Fava beans: An Ancient Tool to Manage Parkinson’s Disease

Nidhi Ruhela, Vipin Kumar, Shabnam Ain*, Qurratul Ain, Sneha Pandey, Bhuvnesh, Vishakha Tyagi, Ajeet, Babita Kumar

Sanskar College of Pharmacy and Research, Ghaziabad, Uttar Pradesh 201302, India

 *Correspondence: shabnam.ain@sanskar.org; Tel.: +919310807567

DOI: https://doi.org/10.71431/IJRPAS.2025.4502

INTRODUCTION

Parkinson's disease is a neurological condition that worsens with time. Dopamine levels drop significantly, and functional motor impairment follows due to the death of dopaminergic neurons in the substantia nigra pars compacta. Numerous pathogenic pathways, including oxidative stress, have been hypothesized, even though their etiology is still unclear. Patients with Parkinson's disease (PD) now have a much higher quality of life because of the emergence of dopamine replacement medications, which also dramatically reduce symptoms. However, existing therapies that use dopamine replacement drugs have drawbacks because they only address the symptoms of the disease rather than stopping or slowing its progression. [1] There are no objective screening techniques or biomarkers that can be used to diagnose Parkinson's disease. [2]

Although levodopa is still the most effective medication for managing Parkinson's disease symptoms, it has serious side effects, including the "wearing off" effect, levodopa-induced dyskinesias, and other motor problems. [3] Although synthetic levodopa (L-dopa) is still the mainstay of treatment for Parkinson's disease (PD), problems such as side effects, erratic pharmacological efficacy, and the long-term reduction in L-dopa efficacy have spurred researchers to look into new natural sources of L-dopa and other bioactive substances. [4] Additionally, lifestyle modifications, including diet and exercise, can help with secondary Parkinson's symptoms like dementia and confusion. Antioxidant-rich foods may also help reduce oxidative stress in the brain, which may be partially to blame for the cognitive deterioration associated with Parkinson's disease. [5]

PARKINSONS

One percent of people over 60 have Parkinson's disease (PD), a common neurological movement disorder. The progressive loss of dopaminergic neurons and the development of Lewy bodies in the impacted brain regions are hallmarks of Parkinson's disease (PD). Dopaminergic neurons of the substantia nigra (SN), which have axon projections in the striatum, produce dopamine (DA), a brain hormone having the molecular formula C8H11NO2. DA is a neurotransmitter in the brain that is released from the presynaptic membrane into the synaptic cleft, where it attaches to and activates postsynaptic membrane DA receptors. Parkinson's disease (PD) begins when dopaminergic neurons gradually degenerate, lowering the amount of dopamine in the SN and striatum. [9] Parkinson's disease patients also lose the nerve endings that generate norepinephrine, the primary chemical messenger of the sympathetic nervous system, which regulates several bodily processes, including blood pressure and heart rate. Some of the non-movement symptoms of Parkinson's disease, including weariness, erratic blood pressure, impaired food passage through the digestive tract, and a sharp drop in blood pressure when one rises from a sitting or lying posture, may be explained by the loss of norepinephrine.[10]

Although younger people might occasionally be afflicted, the disease often affects older adults. More males than women are impacted. About 5% to 10% of patients with Parkinson's disease suffer the onset of the disease before the age of 50, even though the majority of cases occur after the age of 60. Parkinson's disease with an early onset is frequently, though not always, inherited, and certain types have been connected to particular gene changes. A small number of Parkinson's disease cases can be linked to particular genetic variations, and some cases seem to be inherited. Although Parkinson's disease is believed to be influenced by heredity, the condition typically does not appear to run in families. [11]

Alpha-synuclein is one of several genes that have been related to Parkinson's disease (PD), along with numerous other genes. In occasional cases, environmental chemicals or other causes, such as inflammation, may also change the same genes and proteins that are altered in hereditary diseases.

Researchers have found that PD patients' brains are damaged by oxidative stress. Damage brought on by free radicals, which are chemicals that arise from anomalies in the mitochondria, the parts of the cell that produce energy, is referred to as oxidative stress. PD has also been linked to some gene abnormalities that impact mitochondrial function, according to research.

Genes linked to PD

Multiple genes have been definitively associated with Parkinson's disease (PD):

o   SNCA: This gene encodes the alpha-synuclein protein and was the first to be associated with PD. The discovery that Lewy bodies, present in all PD cases, contain aggregates of abnormal alpha-synuclein highlighted the connection between genetic and sporadic forms of the disease.

o   LRRK2: This gene produces mandarin, a complex protein involved in various cellular functions. Mutations in LRRK2 influence how cells process alpha-synuclein, potentially leading to the formation of Lewy bodies.

o   DJ-1: DJ-1 plays a role in protecting cells from oxidative stress. Mutations in this gene are linked to rare, early-onset forms of PD.

o   PRKN (Parkin): The parkin gene produces a protein involved in breaking down and recycling cellular proteins. Mutations in PRKN are associated with early-onset PD.

o   PINK1: This gene encodes a protein involved in mitochondrial function. Mutations in PINK1 increase vulnerability to cellular stress and are linked to early-onset PD.

o   GBA (Glucocerebrosidase-beta): Mutations in GBA are associated with Gaucher disease, a lipid storage disorder. Specific mutations in this gene increase the risk of developing PD and may accelerate symptom progression.[12]

Environmental Factors: Exposure to agricultural chemicals like pesticides and herbicides, heavy metals, solvents, and detergents [29, 30], as well as Agent Orange during the Vietnam War, has been implicated in PD. However, these exposures are unlikely to be the sole cause of the disease for most individuals. [13]

Symptoms

The symptoms of Parkinson's disease (PD) develop gradually and may initially be barely noticeable. A subtle tremor in the hand, foot, or jaw is often one of the first signs. Tremors are a common symptom of PD. Early on, facial expressions may become limited or absent, arm movements may reduce while walking, and speech may become softer or slurred. These early symptoms are often mild and may go unnoticed. Typically, symptoms begin on one side of the body before spreading to the other, with one side usually being more severely affected. Some symptoms of PD resemble those of other conditions. [14]

Common Symptoms of Parkinson's Disease

Slowed movements (bradykinesia): This is a required symptom for diagnosing PD. Although it might feel like muscle weakness, it is caused by difficulties with muscle control rather than an actual loss of strength.

Resting tremor: Rhythmic shaking occurs in about 80% of PD cases, even when muscles are not actively being used.

Rigidity or stiffness: Stiffness can manifest as "lead-pipe rigidity," a consistent resistance to movement, or "cogwheel stiffness," which combines tremors with rigidity. Impaired posture or gait: As PD progresses, walking may involve short, shuffling steps and reduced arm movement.

Additional Motor Symptoms

Reduced blinking: Caused by diminished control of facial muscles.

Small or cramped handwriting (micrographia): A result of muscle control issues.

Drooling: Due to reduced control of facial muscles.

Mask-like facial expression (hypomimia): Minimal or absent facial expressions.

Difficulty swallowing (dysphagia): Reduced throat muscle control, increasing risks of choking or pneumonia.

Soft or quiet voice (hypophonia): Caused by decreased muscle control in the chest and throat. [15] [16]

Historical Uses of Fava Beans

Fava beans are a spring crop enjoyed worldwide and are thought to have originated in the eastern Mediterranean region, though their exact origin remains uncertain. As one of the oldest cultivated plants, archaeological evidence suggests their domestication dates back over 10,000 years. Before beans from the Americas arrived in Europe after 1492, fava beans were the only edible bean cultivated there. By 1200 CE, they had also become a significant food crop in China. [20]

Today, fava beans are integral to the cuisines of Asia, the Middle East, Europe, South America, and Africa. [21] The plants grow upright on sturdy stalks rather than climbing like many other bean varieties. They thrive in temperate climates worldwide, with China, Ethiopia, Egypt, and France being the largest producers. [20]

Fava beans are notable for containing 0.5% L-DOPA (0.07% in dried form. This compound, first isolated from Vicia fava by Guggenheim in 1913, is a precursor to dopamine, as discovered by Holtz in 1938 through his identification of the enzyme DOPA decarboxylase. [21] Historically, fava beans were used to alleviate symptoms resembling Parkinson's disease, long before their chemical properties were fully understood. Fava beans are distinguished by their high levels of L-DOPA, a compound widely used in synthetic treatments for Parkinson's disease (PD). Historical evidence indicates that ancient civilizations unknowingly utilized fava beans to alleviate symptoms resembling PD. [22]

The plant grows upright, reaching heights of 60 to 150 cm (2 to 5 feet), with minimal branching. Its stems and branches are densely adorned with short-petioled compound leaves. Fava beans form in thick, elongated pods measuring 15 to 25 centimeters in length and 2 to 3 centimeters in width. These bright green pods have a bumpy, leathery, and fibrous surface, sometimes covered with a soft downy layer. While the pods are inedible, they house a cotton-like interior containing 2 to 8 large, flat green beans.

The beans are oval and curved, measuring 5 to 10 millimeters In diameter. Each bean is enclosed in a semi-transparent, waxy white skin that is edible but fibrous and slightly bitter. The beans vary in texture from tender to starchy, depending on their maturity, and develop a soft, buttery consistency when cooked. Their flavor is a blend of sweet, earthy, nutty, and grassy notes, accompanied by a subtle bitterness. [24]

Fava beans thrive in cooler climates and cannot endure hot weather. They are cultivated during the summer in cooler temperate regions and during winter in warmer areas. Unlike many other beans, fava beans can tolerate light frost. [23]

Table 1 Scientific Classification

Pharmacological benefits

Researchers are aware that broad beans, or Vicia faba, have sufficient levels of L-dopa to have pharmacological effects on Parkinson's disease (PD) patients. These beans have been demonstrated to enhance motor performance and raise L-dopa plasma levels. The case of a PD patient who consumed this legume and experienced severe on-time dyskinesias was reported. [25]

 Fava beans includes

o   L-dopa (3–4%): Reduces motor symptoms by being converted to dopamine in the brain.

o   Dopamine agonists: They improve motor performance by activating dopamine receptors.

o   Antioxidants: Preventing oxidative stress [31], a pathophysiological mechanism of Parkinson's disease. [26] Clinical Evidence.

Studies have demonstrated

o   Better motor function: L-dopa supplements or extracts from fava beans helped PD patients with their motor symptoms.

o   Improved cognitive function: Eating fava beans was associated with better cognitive function.

o   Neuroprotective effects: Antioxidants found in fava beans may decrease the progression of illness.

Possible Advantages

o   Natural dietary intervention: Fava beans provide an additional strategy for managing Parkinson's disease.

o   Less reliance on medications: L-dopa from fava beans may reduce the amount of medicine needed.

o   Neuroprotection: Fava beans contain antioxidants that may decrease the progression of illness. [25]

 Levodopa's Natural Source

·         Patients looking for natural, plant-based substitutes for medications favor fava beans. They don't include any artificial excipients or additives.

·         Long-Term Release Levodopa: absorption may be slowed by the fiber in fava beans, resulting in a smoother release and fewer motor oscillations.

Additional Health Advantages

1.      Dietary fiber, which is crucial for digestive health, is abundant in fava beans. Fava beans' dietary fiber supports a healthy digestive system in the following ways:

2.      Motivates Regularity: Dietary fiber promotes regularity by regulating bowel motions and increasing the volume of stool, so preventing constipation.

3.      Enhances Gut Health: Fiber functions as prebiotic, feeding good gut bacteria.

4.      Prevents Diverticulosis: One sign of diverticulosis is the formation of small pouches called diverticula in the colon. A high-fiber diet that contains fava beans can help prevent diverticulosis because it lowers colonic pressure and promotes regular bowel movements.

5.      Controls Blood Sugar Levels: Fava beans' high soluble fiber content slows down the bloodstream's absorption of sugar, assisting in the maintenance of stable blood sugar levels. This may help people who have diabetes or are at risk of developing the condition.

6.      Decreases Blood Cholesterol: Fava beans' soluble fiber binds to cholesterol in the digestive tract, preventing it from entering the bloodstream. This helps reduce LDL cholesterol, or the "bad" lipids, and lowers the risk of cardiovascular disease. [27]

7.      May Help Prevent Birth Defects: Fava beans are rich in folate, a nutrient that supports good fetal development, which may help prevent birth defects. Folate is essential for the development of organs and cells. To lower the chance of neural tube abnormalities, or problems with the development of her unborn child's brain and spinal cord, an expectant mother needs to consume more folate from food and supplements.

8.      Include Immune-Boosting Nutrients: Eating fava beans regularly may strengthen your immune system.

9.      Good for Bone Health: Fava beans are high in copper and manganese; two minerals that may help stop bone loss. [28]

The nutritional qualities of Vicia faba L. V. faba is a great source of complex carbohydrates, proteins, and dietary fiber, and it has relatively little saturated fat. The combination with cereals can satisfy dietetic requirements since lysine is available in large amounts while methionine and cysteine are present in low concentrations. However, the variety of seeds affects their makeup. Phenolic chemicals are among the secondary metabolites found in Fava beans. It is believed that these modest antioxidant elements contribute to the prevention of Illness. [29]

Apart from its nutritional value, the Fava bean is abundant in bioactive compounds known for their health-enhancing properties. These consist of resistant starch, dietary fibers, phenolic chemicals, GABA, non-protein amino acids, and, most importantly, bioactive peptides. The fava bean holds great promise for the creation of novel nutraceuticals and biofunctional food ingredients because of its abundance of health-promoting components. [21]

 L-3,4-dihydroxyphenylalanine, or L-dopa, the same substance found in synthetic levodopa formulations, is also abundant in fava beans. Depending on the type and preparation, a 100g portion of fava beans may contain 50–100 mg of levodopa. Apart from levodopa, fava beans offer vital nutrients like:

Protein (26–30%)-: Compared to peas and most pulses, fava beans have a higher protein level. Between seeds that are immature and mature. Essential amino acids (isoleucine, leucine, lysine, methionine, tyrosine, phenylalanine, valine, histidine, tryptophan, and threonine) and non-essential amino acids (aspartic acid, glutamic acid, alanine, arginine, glycine, proline, and serine) are included in the fava beans amino acid profile.

Sugars, dietary fiber, and starch are examples of carbohydrates-:

Fava bean seeds include between 51% and 68% carbohydrates, while starch makes up the majority. Both soluble and insoluble dietary fiber can be found in abundance in fava beans. FBF has the highest dietary fiber level when compared to lima, pinto flours, and red kidnealkaloids. [22]

Table 2  Percentage of Sugar, dietary fiber and starch

Minerals and vitamins

Fava beans are a rich source of various minerals, including sodium, potassium, calcium, copper, zinc, iron, manganese, magnesium, phosphorus, and sulfur. The mature seeds of fava beans are particularly high in potassium (1,062 mg/100 g) and low in sodium (13 mg/100 g), making them suitable for individuals with hypertension or those on a low-sodium diet. In contrast, immature Fava bean seeds provide 50 mg of sodium and 250 mg of potassium per 100 g (USDA, 2021). Additionally, fava beans are an excellent source of folate, an essential cofactor in the synthesis of pyrimidines, purines, and amino acids. [22]

Alkaloids

Alkaloids are substances that contain nitrogen and frequently have pharmacological effects. Numerous alkaloids, such as dopamine derivatives and other related substances, are found in fava beans. Certain alkaloids are known to interact with the dopaminergic system, either altering dopamine receptors or amplifying the effects of dopamine. Therefore, Alkaloids could potentially aid in the treatment of Parkinson's disease (PD). Either as substances that directly affects dopamine activity in the brain or as supplements to L-dopa.

Flavonoids

Strong antioxidants with neuroprotective qualities are flavonoids, a family of polyphenolic chemicals. Flavonoids like catechins, kaempferol, and quercetin are found in fava beans. These substances are believed to reduce oxidative stress, a major contributor to the neurodegenerative processes observed in Parkinson's disease, by scavenging free radicals. Additionally, flavonoids may have anti-inflammatory properties that could aid in lowering neuroinflammation, a defining feature of Parkinson's disease pathology.

Saponins

Glycoside substances called saponins have antibacterial and anti-inflammatory properties. It has been proven that some saponins shield neurons from oxidative damage and encourage dopaminergic neuron regeneration. Given that dopaminergic neuron deterioration is a major concern in Parkinson's disease (PD), the possible neuroprotective function of fava beans' saponins may be pertinent.

Phenolic Acids

Numerous phenolic acids, such as ferulic and caffeic acid are also present in fava beans. It has been verified that these substances have neuroprotective, anti-inflammatory, and antioxidant properties. Given the significance of neuroinflammation and oxidative stress in Parkinson's disease, phenolic acids may be essential for preventing neuronal damage and promoting the general well-being of dopaminergic neurons. [24]                                       

Amino acid

Proteins are made up of amino acids, some of which like tyrosine and glutamine—are crucial for the synthesis of neurotransmitters. Fava beans are a desirable food source for managing Parkinson's disease because amino acids like L-dopa, a precursor to dopamine, may directly improve dopamine availability in the brain. [25]

Potential Risks and Limitations

Possible Dangers and Restrictions although fava beans are a natural source of L-dopa, using them to treat Parkinson's disease raise several questions. The onset of a disease called favism is one of the main dangers connected to eating fava beans. A hereditary condition known as favism affects people who lack the enzyme glucose-6-phosphate dehydrogenase (G6PD). Fava bean consumption in these people can result in hemolytic anemia, a potentially fatal illness. Furthermore, fava beans' L-dopa content is not as consistent or strong as that of pharmaceutical preparations. For patients and physicians looking for consistent therapeutic outcomes, this unpredictability presents a difficulty. Furthermore, eating a lot of fava beans can make patients more susceptible to adverse effects like nausea, light-headedness, or gastrointestinal distress. An additional drawback is that synthetic and fava bean L-dopa may have different pharmacokinetics, which could affect when and how long symptoms are relieved. Because of this, it could be challenging for medical professionals to include fava beans in established treatment patients. [28]

FUTURE DIRECTION

The application of fava beans in managing Parkinson’s disease is an area of growing interest. To fully realize the potential of fava beans as a therapeutic option, more research is needed to address several key questions:

• Standardization of Dosage: Additional studies are required to evaluate the optimal dosage and preparation methods for fava beans to ensure consistent and effective therapeutic outcomes.

• Long-term Efficacy and Safety: Long-term clinical trials are essential to assess the safety and therapeutic value of fava beans in PD patients, especially in comparison to synthetic L-dopa therapies.

• Genetic and Environmental Factors: Research should explore how genetic factors (such as G6PD deficiency) and environmental conditions affect the safety and efficacy of fava beans in treating PD.

• Synergistic Effects: Studies should investigate the potential synergistic effects of fava beans when used in combination with other PD treatments, including dopamine agonists and MAO-B inhibitors.

CONCLUSION

Fava beans offer a promising natural remedy for managing Parkinson's disease due to their high L-DOPA content. Fava beans may help alleviate motor symptoms in PD patients. While they present several advantages over synthetic levodopa, challenges such as variability in L-DOPA content and the risk of favism must be addressed. With further research and clinical validation, While they offer potential benefits like sustained levodopa release and additional health advantages, fava beans could become a valuable component of holistic Parkinson's disease management.

CONFLICT OF INTEREST           None

ACKNOWLEDGEMENT

I sincerely thank Sanskar College of Pharmacy and Research for their constant support and encouragement. I am grateful to my faculty and mentors for their valuable guidance, which has been instrumental in shaping this work.

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