nuez de pan

This tree is found on the west coast of central Mexico and in southern Mexico (Yucatán, Campeche), Guatemala, El Salvador, the Caribbean, and the Amazon basin. Large stands occur in moist lowland tropical forests at 300–2000 m elevation (especially 125–800 m), in humid areas with rainfall of 600–2000 mm, and average temperatures of 24 °C.

1.1 Morphology

The tree can grow up to 45 m in height and up to 1.5 m in diameter. It starts producing flowers and fruits when the tree's trunk reaches 20 m high. A tree can produce 150–180 kilograms of fruits per year and stays productive for 120–150 years. Brosimum alicastrum can be monoecious, dioecious, or hermaphroditic, changing from female to male as they age.

The tree produces spherical fruits, 1.5–2.5 cm in diameter, containing a single edible seed that weighs about 3 grams and is covered by a thin yellowish peel. It has a large seed covered by a thin, citrus-flavored, orange-colored skin favored by a number of forest creatures. Scientifically the Maya nut is not actually a nut, but a drupe, which is any fruit consisting of an outer skin, a pulpy middle layer, and a woody inner shell enclosing a single seed.

1.2 Common Preparations and Forms

The seeds can be eaten raw, boiled, or roasted. They taste somewhat like potatoes. Breadnut seeds can be ground and used in mixture with maize meal to make tortillas. Stewed, the nut tastes like mashed potato; roasted, it tastes like chocolate or coffee. In Petén, Guatemala, the breadnut is cultivated for exportation and local consumption as powder, for hot beverages, and bread.

The primary commercial form encountered as a dietary supplement or functional food ingredient is a roasted and milled seed powder. The fruit contains an edible seed, generally called Maya nut, which may be used as dried or roasted, ground into powder, and incorporated into baked goods. Gluten ELISA analysis has confirmed that Ramon flour is gluten-free.

Beyond the seed, its protein-rich seeds and leaves may be used for food and forage, and several medicines and beverages can be made from parts of the tree. Breadnut trees are also tapped for their milky latex, which is used to make chicle, the basis for chewing gum.

2. Traditional and Historical Use

2.1 Maya Civilization

Brosimum alicastrum, which used to be cultivated and used as a subsistence food by the ancient Mayan Civilization from 300 to 900 A.D., is a tree member of the Moraceae family of edible botanicals. Numerous sources report that the tree was an important food source for the Maya and was widely cultivated as such. One source states, "Corn and Brosimum alicastrum were probably the main food sources for the Mayas of the classical period, one of the most advanced ancient civilizations of the American continent."

Some anthropologists suggest that the Maya managed their forests in order to maintain a constant source of B. alicastrum. Large assemblages of this plant species have been found in the old ruins of city-states in the Yucatan peninsula, Chiapas, and Tabasco states of Mexico, as well as in Guatemala. The tree lends its name to the Maya archaeological sites of Iximché and Topoxte, both in Guatemala. It is one of the 20 dominant species of the Maya forest.

It's called iximche in some Mayan languages, meaning literally "maize tree," reflecting its importance especially in lean times. Referred to as the "corn tree" by the Maya, its nut was a staple food crop, capable of being stored for lengthy periods of time. Mayans used breadnut seeds to prepare native bread when maize flour was scarce.

2.2 Archaeological Evidence

Researchers have long argued that the ancient Maya actively exploited forest resources. Charcoal analysis at the Classic site of Naachtun (Northern Guatemala) systematically analyzed the use of the breadnut and sapodilla trees for domestic firewood over eight centuries. These two species are among the most economically and ecologically valuable for modern Maya people and have been at the core of the debate concerning ancient Maya subsistence economy.

2.3 Traditional Medicinal Uses

Maya nuts have a rich history of human use as a food source going back to the classical Mayan period; ancient Mayans used every part of the B. alicastrum tree including its bark, leaves, and nuts. The sap from the tree was used by the Mayans to cure stomach and digestive problems, to detoxify the liver, and to promote lactation in nursing women. Traditional knowledge of breadnut is particularly high in Chiapas, Mexico, where it is reported to be used as forage, shade provider, fuelwood, live fence, construction, and ethnomedicine.

Brosimum alicastrum is a large, evergreen tropical tree widely distributed in Mexico. Its protein-rich seeds and leaves may be used for food and forage, and several medicines and beverages can be made from parts of the tree. Although an important alternative food in pre-Columbian times, the current use of the tree is very limited.

2.4 Caribbean and Wider Regional Use

Brosimum alicastrum originated from southeast Mexico and several countries in Central America. It is also often found in Jamaica and Cuba. The seed's use extended throughout the Caribbean as a food staple, and the tree's introduction into various island ecosystems brought with it traditional knowledge of its culinary preparations. Breadnut trees are well adapted to humid climates but they do extremely well in dry areas where they are used as a source of forage (leaves and small branches) for ruminants during the dry season.

3. Key Nutritional Constituents and Active Compounds

3.1 Macronutrients

These seeds are highly nutritious, providing 8.8–12.1% protein, 0.5–2.0% fat, 79.4–85.9% carbohydrates, significant dietary fiber (up to 22%), and essential minerals such as calcium (189–829 mg/100 g), potassium (up to 2609 mg/100 g), iron (up to 60 mg/100 g), and zinc (up to 6 mg/100 g), along with vitamins A, B, C, and folic acid.

Independent laboratory analysis of roasted seed provides more specific values. Nutritional composition for the roasted seed on a dry weight basis for protein, fat, carbohydrates, ash, dietary fiber, and crude fiber was 11.48%, 0.75%, 79.42%, 4.06%, 14.04%, and 4.30%, respectively. The dried, ground seeds contain more protein than corn.

3.2 Glycemic Index

The Maya nut is high in fiber, calcium, potassium, iron, zinc, protein, and B vitamins. It has a low glycemic index (<50) and is very high in antioxidants and prebiotic fiber. A glycemic index below 50 places breadnut in the low-GI category, a characteristic attributed in part to its high dietary fiber and resistant starch content.

3.3 Phenolic Compounds and Antioxidants

Breadnut Brosimum alicastrum is known to contain bioactive compounds and has been used for medicinal and food purposes for millennia. A comparison has been made between the proximal chemical composition, phytochemical content, in vitro antioxidant capacity, and individual phenolic compounds in B. alicastrum leaf, seed, seed coat, and fruit peel.

Total phenolic content (TPC) was highest in seeds (19.74 mg gallic acid equivalent GAE/g) and total flavonoids content (TFC) was highest in leaves (16.62 mg quercetin equivalent QE/g). The highest DPPH antioxidant capacity was identified in seed coat and the highest reducing power in leaf and fruit peel. Individual phenolic compounds concentration varied between the tissues, with leaves having the highest caffeic acid and ellagic acid contents.

Regarding specific phenolic acids, HPLC analysis of the ramon nut has identified gallic acid, chlorogenic acid, and vanillic acid as prominent individual phenolic compounds. Phytochemical screening has also revealed abundant terpenes and tannins in leaf tissue, and abundant sterols in seed coat.

3.4 Amino Acid Profile, Including Tryptophan

The fruits have zero fat and are gluten-free, and are used to make gluten-free flours, which are very high in fiber, potassium, calcium, folic acid, iron, zinc, protein, B vitamins, and tryptophan, the amino acid that helps calm stress and anxiety.

Anti-nutritional factors (ANFs) including saponins (961.10–1337.58 mg DE/100 g), tannins (12.67–208.66 mg CE/100 g), phytic acid (1327.88–3592.51 mg/100 g), and oxalates (365.08–1431.48 mg CaC₂O₄/100 g) varied by processing. In vitro digestibility-corrected amino acid scores (25.05–47.85%) confirmed low to moderate digestibility. This finding is relevant for evaluating breadnut as a functional protein source and underscores the importance of processing (roasting, drying) to reduce anti-nutritional factors.

3.5 Latex Constituents

The leaves and sap are used to stimulate breast milk production. The sap is rich in alkaloids — strong chemical substances which can be effective in fighting illnesses. The white milky latex of B. alicastrum is distinct from the latex of pharmacologically studied relatives in the Brosimum genus and its specific alkaloid composition in B. alicastrum has not been extensively characterized in the peer-reviewed literature to date.

4. Scientific Evidence by Health Area

The overall body of scientific evidence for breadnut as of the mid-2020s consists predominantly of in vitro (cell-free laboratory) studies, animal models, and a small number of human observational or pilot intervention studies. No large randomized controlled trials (RCTs) have been published as of the most recent literature search. Evidence should therefore be interpreted as preliminary, and mechanistic findings from animal or cell studies cannot be directly extrapolated to clinical outcomes in humans.

4.1 Nutritional Status and Elderly Populations (Human Clinical Evidence)

The most directly relevant human intervention study to date examined B. alicastrum seed flour incorporated into functional foods for elderly individuals. The aim was to evaluate the functionality of foods added with Brosimum alicastrum Sw. seed flour in elderly individuals (EI). EI (n = 23) living in nursing home conditions agreed to participate. A control stage was carried out (30 days) and subsequently, an intervention stage (30 days) was realized in which a muffin and a beverage, designed for EI, were added to the participants' usual diet.

Ramón seed flour improved the nutritional status of the elderly participants, preserved their energy and muscle reserves and increased their intake of protein, dietary fiber, iron, zinc, folate, and reduced cholesterol and sodium. The results showed that the consumption of the foods improved the energy intake and preserved the muscle reserves of the EI.

Limitations: This was a single-arm, before-and-after intervention with only 23 participants, conducted in a nursing home setting. The absence of a randomized control group, blinding, and larger sample size significantly limits the strength of these findings. Results cannot be generalized beyond institutionalized elderly populations consuming the specific food vehicles tested.

4.2 Lipid Metabolism and Hepatic Protection (Animal Evidence)

A 2023 preclinical study investigated the metabolic effects of ramon flour in a high-fat-diet-induced obesity mouse model. The study aimed to determine the metabolic effects of RF consumption. Male BALB/c mice were divided into four groups (n = 5 each group) and fed for 90 days with control diet (AIN-93), control diet adjusted with 25% RF, high-fat diet (HFD) + 5% sugar in water, and HFD adjusted with 25% RF + 5% sugar in water.

The RF prevented the increase in serum total cholesterol (TC) and alanine transaminase (ALT) that occurred in the control and HFD groups. Notably, RF together with HFD increased serum polyphenols and antioxidant activity, and it promoted a decrease in the adipocyte size in white adipose tissue, along with lower hepatic lipid accumulation. The results showed that Ramon flour prevents biochemical alterations, lipid accumulation in liver, and hypertrophy of white adipose tissue, induced by obesity.

Limitations: This study is entirely preclinical, conducted in mice with very small group sizes (n = 5 per group). BALB/c mouse models of diet-induced obesity do not fully replicate human metabolic disease. The dietary intervention level of 25% RF represents an unusually high proportion of total diet that may not be practically achievable or safe at equivalent doses in humans. No human translation is possible at this stage.

4.3 Hypolipidemic and Antioxidant Effects — Comparison Across Processing Methods (Animal Evidence)

Brosimum alicastrum is a traditional Mesoamerican resource with nutritional potential exceeding many cereal grains, yet its therapeutic efficacy relative to processing remains under-researched. One study investigated the impact of geographic origin and processing on its hypolipidemic and antioxidant properties. Seed flours from Campeche (green raw), Nayarit (dried), and Yucatán (commercial roasted) were evaluated. Following proximal analysis and acute toxicity screening (up to 2000 mg/kg), effects were tested in a tyloxapol-induced hypertriglyceridemia rat model monitoring triglyceride (TG) and hepatic oxidative stress (OS) biomarkers.

All samples were non-lethal, and, significantly, dried (DsF) and roasted (RsF) flours achieved a maximum reduction of TG and protein carbonyl content (PCC) at only 200 mg/kg, whereas raw GsF required 2000 mg/kg. This finding indicates that processing significantly enhances the bioavailability and bioactivity of breadnut's lipid-modulating constituents.

Limitations: This is a rat pharmacological model of chemically induced hypertriglyceridemia (tyloxapol injection), not a dietary model of metabolic disease. Dose-response relationships established in rodents are not predictive of human therapeutic dosages. No human data are available.

4.4 Antioxidant Capacity: In Vitro Evidence

Ramon nut is a vegetable product of significant importance in the Mayan culture. The effect of seven solvent systems on the content of total phenolic compounds (TPC), extraction yield, total flavonoids (TF), and antioxidant activity was evaluated, and the content of individual phenolic compounds was analyzed by HPLC. The type of solvent and its polarity has a significant effect on the extraction of antioxidants. The ethanol/water extract (1:1, v/v) was identified as the most efficient solvent in the extraction process, with a higher TPC content, greater antioxidant activity, and a higher content of gallic acid, chlorogenic acid, and vanillic acid.

Predicted TPC and TMA optimum levels (45.18 mg GAE/g and 15.16 mg CyE/100 g) were obtained at 28 °C, 80% power, and 20–10 min extraction. DPPH obtained a maximum value (67.27 μmol TE/g) under the same optimization conditions.

Proximal chemical composition and bioactive compounds contents differed between B. alicastrum tissues, but they all contain bioactive compounds with antioxidant potential, highlighting their potential applications in industrial systems.

Limitations: All antioxidant data cited are from in vitro laboratory extractions and assays (DPPH, ABTS, reducing power). In vitro antioxidant activity does not predict bioavailability or antioxidant effects in living systems. Radical-scavenging assays are useful for comparative purposes but have limited translational value for human health claims.

4.5 Wheat Flour Fortification — Nutritional and Functional Properties

A study published in Foods (2019) examined the effect of partially replacing wheat flour with ramón seed flour (RSF) in wheat flour tortillas. RSF is an underutilized natural resource rich in fiber, minerals, and bioactive compounds that can be used to improve properties of starchy foods, such as wheat flour tortilla. The RSF-containing tortilla showed improved fiber, mineral content, and antioxidant capacity relative to standard wheat flour tortillas. This research is primarily applied food science rather than a clinical health outcomes study, with no clinical endpoints measured.

4.6 Blood Glucose Regulation (Preliminary Evidence)

The reported low glycemic index (<50) of breadnut seeds, combined with its high dietary fiber content, provides a theoretical mechanistic basis for interest in blood glucose modulation. However, the low GI value cited in multiple sources has not, to the researcher's knowledge, been established by formal GI testing protocols (e.g., ISO 26642:2010) in peer-reviewed studies with human subjects. Assertions about blood sugar regulation from leaf preparations remain at the level of traditional use claims without clinical trial support.

4.7 Bone and Mineral Nutrition

The exceptionally high calcium content reported for breadnut seeds — 189–829 mg/100 g — has attracted interest in the context of bone health and osteoporosis prevention, particularly among populations in Central America where dairy consumption may be limited. However, no clinical trial has specifically evaluated the effect of breadnut consumption on bone density or calcium bioavailability in humans. The wide range of reported calcium values (more than fourfold variation) suggests significant variation by geographic origin, soil conditions, and analytical methodology.

5. Body Systems and Health Areas of Association

• Cardiovascular/lipid metabolism: Animal evidence for triglyceride- and cholesterol-lowering effects. No human clinical trial data.
• Hepatic function: Preclinical mouse data suggesting protection against diet-induced hepatic lipid accumulation and ALT elevation.
• Gastrointestinal system: High prebiotic fiber content; traditional use for digestive complaints. No controlled human studies.
• Musculoskeletal system: High calcium content relevant to bone health; traditional use for arthritis-related conditions. No controlled human studies.
• Nutritional status and sarcopenia: Single small pilot study in elderly showing preserved muscle reserve with seed flour supplementation.
• Oxidative stress: Well-documented in vitro antioxidant activity; one human pilot study showing increased plasma antioxidant capacity.
• Neuroendocrine/mood: Contains tryptophan, the dietary precursor to serotonin and melatonin, providing a theoretical mechanism for mood and sleep modulation; no clinical trials.
• Lactation: Traditional Mayan use of sap and leaves to promote breast milk production; no clinical data.

6. Dosage Forms and Dosages Reported in Studies

The following dosages and delivery forms appear in the peer-reviewed literature and should not be interpreted as therapeutic recommendations. They reflect only what has been used in the cited investigations.

• Human pilot study (elderly, 2021): Elderly individuals (n = 23) living in nursing home conditions received, during a 30-day intervention stage, a muffin and a beverage designed for elderly individuals, both added with Brosimum alicastrum Sw. seed flour, in addition to their usual diet. The exact gram amount of seed flour per serving was not reported in the available abstract.
• Mouse model (2023): Male BALB/c mice were fed for 90 days with control diet adjusted with 25% RF (ramon flour) or high-fat diet adjusted with 25% RF + 5% sugar in water.
• Rat hypertriglyceridemia model (2026): Dried and roasted seed flours achieved a maximum reduction of TG and protein carbonyl content at 200 mg/kg, whereas raw flour required 2000 mg/kg body weight in the rodent model.
• Traditional food uses: Breadnut seeds can be ground and used in mixture with maize meal to make tortillas. Mayans use breadnut seeds to prepare native bread when maize flour is scarce. No standardized dose is associated with traditional food use.

No standardized dietary supplement dosage for breadnut has been established by any regulatory body, and no minimum effective dose has been defined in human clinical research.

7. Safety Considerations

7.1 General Safety and GRAS Status

The safety of the Maya Nut and powder derived from dried or roasted Maya Nut is primarily supported by a well-established and safe history of use of the ingredients as a traditional food in the diets of native populations of South and Central America. A Generally Recognized as Safe (GRAS) Self-Affirmation Report entitled 'Ramón Seed (Brosimum alicastrum sw.) and Ramón Seed-Derived Ingredients for use in Traditional Foods' was produced by T. Flaster (2007), Executive Director of Botanical Liaison, LLC. Note that a GRAS self-affirmation is not the same as an FDA-reviewed GRAS determination; it represents the opinion of qualified experts without formal FDA review.

7.2 Acute Toxicity

Following proximal analysis and acute toxicity screening up to 2000 mg/kg in a rat model, all samples were non-lethal. The significance of this finding is limited because the LD₅₀ was not reached at the maximum tested dose (2000 mg/kg), which means the lethal threshold was not established, and these findings are from animal models, not humans.

7.3 Anti-Nutritional Factors

Processing significantly affects the anti-nutritional factor (ANF) load and protein quality of breadnut. Saponins (961.10–1337.58 mg DE/100 g), tannins (12.67–208.66 mg CE/100 g), phytic acid (1327.88–3592.51 mg/100 g), and oxalates (365.08–1431.48 mg CaC₂O₄/100 g) varied by processing. In vitro digestibility-corrected amino acid scores (25.05–47.85%) confirmed low to moderate digestibility. The high phytic acid content is particularly relevant as phytate binds to divalent minerals (calcium, iron, zinc) and can significantly reduce their bioavailability. Roasting substantially reduces these ANFs compared to raw seed.

7.4 Allergenicity

Ramon seed comes from a large rainforest tree in the order Rosales (which includes almonds and peaches). Though novel in the U.S., it has been consumed in certain parts of Latin America for decades. Though distantly related to any known allergenic tree nut, the potential allergenicity of ramon seed was investigated by targeted serum screening with sera from almond- and walnut-allergic individuals, the two most commonly allergenic tree nuts in North America. Ramon seeds do not contain tree allergens like almonds, walnuts, and pecans. However, the allergenicity investigation cited used immunological assays rather than oral challenge studies; individuals with known tree nut allergies should exercise caution pending more definitive clinical allergy studies.

7.5 Gluten-Free Status

Gluten ELISA analysis confirmed Ramon flour is gluten-free, making it a candidate for use in celiac disease and non-celiac gluten sensitivity dietary management, subject to adequate controls for cross-contamination during processing.

7.6 Drug and Supplement Interactions

No peer-reviewed clinical data are available on pharmacokinetic interactions between breadnut preparations and pharmaceutical drugs. The high phytic acid content of unprocessed or insufficiently processed breadnut may theoretically reduce the absorption of co-administered mineral supplements (calcium, iron, zinc) if consumed concurrently. This interaction has not been studied specifically for breadnut in clinical settings; it is inferred from the established interaction chemistry of dietary phytates.

7.7 Latex and Tree-Related Considerations

The wood is used for making furniture, while its milky latex is used in chewing gums. Individuals with latex sensitivity should be aware that B. alicastrum produces milky latex, though cross-reactivity between dietary seed preparations and natural rubber latex proteins has not been investigated in this species.

8. Relationship to Other Brosimum Species

It is important to distinguish Brosimum alicastrum from pharmacologically distinct relatives within the genus. Brosimum gaudichaudii has been exploited by the pharmaceutical industry as a source of psoralens for the treatment of immunologic disorders. Another species, Brosimum acutifolium, is a large tree with high medicinal and pharmacological value, widely used in folk medicine by some communities in South America and northern Brazil, as a potent antirheumatic, antiarthritic, and anti-inflammatory. Chemical and biological data from these related species cannot be assumed to apply to B. alicastrum.

9. Current Research Status and Knowledge Gaps

Ramon seed is a traditional Mayan food used to obtain Ramon flour with high biological value in terms of protein, fiber, micronutrients, and bioactive compounds such as polyphenols. However, few studies have evaluated the beneficial effects of RF. Brosimum alicastrum is a traditional Mesoamerican resource with nutritional potential exceeding many cereal grains, yet its therapeutic efficacy relative to processing remains under-researched.

Major knowledge gaps include: (1) the absence of randomized controlled trials with adequate sample sizes for any specific health claim; (2) undetermined bioavailability of minerals given high phytic acid content in human subjects; (3) lack of formal glycemic index determination by ISO methodology; (4) unknown pharmacokinetics of phenolic compounds from breadnut in humans; (5) no studies on safety or efficacy during pregnancy; and (6) limited data on potential drug-food interactions. These results highlight Ramon seeds as a sustainable, nutrient-dense, gluten-free protein source suitable for functional food applications, addressing future protein security needs — a characterization that accurately reflects the current state of the evidence: primarily nutritional and functional food potential, rather than established therapeutic application.

References

• Wikipedia — Brosimum alicastrum
• Grokipedia — Brosimum alicastrum (with sourced nutritional data)
• Feedipedia — Breadnut (Brosimum alicastrum)
• Peters & Pardo (1982) — Brosimum alicastrum (Moraceae): Uses and Potential in Mexico. Economic Botany 36:166–175
• Rodríguez-Tadeo et al. (2021) — Functionality of Bread and Beverage Added with Brosimum alicastrum Sw. Seed Flour on the Nutritional and Health Status of the Elderly. Foods 10(8):1764. PMC8394985
• Cu-Cañetas et al. (2023) — Ramon Flour (Brosimum alicastrum Swartz) Ameliorates Hepatic Lipid Accumulation, Induction of AMPK Phosphorylation, and Expression of the Hepatic Antioxidant System in a High-Fat-Diet-Induced Obesity Mouse Model. Antioxidants 12(11):1957. PMC10669741
• Ozer HK (2019) — Effect of Extraction Solvent on the Phenolic Compounds Content and Antioxidant Activity of Ramon Nut (Brosimum alicastrum). Chemical Papers
• PMC6151988 — Optimization of the Ultrasound-Assisted Extraction of Phenolic Compounds from Brosimum alicastrum Leaves and the Evaluation of Their Radical-Scavenging Activity
• JAPS — Comparison of Proximate Composition, Phytochemical Contents, Antioxidant Capacity and Polyphenols in Brosimum alicastrum Leaf and Fruit Tissues
• PMC6963599 — Brosimum alicastrum Sw. (Ramón): An Alternative to Improve the Nutritional Properties and Functional Potential of the Wheat Flour Tortilla. Foods 2019;8:613
• PMC12447510 — Nutritional Value, Antinutritional Factors, and Protein Quality of Brosimum alicastrum Seeds: A Sustainable Protein Source
• In Vivo Hypolipidemic and Antioxidant Potential of Brosimum alicastrum Swartz: Comparison Between Different Raw, Dried, and Roasted Seed Flours with Acute Toxicological Validation (2026)
• Flaster T. (2007) — Maya Nut (Brosimum alicastrum SW.) and Maya Nut-Derived Ingredients for Use in Traditional Foods: GRAS Self-Affirmation Report
• Ancient Maya sylviculture of breadnut at Naachtun, Guatemala: A reconstruction based on charcoal analysis
• Maya Nut Institute — The Curious Case of Brosimum alicastrum
• Investigations of the Potential Allergenicity of Ramon Seed Powders (ResearchGate)
• Clemson University Thesis — Chemical and Functional Properties of Brosimum alicastrum Seed Powder (Maya Nut, Ramón Nut)
• PMC11047426 — Effect of Brosimum alicastrum Foliage on Intake, Kinetics of Fermentation and Passage and Microbial N Supply in Sheep