Jicama (Pachyrhizus erosus): A Comprehensive Reference
1. Identity: Botanical Classification, Names, and Forms
1.1 Botanical and Common Names
Jicama is botanically classified as Pachyrhizus erosus and belongs to the Fabaceae family, which also includes green beans, peas, black beans, and chickpeas. Three closely related species exist within the genus: Pachyrhizus erosus, P. tuberosus, and P. ahipa. It is known by various other names such as the Mexican turnip, yam bean, sweet turnip, and Mexican potato. In the Aztec language Nahuatl, jicama is referred to as Xicamatl, which translates to "watery root." The Spanish word "jícama" is the direct adaptation of this Nahuatl term. In the Philippines, it is called singkamas; in China, it appears as "bang kwang." Jicama is pronounced "HEE-kuh-muh" or "HICK-uh-muh" in English.
1.2 Morphology and Plant Description
P. erosus is a herbaceous vine with compound leaves of dark green color and various leaf shapes, from serrated to serrated-fingered, with tubers producing stems that are 2–6 meters long. The edible root is an oval-shaped tuber that resembles an onion but can also have an irregular or deformed appearance, generally weighing 1,360 to 2,700 grams and approximately 15 centimeters wide, and is often compared to potatoes because it has rough, light-brown skin with a flaky, worn texture. Peeling a jicama reveals crisp, creamy white flesh similar in texture to a pear or apple; the succulent flesh easily releases juice and has a somewhat tough and fibrous consistency. Jicama has a mildly sweet flavor with a nuttiness and crunch similar to water chestnuts.
1.3 Geographic Origin and Cultivation
This vegetable, native to Mexico and Central and South America, is classified as a legume despite its resemblance to potatoes. Outside of its native regions, jicama is a popular ingredient in Chinese, Indonesian, and Malaysian cuisine. It is mainly grown as a tuber food crop in the West Indies, Southeast Asia, India, Malaysia, Indonesia, Oman, Philippines, Australia, South America, Africa, and Pacific Islands. The agricultural advantages of the cultivated groups uniquely combine the yield reliability of a tuberous root crop with the high sustainability of a legume that promotes soil fertility through nitrogen fixation, and it easily adapts to small-farmers systems, as it can be intercropped with maize and bean, and is also used in crop rotations.
1.4 Common Forms and Preparations
The edible portion of jicama is exclusively the tuberous root. The root can be eaten raw, seasoned with lime, salt, and chili powder, or added to salads and juices. In Southeast Asia, root tubers are eaten as vegetables; the crisp white flesh can be sliced, diced, or cut into strips for use as a garnish, in salads, or with dips. It is often served as a snack, sprinkled with lime or lemon juice and a dash of chili powder. It is crispy after boiling and serves as a textural substitute for water chestnuts. Young tubers are consumed raw in salads, or cooked as a vegetable, chutney, or in pickles. In Asian cuisine, it is sometimes used as a substitute for water chestnut and paired with grilled fish or sesame oil, and it is also cooked in soups and stir-fried dishes. Beyond food applications, jicama root extract is used in certain cosmetic preparations. In Indonesia, it is used as a whitening mask by local people for centuries. The root extract of Pachyrhizus erosus is used for its moisturizing and skin conditioning properties.
2. Traditional and Historical Use
2.1 Mesoamerican Origins: Aztec and Mayan Cultures
Jicama is native to Mexico and Central America and has been used in those areas since Mayan and Aztec times. Before the Spanish conquest, indigenous groups like the Mayans cultivated jicama for its crisp texture and sweet, nutty flavor; it was not only a source of nourishment but also held cultural significance for these ancient communities, marking its importance beyond mere sustenance. Jicama has been historically valued in Mexican, Mayan, and Aztec cultures.
In Mexico, jicama is recognized as one of the four elements used in the Day of the Dead celebration on November 1st, a festival linked to its harvest along with three other elements: sugar cane, tangerines, and peanuts. The Day of the Dead centers around honoring departed relatives and friends, with altars built outside the home to create a portal inviting the deceased to share food and fellowship with the living. During the festival, jicama dolls are made from strips of paper.
2.2 Ritual and Ceremonial Significance
In ancient Mesoamerican cultures, jicama played a role in various rituals and ceremonies; its association with water and the moon made it a powerful symbol in fertility rites. In some indigenous communities, jicama was offered to the gods as part of harvest festivals. In some cultures, jicama played a role in New Year celebrations, its round shape and white flesh symbolizing the full moon and new beginnings.
2.3 Spread to Asia via Spanish Trade Routes
During the period of Spanish colonization, Spanish colonists transported the root to other parts of the world, making it popular for many traditional Asian recipes. In Southeast Asia, jicama's 16th-century arrival via Spanish routes integrated it into diverse cuisines: Vietnamese gỏi cuốn spring rolls use julienned strips for crunch, balancing flavors in family meals, and Filipino lumpia highlight its role in festive gatherings.
2.4 Traditional Medicinal Use
While jicama is primarily consumed as a food source, it has also been used in some traditional medicine practices. In some parts of Mexico and Asia, the juice from the jicama root has been used topically to soothe skin irritations and promote wound healing. The high water content of jicama makes it a cooling and refreshing food, and it has been used traditionally to alleviate thirst and prevent dehydration. These traditional claims have not been rigorously confirmed in peer-reviewed clinical studies.
Originally from the Mexican peninsula, jicama has played an important part in traditional cuisines of populations living in Central and South America, the Caribbean, and parts of Asia for thousands of years. Its seeds and leaves, while toxic, have been used outside of dietary contexts: leaves and seeds contain the toxin rotenone and may be used as an insecticide or fish poison.
3. Key Constituents and Active Compounds
3.1 Macronutrient and General Nutritional Profile
Pachyrhizus erosus, better known as jicama, is a tuberous legume mainly composed of water (87%), starch (10.7%), protein (1.3%), and fiber (1.4%). This vegetable is composed of about 86–90 percent water, so it's naturally low in calories, natural sugars, and starch — and, therefore, it has a low score on the glycemic index. Per 100 g of raw jicama, the root provides approximately 38 kcal, 8.82 g of carbohydrates (of which 1.8 g are sugars), 4.9 g of dietary fiber, 0.09 g of fat, and 0.72 g of protein, along with 20.2 mg of vitamin C.
3.2 Inulin and Fructooligosaccharides
Jicama is one of the finest sources of dietary fiber; it is particularly an excellent source of oligofructose inulin, a soluble dietary fiber. Inulin is a zero-calorie sweet inert carbohydrate; it does not undergo metabolism inside the human body, which makes jicama an ideal sweet snack for diabetics and dieters. Research has found that inulin levels in jicama decrease during root development; however, other fructooligosaccharides (notably nystose) are present at intermediate growth stages, while galacturonic acid and native starch levels increase, which relates to jicama's low glycemic index.
Inulin isolated from Pachyrhizus erosus using microwave heating has been characterized by 1H NMR studies, which reveal the presence of fructose and glucose units that form the backbone of inulin. X-ray diffractogram analysis showed that the extracted inulin has a semi-crystalline nature, suggesting its stability. The isolated inulin has been reported to contain phenolic and flavonoid content of 8.1804 ± 6.26 mg gallic acid equivalent/g and 14.387 ± 4.192 mg rutin equivalent/g of dried polysaccharide respectively.
3.3 Pectin
In jicama, the presence of pectinolytic enzymes — including polygalacturonase, pectinases, and rhamnogalacturonan — has been reported. Dietary pectin has various biological activities related to the reduction of lipid, insulin, and glucose levels, and immunomodulatory effects; it also forms a physical barrier that protects the epithelium against opportunistic microbial invasion during stress.
3.4 Vitamins and Antioxidant Compounds
A cup of jicama has more than 26 milligrams of vitamin C, close to half the recommended daily amount. Jicama also has vitamin A, vitamin E, and selenium. It also contains the antioxidants vitamin E, selenium, and beta-carotene. These compounds act as free-radical scavengers in the body. A 2021 review found that many antioxidants and phytochemicals in the jicama leaves, seeds, and tuber may help fight oxidative stress and decrease the risk of developing chronic diseases.
3.5 Minerals
Jicama contains several notable minerals. Per 100 g, it provides potassium (150 mg), calcium (12 mg), magnesium (12 mg), phosphorus (18 mg), iron (0.6 mg), and manganese (0.06 mg). It contains potassium, which may support metabolism, muscle, nerve, and kidney function, fluid balance, and bone health.
3.6 Rotenone and Toxic Isoflavonoids (Non-Edible Parts)
The seeds, pods, leaves, and stems of Pachyrhizus erosus contain toxic isoflavonoids, primarily rotenone, along with other compounds, rendering these above-ground parts poisonous if ingested. Rotenone is involved in the inhibition of the transport of electrons in the mitochondria of animals and plants. Rotenone concentration in seeds of P. erosus cultivated in Costa Rica varied between 0.0049 and 0.00718 g rotenone/g seed analyzed. Seeds of the related P. tuberosus contain three types of rotenoids — pachyrhizin, rotenone, and erosone. These compounds are entirely absent from the edible root flesh and are not a dietary concern when the root is properly peeled and consumed.
4. Mechanisms of Action
4.1 Prebiotic and Bifidogenic Mechanism
Jicama is a rich source of inulin, which is a prebiotic fiber — a carbohydrate that the human body cannot digest or absorb; instead, inulin feeds the good bacteria in the digestive tract. Prebiotics favour the growth of beneficial bacteria, particularly those that produce short-chain fatty acids (SCFAs). Increased SCFAs in the intestine are associated with slowed weight gain, protection against systemic inflammation by increasing gut barrier function, and improved glucose and lipid metabolism. Higher bacterial populations have been observed with inulin compared to glucose as a carbon source, showing nearly a 36.4% increase over 72 hours in laboratory conditions.
4.2 Glycemic Regulation Mechanisms
Research has investigated the inhibitory effect of jicama extract on α-glucosidase activity and α-amylase activity, both key enzymes in carbohydrate digestion. Jicama extract showed prominent inhibitory effects against α-glucosidase and α-amylase, with IC₅₀ values of 0.083 ± 0.004 and 0.091 ± 0.017 mg/mL, respectively.
Administration of jicama extract significantly enhanced the expressions of the phosphorylated AMP-activated protein kinase (AMPK) and Akt substrate of 160 kDa, and plasma membrane glucose transporter type 4 (GLUT4) in skeletal muscle. Activation of AMPK enhances insulin-stimulated glucose transport, resulting in improved hyperglycemia and insulin sensitivity in type 2 diabetes.
Research has classified Pachyrhizus erosus root as a low glycemic index food. The consumption of low GI foods like jicama minimizes the rate of glucose absorption, which in turn decreases insulin secretion and circulating lipids, resulting in a low postprandial glucose response, as glucose absorption in the small intestine is reduced, leading to better glycemic control.
4.3 Mechanism of Rotenone Toxicity (Non-Edible Parts)
Rotenone, found in seeds and aerial parts, inhibits the transport of electrons in the mitochondria of animals and plants. This disruption of the mitochondrial electron transport chain (Complex I) underlies the acute toxicity observed upon ingestion of seeds or other non-root parts of the plant.
5. Scientific Evidence by Health Area
5.1 Gut Health and Microbiome
Evidence level: Moderate (strong for inulin generally; limited for jicama-specific human studies).
A systematic review of studies found that inulin supports a healthy gut microbiome, and inulin in jicama is especially beneficial for people with digestive disorders.
A systematic review published in Advances in Nutrition examined the prebiotic potential of inulin-type fructans (ITFs) in healthy human adults. Studies included in the review ranged in duration up to 24 months, with doses ranging from 2.5 to 50 g/d.
A prospective pilot study in 49 individuals with prediabetes examined the effects of 15 g/day of inulin supplementation for 6 months. After 24 weeks, inulin significantly decreased fasting insulin (P=0.03) and 2-hour post-OGTT insulin (P=0.02), and improved HOMA-IR (P=0.03). Gut microbiota analysis indicated an increase in the relative abundance of Bifidobacterium, Lactobacillus, and Anaerostipes, while Alistipes decreased.
A randomized, double-blind, placebo-controlled crossover study examined the prebiotic fiber inulin in individuals undergoing hemodialysis. Twelve HD patients were randomized to consume inulin (10 g/d for females; 15 g/d for males) or maltodextrin for 4 weeks, with a 4-week washout period, to assess fecal microbiota composition and microbial metabolites.
A study established that yam bean tuber extract, used as a prebiotic, enhanced the growth of Lactobacillus plantarum. Most of these studies have been carried out in murine models, and human clinical trials specifically using jicama (rather than purified inulin from other sources) remain limited.
5.2 Blood Glucose Regulation and Diabetes
Evidence level: Preliminary — animal and in vitro studies only; no published human RCTs specific to jicama.
The use of jicama as a dietary intervention for diabetes is supported by some scientific evidence, though the strength of this evidence is limited and mostly preclinical.
A 2015 study published in PMC investigated jicama extract in STZ-induced diabetic mice. The purpose was to investigate the inhibitory effect of jicama extract on α-glucosidase and α-amylase activity. Jicama extract showed prominent inhibitory effects, with IC₅₀ values of 0.083 ± 0.004 and 0.091 ± 0.017 mg/mL respectively. The increase in postprandial blood glucose levels was more significantly suppressed in the jicama extract-administered group than in the control group.
A 2016 study in PMC (Park and Han) used the C57BL/Ksj-db/db diabetic mouse model. Male C57BL/Ksj-db/db mice were fed a regular diet (controls) or diet supplemented with jicama extract or rosiglitazone. After 6 weeks, blood levels of glucose and glycosylated hemoglobin were significantly lower in animals administered the jicama extract than the control group. Glucose and insulin tolerance tests showed that jicama extract increased insulin sensitivity. The homeostatic index of insulin resistance was lower in the jicama extract-treated group than in the diabetic control group.
A 2019 animal study (Santoso et al.) investigated jicama fiber in mice on a high-sugar diet. The study aimed to reveal whether jicama fiber (JF) could prevent the development of diabetes and obesity caused by a high-sugar diet (HSD). The JF was isolated from its tuberous part and used as a supplemental diet for adult male BALB/c mice. Four different diet paradigms — normal diet, HSD (30% sucrose), and HSD in combination with 10% and 25% of JF — were deployed continuously for 8 weeks.
A further study (Santoso et al., 2021) examined jicama fiber in mice fed a high-fat diet. Jicama fiber was effective in preventing the development of hypertrophy and hyperplasia of the islet of Langerhans, as well as ectopic fat deposition and fibrosis in the pancreas. The supplementation of jicama fiber effectively prevented T2DM development including dysregulated blood glucose and histopathological alterations of the pancreas caused by high-fat diet consumption.
Most of these studies have been carried out in murine models. No randomized controlled human trials specifically evaluating jicama root for blood glucose management have been published at the time of writing.
5.3 Weight Management and Metabolic Syndrome
Evidence level: Preliminary — animal studies only for jicama-specific data; broader inulin fiber research is more robust.
A 2019 animal study found that supplementing with jicama helped promote weight loss and prevent blood glucose spikes in mice fed a high-sugar diet. Jicama is high in fiber, which has been shown to help promote weight loss by increasing feelings of fullness, reducing appetite, and boosting metabolism. Jicama may also help promote weight loss due to its effects on insulin resistance, which is a contributor to obesity.
A single-centre, single-blinded, randomised community-based pilot trial on gut microbiota manipulation randomly assigned 60 patients (mean age 46.3 years) with metabolic syndrome to receive either inulin, inulin combined with traditional Chinese medicine, or inulin combined with metformin for 6 months. This study, while using inulin rather than whole jicama, examined outcomes directly relevant to the metabolic effects attributed to jicama's inulin content.
5.4 Antioxidant Properties
Evidence level: Preliminary — primarily in vitro and animal data.
Jicama contains several antioxidants, which are beneficial plant compounds that help prevent cell damage. It also contains the antioxidants vitamin E, selenium, and beta-carotene. Antioxidants help protect against cell damage by counteracting free radicals, the harmful molecules that cause oxidative stress. Oxidative stress has been linked to several chronic diseases, including cancer, diabetes, cardiovascular diseases, and cognitive decline.
In vitro studies have confirmed that jicama's polyphenols and vitamin C contribute to its antioxidant capacity. Research published in Food Chemistry demonstrated that extracts from jicama effectively scavenged free radicals and reduced markers of oxidative stress, supporting its role in mitigating inflammation and preventing cellular damage.
5.5 Cardiovascular Health
Evidence level: Indirect/theoretical — based on constituent properties (fiber, potassium, antioxidants); no jicama-specific human cardiovascular RCTs identified.
Jicama contains potassium, a mineral known as a vasodilator, which lowers the pressure in the circulatory system. Findings published in the American Journal of Clinical Nutrition suggested that increased potassium intake from foods like jicama is associated with lower blood pressure and a reduced risk of cardiovascular disease. Evidence for these cardiovascular benefits derives from research on jicama's constituent nutrients rather than from jicama-specific cardiovascular trials.
5.6 Colon Cancer Risk Reduction
Evidence level: Preliminary — primarily animal and cell-based data for inulin; no human RCTs specific to jicama.
Animal studies have shown that inulin has potential anticarcinogenic properties and may significantly reduce the risk of colon cancer. In human cells, inulin-derived metabolites inhibit tumor cell growth and reduce other risk factors of cancer. Jicama extracts also contain inulin, which may have anti-cancer properties. However, more research is required to substantiate this claim.
5.7 Immune Function
Evidence level: Preliminary — limited animal evidence specific to jicama; broader evidence from gut microbiome research.
Baroroh et al. (2021) demonstrated that jicama root extract (soluble fiber) could activate the adaptive immune response by improving the production of cytokines and immune factors. The proposed mechanism for immune support relates to jicama's prebiotic activity. Over 75 percent of the immune system is concentrated in the gut; by helping promote healthy gut bacteria growth and balancing the flora in the digestive system, jicama can support overall health and immunity function. This is an indirect, proposed mechanism — direct human clinical evidence specifically for jicama-derived immune outcomes is absent.
5.8 Bone Mineral Absorption
Evidence level: Preliminary — murine data; clinical evidence for inulin and calcium/mineral absorption is more established than for jicama specifically.
A study in murine models found that the insoluble residue of jicama increased the absorption of zinc and iron (Hayashi et al., 2001). Several human absorption studies have evaluated the effect of inulin/oligofructose on mineral absorption. It was shown that calcium and magnesium absorption were positively influenced. Until recently, the positive effect on iron absorption had been shown only in animal studies.
5.9 Topical and Cosmetic Uses
Evidence level: Traditional/anecdotal — insufficient peer-reviewed clinical evidence for efficacy claims.
While jicama is primarily consumed as a food source, in some parts of Mexico and Asia the juice from the jicama root has been used topically to soothe skin irritations and promote wound healing. In Indonesia, it is used as a whitening mask by local people for centuries, and it is said that the jicama mask belongs to the beauty routine of royal women in order to bring radiance to their skin. Scientific evidence supporting these traditional uses is limited, and further research is needed to confirm their effectiveness.
6. Body Systems and Health Areas Associated with Jicama
- Gastrointestinal system: Prebiotic fiber (inulin, fructooligosaccharides) supports gut microbiome diversity and regularity; pectin contributes to mucosal protection.
- Endocrine/metabolic system: Low glycemic index; animal evidence for inhibition of carbohydrate-digesting enzymes (α-glucosidase, α-amylase) and AMPK activation; fiber reduces postprandial glucose response.
- Cardiovascular system: Potassium content linked to blood pressure regulation; fiber associated with cholesterol management; antioxidant content linked to vascular protection.
- Immune system: Prebiotic activity supports the gut-associated immune system; one animal study indicates activation of adaptive immune responses via cytokine induction.
- Musculoskeletal system: Inulin-facilitated mineral absorption (calcium, magnesium, zinc, iron) relevant to bone mineral density; animal evidence only for jicama specifically.
- Integumentary system (topical): Traditional use as a topical agent for skin brightening and hydration in Mexico and Southeast Asia; vitamin C content underpins collagen biosynthesis; evidence is largely traditional/anecdotal.
7. Dosage Forms and Reported Dosages
Jicama is consumed primarily as a whole food rather than in standardized supplement form. Dosages used in scientific investigations of jicama specifically, or of its principal bioactive compound inulin, are noted below exactly as reported in sources:
- In an animal study examining postprandial blood glucose, jicama extract was administered orally at 200 mg/kg alongside acarbose (100 mg/kg) as comparator.
- In a murine metabolic study, jicama fiber was used as a supplemental diet at 10% and 25% of total dietary composition combined with a high-sugar diet (30% sucrose) continuously for 8 weeks.
- In a prospective human study in subjects with prediabetes (n=49), each subject received a daily supplement of 15 g of inulin for 6 months.
- In a randomized, double-blind, placebo-controlled crossover study in hemodialysis patients, participants were randomized to consume inulin at 10 g/day for females and 15 g/day for males for 4 weeks, with a 4-week washout period.
- A clinical trial on inulin-type fructans and gut microbiota is studying supplementation with 12 g/day of inulin-type fructans on gut microbiota, gastrointestinal sensation, bowel habits, and mood, with maltodextrin (6 g/day) as placebo.
- In a systematic review of inulin-type fructan clinical trials, doses across studies ranged from 2.5 to 50 g/day.
No standardized dosage of jicama for therapeutic use has been established by any regulatory body or pharmacopeia. All dosages above are strictly those reported in cited experimental or clinical investigations.
8. Safety Considerations and Known Toxicological Concerns
8.1 Edible Root Is Safe; Aerial Parts Are Toxic
Only the tuber is safe to eat. The seeds, pods, stems, and leaves contain rotenone, a natural insecticide that is toxic to humans and pets if ingested. Only the root of the jicama plant is safe to eat, as the rest of the plant contains natural toxins.
8.2 Rotenone Toxicity from Non-Edible Parts
Rotenone is involved in the inhibition of the transport of electrons in the mitochondria of animals and plants. Gao et al. (2009) reported a food poisoning case caused by the consumption of seeds from P. erosus. The seeds are known for their acaricidal and insecticidal properties due to rotenone and other isoflavonoid contents. Rotenone has exhibited cytotoxic activity against several human tumor cell lines, though its mechanism of action is still not fully understood. In a study, rotenone isolated from P. erosus seeds showed significant cytotoxic activity (IC₅₀ = 13.05 μM) against K562 human leukaemia cells, as determined by MTT assay. This cytotoxicity pertains to the isolated compound from non-edible parts and does not apply to the edible root.
8.3 Gastrointestinal Tolerability of Inulin
Inulin, as the principal prebiotic compound in jicama, can cause gastrointestinal symptoms at higher doses. Clinical research on inulin-type fructan supplementation specifically monitors for gastrointestinal sensations including flatulence, intestinal bloating, abdominal pain, and abdominal pressure as recognized adverse effects of prebiotic supplementation. These effects are dose-dependent and are a recognized feature of fermentable fibers generally.
8.4 Potential for Skin Irritation (Peel)
It is not advisable for people to eat the outer peels of jicama. It protects itself from being eaten by hungry animals with a highly toxic compound in the peels. The peel should always be fully removed before consumption.
8.5 Drug Interactions
No specific drug interaction data for the jicama root itself has been identified in the peer-reviewed literature reviewed here. Given jicama's effects on α-glucosidase and α-amylase inhibition identified in animal studies, and its documented influence on AMPK signaling and GLUT4 expression, caution may be warranted when consuming large quantities alongside antidiabetic medications — though this has not been established in human clinical research. Evidence for this potential interaction is strictly preclinical.
8.6 Populations of Note
Jicama has a very high water content (approximately 86–90 percent), meaning consuming it in large amounts could contribute to significant fluid intake — a theoretical consideration for individuals requiring fluid restriction (e.g., patients on hemodialysis). No published human data directly addresses this concern for jicama specifically.
References
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