zebrafish.

Natural tiger nut tubers exhibited substantially higher antioxidant activity and total phenolic content compared to peeled tubers, suggesting that the peel is the primary reservoir of phenolic compounds. Strong antioxidant activity was also observed in tiger nut oil (64.82 ± 2.59 mg TEAC/L). Antioxidant findings are predominantly from cell-free assays (DPPH, ABTS, FRAP) and zebrafish models. No controlled human intervention trials specifically measuring in vivo antioxidant biomarkers in response to yellow nut sedge supplementation have been identified in the peer-reviewed literature.

4.5 Macular and Eye Health

Clinical studies have associated the consumption of tiger nuts and their derivatives with improved macular health, due to the presence of certain liposoluble compounds with antioxidant activity, especially lutein and zeaxanthin. However, the benefits derived from ingestion of tiger nut products may vary depending on the release of these compounds from the food matrix to the digestive fluids and their eventual bioabsorption. Research has therefore aimed at evaluating the influence of the food matrix on the liberation and final bioaccessibility of bioactive compounds with positive impact on macular health in different tiger nut products (flour, oil, and milk with and without added sucrose). This area of evidence is still at a preliminary stage with respect to definitive clinical outcomes.

4.6 Reproductive and Aphrodisiac Properties

In ancient Egypt, China, and India, tiger nut tubers were consumed as an aphrodisiac for improvement of the human reproductive system. In an animal study, the group given Cyperus esculentus extract for over a month showed increased sperm count and a regenerative effect on testicular histology. In some parts of Africa, tiger nuts have been used as a medication for erectile dysfunction, increasing libido, and boosting sperm count.

An aqueous extract of Cyperus esculentus L. was studied for its ability to restore and boost sexual competence in paroxetine-dysfunctioned male Wistar rats, published in the Journal of Experimental & Integrative Medicine (2016;6:12–20). These findings are from animal models only. No controlled human trials have been identified that establish aphrodisiac or pro-fertility efficacy in humans.

4.7 Antimicrobial Activity

Research aimed to evaluate the phytochemical, proximate, GC-MS, and pharmacological properties such as antioxidant, anticancer, anti-elastase, anti-melanogenic, and anti-tyrosinase activity in ethanol and n-hexane extracts of tiger nut. The pharmacological activities were measured using spectrophotometry, agar well diffusion, MCF-7 and HeLa cell methods. The tiger nut extracts showed the existence of bioactive compounds such as alkaloids, glycosides, flavonoids, crude fibres, tannins, proteins, carbohydrates, oxalates, phytates, and fats. The ethanol extract showed superior pharmacological (anticancer, antibacterial, anti-melanogenic, and antioxidant) activities, especially against the MCF-7 cell line. These findings are derived from in vitro cell culture assays; no human clinical data on antimicrobial applications have been identified.

4.8 Overall Strength of Evidence

This plant's documented digestive, cardiovascular, metabolic, and microbiota-modulating benefits are noted, while most findings are preliminary or population-specific. The evidence base remains limited, with most studies being short-term, small-scale, or geographically restricted. Future research should prioritize long-term clinical trials, dose-response studies, and evaluations across diverse populations to establish robust dietary recommendations.

5. Body Systems and Health Areas

• Digestive system: The presence of dietary fibers plays a significant role in alleviating digestive problems and obesity. Prebiotic modulation of gut microbiota has been explored in a small human trial (see Section 4.1).
• Cardiovascular system: The predominance of oleic acid contributes positively to favorable lipid health indices including low atherogenicity and thrombogenicity indices.
• Metabolic/endocrine system: Preclinical evidence suggests modulation of carbohydrate-metabolizing enzymes relevant to blood glucose regulation.
• Immune system and oxidative defense: The leaf extract showed strong antioxidant activity in vitro.
• Reproductive system: Animal studies and ethnomedicinal traditions link the plant to improvements in sperm count and sexual function.
• Visual system (macular health): Clinical studies have associated the consumption of tiger nuts with improved macular health, due to the presence of liposoluble compounds with antioxidant activity, especially lutein and zeaxanthin.
• Musculoskeletal and nervous system: Tiger nut contains a good quality of vitamin B1, which assists in balancing the central nervous system and helps to encourage the body to adapt to stress.

6. Dosage Forms and Reported Dosages

There is no established standardized supplemental dose for yellow nut sedge. Dosages reported in the available scientific literature are as follows:

• Horchata (tiger nut milk), microbiota study: 31 healthy adult volunteers consumed 300 mL of natural, unprocessed horchata with no added sugar daily for 3 days.
• Tuber extract, cognitive/mood observational study: Four adults took 3 grams of a 30% ethanol extract of Cyperus esculentus tuberous rhizome, one to two times daily for a week, or in combination with 400 mg of a mango leaf extract taken once daily for a week; the combination was then taken once to twice daily for two weeks.
• Tuber extract, combined observational study (9 subjects): In a 2-week observational study, 9 adults ingested a combination of 3 grams of the Cyperus esculentus tuberous rhizome extract and 400 mg mango leaf extract daily over a two-week period.
• Whole tubers or flour, food use: In food-based studies, tiger nut flour has been incorporated into composite food matrices as a functional ingredient; the tuber is described as a high-quality wholesome crop that contains lipids, protein, starch, fiber, vitamins, minerals, and bioactive factors.

No official pharmacopeial or regulatory body has established a recommended or maximum dose for yellow nut sedge as a dietary supplement. The dosages noted above are small-scale observational reports and should not be construed as established clinical recommendations.

7. Safety Considerations

7.1 General Safety Profile

All target hazard quotient (THQ) and total THQ values for tiger nut tubers were below 1, indicating no appreciable health risk associated with consumption. In a small observational study, no side effects were experienced by participants taking a 30% ethanol extract of C. esculentus tuberous rhizome; all subjects noted distinctly improved mood and well-being, and increased alertness, focus, and concentration.

7.2 Antinutritional Factors

The tiger nut extracts in phytochemical and proximate analysis showed the existence of antinutritional compounds including oxalates and phytates. Analysis of the antinutrient composition of raw tiger nut tubers has yielded oxalates (0.25 ± 0.65 g/100 g), phytate (1.97 ± 0.81 mg/100 g), saponins (0.88 ± 0.02/100 g), tannins (9.50 ± 0.46 mg/100 g), and cyanogenic glycosides (1.80 ± 0.69 mg/100 g). These antinutrients may reduce mineral bioavailability when tiger nuts are consumed in large quantities as raw whole tubers.

Roasting numerically decreased the levels of the anti-nutritive factors analyzed. The concentration of alkaloids, phytate, tannin, hydrogen cyanide, oxalate, and saponin also reduces after fermentation. Soaking could be considered the best processing method for tiger nut, since it reduces antinutrient content and still retains the nutrient value of the nut.

7.3 Aflatoxin and Mycotoxin Contamination

Tiger nut tubers are susceptible to fungal contamination during storage. A 2018 paper specifically reviewed prevention strategies against contamination of Cyperus esculentus and tiger nut-derived products as matters of economic importance. This is a documented food safety concern particularly relevant to improperly stored bulk tubers, and is separate from concerns about the plant's intrinsic constituents. Properly stored, dried, or processed tiger nut products present a substantially lower contamination risk.

7.4 Composition Variability

The nutritional composition of tiger nuts depends on several factors, including variety, soil and environmental conditions, cultivation methods, and notably, storage practices. The composition of horchata changes with the geographical origin of the tiger nut tubers and also depends on the processing conditions, as some components of horchata are sensitive to thermic treatment.

7.5 Drug Interactions

No formal pharmacokinetic drug interaction studies for yellow nut sedge have been identified in the peer-reviewed literature. The high fiber content of tiger nut preparations could theoretically affect the rate of absorption of co-administered oral medications, as is common with other high-fiber supplements; however, this has not been studied specifically for Cyperus esculentus. The available evidence base contains no documented clinically significant herb-drug interactions.

7.6 Allergenicity

Despite the common name "tiger nut," Cyperus esculentus is not a true nut and is not related to tree nuts or peanuts; it is the tuber of a sedge plant. It has historically been promoted as an allergen-friendly snack suitable for people with tree nut allergies. However, no formal, large-scale allergy surveillance studies specific to yellow nut sedge have been identified in the peer-reviewed literature. Individuals with confirmed hypersensitivity to members of the Cyperaceae family should exercise caution.

References

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