Mung bean

Mung Bean (Vigna radiata)

1. Identity and Botanical Description

Nomenclature and Taxonomy

Mung bean (Vigna radiata) is a plant species of the family Fabaceae, also commonly known as green gram. It used to be known as Phaseolus aureus Roxb. before many Phaseolus species were moved to the Vigna genus. Its currently accepted scientific name is Vigna radiata (L.) R. Wilczek, with historic synonyms including Phaseolus radiatus L. and Phaseolus aureus Roxb. It is sometimes confused with black gram (Vigna mungo) due to their similar morphology, though they are two distinct species.

There are three subgroups of Vigna radiata: one cultivated (Vigna radiata subsp. radiata) and two wild ones (Vigna radiata subsp. sublobata and Vigna radiata subsp. glabra).

Morphology

The mung bean is an annual, semi-erect to erect or sometimes twining deep-rooted herb, 25–100 cm tall, with stems that branch at the base and are covered with short fine brownish hairs. Leaves are alternate and trifoliate, or sometimes with five leaflets. The crop begins flowering 50 to 60 days after sowing and continues for a few weeks; 10 to 25 flowers are borne in axillary clusters or racemes, and the flowers are greenish to bright yellow, 1 to 1.75 cm in diameter.

Common Names and Common Forms

The plant is known by a variety of vernacular names across different regions: mung bean, green gram (South Asia), moong dal (India), and Lu Dou (Chinese: 绿豆). Mung beans are widely consumed as a nutritional food in the forms of cooked whole beans, flour, or sprouts. Additional preparations include split and dehulled seeds (moong dal), germinated sprouts, fermented preparations, starch-based noodles (glass noodles or mung bean thread), protein isolates, and sweet soups. The starch isolated from mung beans is used as an ingredient for mung bean thread noodles.

2. Traditional and Historical Use

India and Ayurvedic Medicine

Domestication of mung bean took place more than 4,000 years ago in India, from which it was transferred to other Southern and Northern Asian regions. Mung bean is an important pulse consumed all over the world, especially in Asian countries, and has a long history of usage as traditional medicine. In Ayurveda, the seeds — particularly when split into dal — are among the most frequently cited legume medicines. Mung beans are valued in Ayurveda since they are easy to digest, high in bioavailable protein, and useful for weight management and anti-aging. Preparations include simple boiled dal (soup), the mixed rice-and-lentil dish kitchari used in cleansing protocols, ground fermented pastes fried as dosas, and steamed dumplings. They are most often cooked into a soup (or dal) in India; or they may be ground with rice to a thick paste, fermented, then fried into a thin pancake known as a dosa; the fermented paste may also be used to make idly, a dumpling served with yogurt sauces.

Traditional Chinese Medicine

In China, mung beans have been utilized for more than 2,000 years in traditional Chinese medicine (TCM). The Compendium of Materia Medica (the "Bencao Gangmu"), a well-known Chinese pharmacopoeia, has recorded that mung bean can be utilized as a Chinese traditional medicine for its detoxification activities, recuperation of mentality, ability to alleviate heat stroke, and regulation of gastrointestinal upset. In TCM, mung bean (Lu Dou) is classified as having a cold/cooling thermal nature with a sweet flavor. According to TCM classification, mung bean clears heat, detoxifies, reduces swelling, promotes urination, quenches thirst, and aids edema in the lower limbs; it is recommended for conjunctivitis, diabetes, dysentery, summer heat, heatstroke, and dehydration. Mung bean has been used as a medicinal herb for dissipating fever and detoxifying the body since the 1050s.

In TCM, mung beans (Lu Dou) were used to clear heat toxins and as a mild laxative. External TCM preparations included topical pastes applied to toxic sores and swellings, and powders combined with other herbs for carbuncles and skin eruptions. A paste is applied externally for breast distention and mastitis; sleeping on a pillow of mung beans was described in TCM texts as benefiting the eyes and clearing wind from the head, including headaches and tinnitus. A standard TCM decoction dosage is cited as 15–30 grams of whole bean.

Southeast Asia and Other Regions

Mung beans were introduced to Africa and the Middle East, where they quickly established themselves as a staple of regional cuisine. In Indonesia, mung beans are featured in sweet dishes cooked with coconut milk, sugar or jaggery, and ginger. In Chinese medicine, bean sprouts are considered a yin or cooling food, often recommended by Oriental herbalists for all hot, inflammatory conditions, ranging from systemic infections to heat stroke to hypertension.

3. Nutritional Composition

Mung bean has been known to be an excellent source of protein, dietary fiber, minerals, vitamins, and significant amounts of bioactive compounds, including polyphenols, polysaccharides, and peptides, making it a popular functional food. It provides significant amounts of protein (240 g/kg) and carbohydrate (630 g/kg) and a range of micronutrients. It is a highly nutritious grain legume with a high content of easily digestible proteins (20–32%), carbohydrates (53.3–67.1%), and lipids (0.71–1.85%), as well as vitamins, minerals, and fiber.

Mung bean protein and carbohydrate are easily digestible and create less flatulence than proteins derived from other legumes. In addition, mung bean is lower in phytic acid (72% of total phosphorus content) than pigeonpea, soybean, and cereals; phytic acid has a negative impact on iron and zinc bioavailability in plant-based diets.

Mung bean protein is well digestible, and provides sufficient amounts of most essential amino acids but only limited amounts of sulfur-containing amino acids, for which reason its protein digestibility-corrected amino acid score (PDCAAS) is lower than that for some other legume proteins. The resulting PDCAAS values were calculated to be 0.638 and 0.635 for uncooked mung bean protein and 0.580–0.598 for cooked mung bean protein, using the WHO/FAO/UNU 2007 reference scoring pattern.

4. Key Bioactive Constituents and Mechanisms of Action

Polyphenols: Vitexin and Isovitexin

Vitexin and isovitexin are identified as the major polyphenols in mung bean, and peptides containing hydrophobic amino acid residues with small molecular weight show higher bioactivity. Vitexin and isovitexin have been reported to be the most abundant flavones present, at concentrations of 51.1 and 1.7 mg/g, respectively. From the seed coat, vitexin and iso-vitexin were identified as the two major phenolic compounds at 15.28 mg/g and 23.74 mg/g, respectively.

This high antioxidant activity is due to the presence of two major antioxidant compounds, vitexin and isovitexin, among which vitexin alone is capable of inhibiting DPPH radicals by approximately 60% at a concentration of 100 µg/ml. Recent studies have shown that mung bean extract and/or components such as vitexin and isovitexin can alleviate pathogenic heat and oxidative stresses.

Acetone extracts from sprouts show higher activity than extracts from seeds, because of the occurrence of a higher amount of total phenols and flavonoids (4.5 and 6.8 times more, respectively) than raw seeds. HPLC-MS/MS analysis of germinated mung bean polyphenols identified main compounds including quinic acid, quercetin, rutin, vitexin, and isovitexin.

Proteins: 8S Globulin and Bioactive Peptides

The main component of mung bean protein, accounting for over 80% of the protein, is 8S globulin, which has exhibited the highest degree of sequence identity (68%) and structural similarity with soybean β-conglycinin. 8S globulin was found to contain bioactive peptides that block angiotensin II-converting enzyme (ACE) activity in vitro and was therefore hypothesized to alleviate hypertension.

Polysaccharides

The mung bean or its active compounds prevented an increase in serum glucose and lipid concentrations by inhibiting the activities of related enzymes in carbohydrate and lipid metabolism, increasing lipolysis in the liver and adipose tissue, and decreasing oxidative stress in white adipose tissue, also increasing capacity for energy metabolism in the gastrocnemius muscle.

Other Phytochemicals

Different compounds have been isolated from mung bean belonging to different classes such as flavones, isoflavones, flavonoids, and isoflavonoids. Mung bean seeds and sprouts contain different components such as organic acids (citric acid, phosphoric acid), phenolic acids, lipids (γ-tocopherol), and flavonoids that have been recognized as contributing to pharmaceutical properties. The protease inhibitor mungoin has been shown to be responsible for some of the antifungal and antibacterial activities of mung beans.

Effect of Processing on Bioactive Compounds

The sprouting of seeds leads to dynamic changes in metabolites, with a decrease in antinutrient content and an increase in nutritional value. Fermentation and germination processes are well recognized to enhance the nutritional values, especially the concentration of active compounds such as amino acids and GABA. Germinated and fermented mung bean have recorded an increase of 27.9 and 7.3 times of GABA and 8.7 and 13.2 times of amino acid improvement, respectively, compared to normal mung bean.

5. Scientific Evidence by Area of Use

5.1 Glycemic Control and Antidiabetic Effects

Results obtained from in vitro and animal studies indicated that mung bean and its extracts possess the ability to modulate glucose metabolism effectively. Aqueous and ethanolic extracts showed a consequential inhibitory effect on the starch-hydrolyzing enzymes, such as gastrointestinal α-amylase (pancreatic) and α-glucosidase (intestinal). This may contribute toward reducing the intestinal absorption of carbohydrates, enhancing insulin sensitivity, and thus reducing body hyperglycemia. From current research, vitexin and isovitexin in mung bean may be the main active components to play a remarkable role in regulating glucose metabolism.

A commercially available singular constituent, either purified vitexin or iso-vitexin, has been associated with a decreased risk of T2DM. In one study, vitexin and iso-vitexin were extracted from mung bean seed coat and purified; eleven mixture ratios were determined for their antihyperglycemic activities. A 1:1.5 ratio of vitexin to iso-vitexin demonstrated the most synergistic effects for enzyme inhibition and glucose uptake in HepG2 cells within an insulin-resistant system. This represents in vitro evidence only.

Human clinical evidence: Two independent double-blind, placebo-controlled clinical studies were conducted on a commercially available mung bean protein isolate (GLUCODIA™). In the first study, mung bean protein was shown to exert physiological beneficial effects when 3.0 g were ingested per day. In the second (main) clinical trial, mung bean protein isolate did not lower plasma glucose levels, although the mean insulin level decreased with consumption of mung bean protein. The HOMA-IR values (insulin resistance index) significantly decreased with mung bean protein. The mean triacylglycerol (TAG) level significantly decreased, a significant increase in serum adiponectin levels was observed, and improvement in liver function enzymes was noted. These findings suggest that GLUCODIA™ could be useful in the prevention of insulin resistance and visceral fat accumulation, and in the prevention of liver function decline. These results were mixed: blood glucose itself was not reduced in the main trial. The studies were industry-sponsored, relatively small, and short-term, limiting the strength of conclusions.

Animal/preclinical evidence: In a mouse model, diabetes was induced by alloxan injection (150 mg/kg), and methanol extract of V. radiata seeds (100, 200, and 400 mg/kg) was given orally for 14 days alongside the reference drug glibenclamide. Blood glucose levels and body weight were measured at 7 and 14 days. Overall, the body of animal data is more consistent than the human data, but animal studies cannot be directly extrapolated to clinical practice.

5.2 Cardiovascular Effects: Lipid-Lowering and Antihypertensive Activity

The mung bean has been documented to ameliorate hyperglycemia, hyperlipemia, and hypertension. Supplementation of 1 or 2% mung bean could decrease plasma total cholesterol and triacylglycerol levels in animal models. A proposed mechanism involves upregulation of cholesterol-7α-hydroxylase (CYP7A1), which increases bile acid synthesis from cholesterol.

Human clinical evidence: Mung beans have shown promise in enhancing cardiovascular function, lowering blood pressure, and improving lipid profiles, though the underlying mechanisms remain unclear. A three-arm randomized, double-blind, placebo-controlled trial involved male and female participants aged 45 to 60 who consumed either a placebo or a mung bean functional drink containing 10 or 15 g of mung bean protein daily for six weeks. Vasodilation was assessed using flow-mediated dilation (FMD), and oxidative stress markers, antioxidant enzyme activity, and inflammatory markers were measured at baseline and after the intervention. The results indicate that six weeks of mung bean consumption significantly benefits healthy middle-aged adults by enhancing antioxidant enzyme activity and reducing inflammatory mediators' expression.

The ACE-inhibitory action of mung bean bioactive peptides can help regulate blood pressure and improve endothelial function. This dual action, combining ACE inhibition and antioxidant effects, promotes cardiovascular health by improving endothelial function and reducing the risk of chronic diseases. These findings are preliminary and require replication in larger, longer-duration trials with standardized mung bean preparations.

5.3 Antioxidant Activity

Vitexin and isovitexin, as major antioxidant components in various cultivars of mung bean, may be involved in DPPH and ABTS•+ radical scavenging abilities, and ferric reducing antioxidant power (FRAP). The methanolic extracts of mung bean exhibit high free radical scavenging and reducing power activity because of the presence of a high level of polyphenols. Evidence for antioxidant activity in humans is largely indirect, derived from biomarker studies embedded within the clinical trials described in other sections.

5.4 Hepatoprotective Effects

Consumption of mung bean in different forms such as sprouted, cooked, or fermented beans has been shown to exhibit significant hepatoprotective activity in a dose-dependent manner by decreasing enzyme activities (aspartate aminotransferase and alanine aminotransferase) and preventing excess deposition of fat. This evidence is from animal and cell-based studies. In one preclinical study, antioxidant and hepatoprotective effects of freeze-dried mung bean and amino-acid- and GABA-enriched germinated and fermented mung bean aqueous extracts were compared in an ethanol-induced liver damage model. These results suggested that freeze-dried, germinated, and fermented mung bean aqueous extracts enriched with amino acids and GABA possessed better hepatoprotective effect compared to normal mung bean. No rigorous human clinical trials specifically targeting hepatoprotection from mung bean have been identified in the literature.

5.5 Anticancer Properties

Mung bean has been reported to have anti-inflammatory, antioxidant, antiproliferative, and immunomodulatory properties, which may possess preventive potential against carcinogenesis. By performing SRB assay, methanolic extracts of seed coat obtained from sprouted seeds were shown to exhibit anticancer activity against the human lung cancer cell line HOP-62; the extract at 80 µg/ml concentration showed 65% cell growth inhibition activity. In one study of 66 plants and vegetables commonly consumed in Japan, boiled extracts of beans including mung beans were among the food groups found to have the greatest anti-tumor-promotion and radical-scavenging activities. All current anticancer evidence for mung bean is from cell line and animal studies; no human clinical trials demonstrating cancer preventive or therapeutic efficacy have been published. This area remains preliminary.

5.6 Antimicrobial Activity

The plant contains various phytochemicals such as alkaloids, flavonoids, saponins, phenols, glycosides, and bioactive peptides, which exhibit pharmaceutically important properties including anti-inflammatory, antinociceptive, and antimicrobial effects. Antimicrobial evidence is limited to in vitro studies, and no clinical human evidence has been established. The protease inhibitor mungoin has been shown to be responsible for some antifungal and antibacterial activities.

5.7 Anti-inflammatory Effects

Mung beans exhibit COX-2 inhibitory properties, which can reduce inflammation. By inhibiting COX-2, mung bean may lower the production of pro-inflammatory mediators, contributing to observed decreases in IL-6 levels. Mung bean also demonstrates an ability to suppress TNF-α levels and inhibit the NF-κB signaling pathway, both of which are critical in mediating inflammatory responses. The downregulation of TNF-α in conjunction with NF-κB inhibition underscores the potential of mung beans to alleviate systemic inflammation. These mechanisms have been demonstrated in cell-based and some animal experiments; human-specific evidence for anti-inflammatory endpoints is limited and embedded in the cardiovascular trials above.

5.8 Systematic Review Evidence

A systematic review highlighting bioactive compounds in mung beans and their hepatoprotective, hypolipidemic, antidiabetic, antioxidant, anticancer, anti-anemic, antistress, anti-obesity, and anti-Alzheimer's effects conducted a comprehensive search of PubMed, Scopus, and Web of Science in January 2024, yielding 8,003 records, with 30 in vivo studies meeting inclusion criteria. Hepatoprotective and hypolipidemic effects were reported in 33% of studies, while antidiabetic effects were observed in 30%, and antihypertensive activity in 17%. The review notes that the overwhelming majority of qualifying studies used animal models, underscoring the need for robust human trials.

6. Body Systems and Health Areas Associated with Mung Bean

• Metabolic/Endocrine system: Blood glucose regulation, insulin sensitivity, and insulin resistance (HOMA-IR reduction demonstrated in human trials).
• Cardiovascular system: Lipid-lowering (cholesterol, TAG), blood pressure regulation via ACE-inhibitory peptides, and endothelial function improvement demonstrated in a randomized trial.
• Hepatic system: Hepatoprotective activity documented in animal models; reduction of liver enzymes (AST, ALT) and prevention of fat accumulation.
• Gastrointestinal system: TCM applications for gastrointestinal upset; dietary fiber content supporting gut health and reduced post-meal glucose absorption via enzyme inhibition.
• Immune and inflammatory: Immunomodulatory, anti-inflammatory properties via COX-2 and NF-κB pathway inhibition; TNF-α and IL-6 suppression.
• Oncological (preclinical only): Antiproliferative activity in cell lines; no human clinical cancer evidence.
• Antioxidant defense: Radical-scavenging via vitexin, isovitexin, and polyphenol content.

7. Dosage Forms and Dosages Reported in Studies

Mung bean is used in a range of preparations, and dosages in the scientific literature vary widely by form:

• Mung bean protein isolate (GLUCODIA™), human clinical trial: In the first (preliminary) human trial, mung bean protein was shown to exert physiological beneficial effects when 3.0 g were ingested per day. In the main clinical trial, higher doses were assessed; in the 6-g group, 4.4 g of 8S globulin were taken per day.
• Mung bean functional protein drink, randomized controlled trial: Participants consumed a mung bean functional drink containing 10 or 15 g of mung bean protein daily for six weeks.
• Animal/preclinical studies: Methanol extract of V. radiata seeds at 100, 200, and 400 mg/kg was administered orally for 14 days in mouse antidiabetic studies.
• Traditional Chinese Medicine decoction: The classical TCM dose cited in traditional texts is a decoction of 15–30 grams of whole mung bean.

No standardized clinical dosing recommendation has been established by any regulatory or official pharmacopeial authority for mung bean as a supplement at the time of writing.

8. Safety Considerations and Antinutritional Factors

Overall Safety Status

The EFSA Panel on Nutrition, Novel Foods and Food Allergens (NDA) concluded that mung bean protein is safe under the proposed conditions of use. In vivo toxicity studies of texturized mung bean proteins resulted in no signs of adverse effects — including plasma biochemical analysis, organ weights, and histological characteristics — in rats.

Antinutritional Factors

Trypsin inhibitors, tannins, phytic acid, saponins, and polyphenols are antinutritional substances found in mung beans that can lower their nutritional value by preventing the digestion of proteins and carbohydrates, causing problems with the liver and intestines, and binding nutrients. Lectins, phytic acid, and tannins are higher in mung bean protein isolate than in whole mung bean flour, owing to their association with the protein fraction. In mung bean flour, concentrations of tannin (8 mg/g), phytic acid (>8 mg/g), saponin (>10 mg/g), trypsin inhibitors, and α-amylase inhibitors have been reported, as well as oligosaccharides of the raffinose series (10.66 mg/g bound fructose). The presence of raffinose-series oligosaccharides can contribute to intestinal gas production in some individuals. Sprouting of seeds leads to dynamic changes in metabolites, with a decrease in antinutrient content.

Allergenicity

Vig r 1 is a mung bean protein allergen and a homologue of the major birch pollen allergen, Bet v 1. The Vig r 1 protein, found in mung bean sprouts, is reported to cause allergenic reactions in individuals with birch pollen allergy. Both Vig r 1 and Bet v 1 are members of the PR10 protein family; the food allergies associated with sensitization to PR10 proteins are generally considered to be mild. The UK Food Standards Agency recommended that the applicant conduct further allergenicity testing following sequence homology analysis, per EFSA guidance, but no further information was provided by the applicant, leaving allergenicity assessment a noted data gap. The mung bean protein is not considered a major food allergen.

Glycemic Index Considerations

Mung bean consumption can produce a small increase in the blood glycemic index in humans, which may be an unfavorable factor for some diabetic consumers depending on preparation method. Glycemic impact varies considerably with processing (whole bean vs. flour vs. sprout vs. isolated starch).

Drug and Nutrient Interactions

Phytic acid, tannins, cyanogenic glycosides, trypsin inhibitors, and lectins are present in mung bean; for phytic acid, the levels in the protein isolate are comparable with the contents in other foods and plant seed protein isolates. The chelating properties of phytic acid are well established for reducing the bioavailability of iron, zinc, and calcium when consumed together, a consideration for populations relying heavily on mung bean as a primary dietary protein source. No drug–mung bean pharmacokinetic interaction studies in humans have been identified in the published literature.

TCM-Documented Cautions

Mung bean is generally considered safe in traditional medicine; caution is noted for use in people with loose stool or diarrhea, consistent with its traditional classification as a cold, loosening food.

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