# Lima Bean (Phaseolus lunatus)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/lima-bean
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-24
**Evidence Score:** 2 / 10
**Category:** Legume
**Also Known As:** Phaseolus lunatus, butter bean, Madagascar bean, sieva bean, Chad bean, double bean, curry bean

## Overview

Lima bean (Phaseolus lunatus) is a legume rich in protein with notable lysine content (79.7 g/kg protein) and phenolic compounds including quercetin, gallic acid, catechin, and rutin. These bioactives contribute to [antioxidant activity](/ingredients/condition/antioxidant) and nutritional value, though most evidence remains biochemical or in vitro rather than from human clinical trials.

## Health Benefits

• Protein source with high lysine content (79.7 g/kg protein) - based on biochemical analysis only, no clinical trials • [Antioxidant activity](/ingredients/condition/antioxidant) from phenolic compounds (quercetin, gallic acid, catechin, rutin) showing 13.22% DPPH radical scavenging in hydrolysates - in vitro evidence only • Lower toxicity compared to other beans when cooked - based on 12-day rat feeding trials, no human data • Rich in polyunsaturated fatty acids (69.8% of total fatty acids) - compositional data only, no clinical outcomes • Mineral content including zinc and iron, though bioavailability is reduced by phytates - no human absorption studies

## Mechanism of Action

Phenolic compounds in lima beans, particularly quercetin and rutin, inhibit free radical chain reactions by donating hydrogen atoms to [reactive oxygen species](/ingredients/condition/antioxidant), demonstrated by 13.22% DPPH radical scavenging activity in protein hydrolysates. Gallic acid and catechin act as electron donors, chelating transition metal ions that catalyze oxidative reactions via Fenton chemistry. Lima bean lectins and protease inhibitors may additionally modulate [digestive enzyme](/ingredients/condition/gut-health) activity, potentially influencing glucose absorption rates by inhibiting alpha-amylase.

## Clinical Summary

Available evidence for lima bean health effects is predominantly preclinical, consisting of biochemical compositional analyses and in vitro assays rather than randomized controlled trials in humans. [Antioxidant](/ingredients/condition/antioxidant) capacity has been quantified at 13.22% DPPH radical scavenging in hydrolysate fractions, with no published human trials establishing clinical antioxidant outcomes. Protein quality studies confirm high lysine content at 79.7 g/kg protein, making lima beans a potentially valuable complementary protein source, but bioavailability in human subjects has not been rigorously quantified. The overall evidence base is insufficient to support therapeutic claims, and lima beans are currently best characterized as a functional food ingredient pending further clinical investigation.

## Nutritional Profile

{"macronutrients": {"protein": "21.46 g per 100 g", "fiber": "7.0 g per 100 g", "fat": "0.69 g per 100 g", "carbohydrates": "63.38 g per 100 g"}, "micronutrients": {"vitamins": {"vitamin_C": "23.4 mg per 100 g", "folate": "395 \u00b5g per 100 g", "thiamin": "0.507 mg per 100 g"}, "minerals": {"iron": "7.51 mg per 100 g", "magnesium": "93 mg per 100 g", "potassium": "1724 mg per 100 g", "phosphorus": "285 mg per 100 g"}}, "bioactive_compounds": {"phenolic_compounds": {"quercetin": "0.5 mg per 100 g", "gallic_acid": "0.3 mg per 100 g", "catechin": "0.2 mg per 100 g", "rutin": "0.1 mg per 100 g"}}, "bioavailability_notes": "Lysine content is high, enhancing protein quality. Cooking reduces antinutritional factors such as phytic acid, improving mineral absorption. Phenolic compounds contribute to [antioxidant activity](/ingredients/condition/antioxidant) but are primarily evidenced in vitro."}

## Dosage & Preparation

No clinically studied dosage ranges for extracts, powders, or standardized forms of lima bean were found. Traditional consumption involves whole cooked seeds, with processing (cooking, soaking) recommended to reduce antinutrients and improve protein utilization. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Raw or improperly prepared lima beans contain cyanogenic glycosides, particularly linamarin and lotaustralin, which can release hydrogen cyanide upon hydrolysis; thorough cooking effectively neutralizes this toxicity and is mandatory before consumption. Lima beans contain moderate levels of phytic acid and trypsin inhibitors that may reduce mineral absorption and protein digestibility, a concern primarily in populations with marginal micronutrient status. Individuals with legume allergies, particularly those sensitive to Fabaceae family plants, may experience cross-reactive allergic responses including urticaria or gastrointestinal distress. No well-documented drug interactions have been established in clinical literature, though the high fiber content could theoretically slow absorption of orally administered medications if consumed simultaneously; pregnant women may consume cooked lima beans safely as part of a balanced diet.

## Scientific Research

No human clinical trials, RCTs, or meta-analyses on Phaseolus lunatus were identified in the research. Available evidence consists of rat feeding trials showing non-toxicity over 12 days and biochemical composition analyses, but these lack human data or PMIDs for clinical outcomes.

## Historical & Cultural Context

Lima beans have been used as a staple food in Central and South American indigenous diets for protein and carbohydrates. Historical recommendations encouraged autoconsumption by small farmers due to better lysine availability and lower toxicity when cooked compared to other legumes.

## Synergistic Combinations

Other legumes, [digestive enzyme](/ingredients/condition/gut-health)s, vitamin C (for iron absorption), probiotics, zinc

## Frequently Asked Questions

### Are lima beans a complete protein?

Lima beans are not a complete protein by strict definition, as they are relatively low in methionine and cysteine (sulfur-containing amino acids), though they have exceptionally high lysine content at 79.7 g/kg protein. Pairing lima beans with grains such as rice, which are methionine-rich but lysine-poor, creates a complementary amino acid profile approaching completeness. This complementarity makes lima beans particularly valuable in plant-based diets.

### Are raw lima beans poisonous?

Yes, raw lima beans contain cyanogenic glycosides—primarily linamarin and lotaustralin—that enzymatically release hydrogen cyanide when bean tissue is disrupted. North American commercial varieties contain lower concentrations than some tropical cultivars, but thorough boiling with water discarded afterward is necessary to safely neutralize this risk. Slow-cooker preparation without prior boiling is not recommended, as inadequate heat can paradoxically increase cyanide release.

### What antioxidants are in lima beans?

Lima beans contain several phenolic antioxidants including quercetin, gallic acid, catechin, and rutin, found primarily in the seed coat and concentrated in protein hydrolysate fractions. In vitro testing has measured DPPH free radical scavenging activity at 13.22% in hydrolysates, reflecting moderate antioxidant capacity compared to other legumes. These compounds act through hydrogen atom transfer and metal chelation mechanisms, though their bioavailability and in vivo antioxidant effects in humans have not been clinically validated.

### How much protein is in lima beans?

Cooked lima beans contain approximately 7–8 grams of protein per 100-gram serving, with a notably high lysine content measured at 79.7 g per kilogram of total protein, making them one of the better plant sources of this essential amino acid. Raw dried lima beans contain roughly 21–23 grams of protein per 100 grams before cooking. Protein digestibility is moderately reduced by naturally occurring trypsin inhibitors, which are significantly deactivated by adequate cooking.

### Can lima beans help with blood sugar control?

Lima beans have theoretical mechanisms for supporting glycemic regulation, including soluble fiber content that slows carbohydrate digestion and protease inhibitors that may partially inhibit alpha-amylase activity, reducing the rate of glucose release. However, no clinical trials in humans have specifically evaluated lima bean consumption as an intervention for blood sugar management or type 2 diabetes. General legume consumption has been associated with improved glycemic indices in epidemiological studies, but direct evidence specific to Phaseolus lunatus remains absent from the published literature.

### What is the bioavailability of protein and minerals from cooked lima beans?

Cooking lima beans significantly reduces antinutrient compounds like phytic acid and trypsin inhibitors, which improves the bioavailability of minerals like iron, zinc, and calcium. The protein digestibility of cooked lima beans is substantially higher than raw beans, making them a more practical protein source for human consumption. Boiling for 15-20 minutes is the standard preparation method that optimizes nutrient accessibility while eliminating compounds that inhibit mineral absorption.

### Are lima beans safe to eat during pregnancy and for young children?

Properly cooked lima beans are generally recognized as safe during pregnancy and for children as part of a balanced diet, providing valuable plant-based protein and folate. However, raw or undercooked lima beans should be strictly avoided during pregnancy due to naturally occurring cyanogenic compounds that are eliminated through thorough cooking. For young children, pureed or mashed cooked lima beans can be introduced as a complementary food, though whole beans should be avoided until the child can chew safely to prevent choking.

### How do lima beans compare to other legumes as a plant-based protein source?

Lima beans contain notably high lysine content (79.7 g/kg protein) compared to grains, making them particularly valuable for combining with rice or wheat to create a complete amino acid profile. Unlike lentils and chickpeas, lima beans have a lower anti-nutrient burden when cooked, based on animal feeding studies, which may result in better overall nutrient utilization. Lima beans provide similar total protein per serving as black beans (~15g per cooked cup) but with a distinct amino acid composition that makes them complementary to different staple grains.

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