Food-Waste-Derived Lutein as a Sustainable Bioactive for Preventive Nutrition

Introduction

Lutein, a yellow-to-orange xanthophyll carotenoid, is sourced from plants such as fresh leafy greens (cabbage, spinach, kale, broccoli, peas, corn), as well as egg yolks. Humans cannot synthesize lutein; therefore, dietary intake is essential. The recommended intake is approximately 10 mg/day, whereas typical adult consumption ranges from 1-2 mg/day. Proven to enhance eyesight, skin health, cardiac functions, and gut integrity, lutein scavenges free radicals to combat oxidative stress. It binds to StARD3 protein for macular accumulation in the retina, preventing eye diseases; and as secondary therapy, it reduces age-related macular degeneration and cataracts.¹

Rising agricultural and food production to feed a growing global population generates extensive food waste, posing environmental threats to humans and wildlife. Valorizing these wastes into invaluable food additives like lutein aligns with circular economy principles for sustainability. These natural pigments offer therapeutic potential, enabling greener functional foods that outperform synthetic petroleum-based dyes.²

This narrative review synthesizes evidence from published studies on food-waste-derived lutein, focusing on sustainable extraction strategies, bioactivity, and preventive nutrition applications. It aims to consolidate current knowledge on food-waste-derived lutein by summarizing its core pigment characteristics, sustainable extraction from food waste streams and processing by-products, and its bioactivity in health management applications. It highlights the role of novel formulations and value-added applications in enhancing lutein’s functional potential, positioning waste-derived lutein as an eco-friendly ingredient for functional foods and in preventive nutrition. Unlike existing reviews that focus mainly on dietary or algal lutein, this communication uniquely emphasizes food waste sources and extraction strategies within a circular economy framework, while also underscoring their industrial scalability. Furthermore, the therapeutic use of lutein requires rigorous regulatory evaluation, including safety, bioavailability, and efficacy assessments, to meet approval standards set by authorities such as the FAO, FDA and ESFA, has also been discussed.

Attributes of the bio-pigment Lutein

The term lutein comes from the Latin word ‘Luteus,’ which means yellow and rightfully represents this dark yellowish xanthophyll pigment, which is among the 600 known naturally occurring carotenoids. This is mostly synthesized from natural green to yellow raw fruit or vegetable sources and some animal sources, and it can serve as a modulator in the non-photochemical quenching of triplet chlorophyll, which increases during the photosynthetic process.³ The water-insoluble lipophilic dicyclic molecule lutein contains long polyene chains of conjugated double bonds (Figure 1a) with light absorption capacity and is vulnerable to light, heat, and the presence of acids. The geometric cis and trans isomeric forms of lutein are shown in (Figure 1b), where the natural stereoisomer is (3R, 3′R, 6′R)-beta, epsilon–carotene-3, 3′-diol. The closest isomeric form of lutein is zeaxanthin, which can be interconverted by changing the placement of a double bond through the intermediate component, meso-zeaxanthin.⁴

Figure 1: (a) The basic structure of lutein showing polyene chain and conjugated double bonds (b) The geometric isomers of lutein Click here to view Figure

Lutein has antioxidant, anti-inflammatory, and other therapeutic and health benefits that can be introduced into the body from outside. Lutein is highly beneficial for general eye health or age-induced macular degradation, cardiac health, improving cognitive function, and reducing carcinogenic effects on the body.⁵

Further studies sheds light on the basic characteristics of lutein and its various sources, specifically of food waste origin. It also discusses the significance of lutein in the management of health issues in various forms.

Lutein from food waste: Sources and Extraction

Lutein can easily be sourced from various natural substances, as discussed previously. The recovery of lutein from food waste represents an important technological advancement. It enables waste reutilization while simultaneously reducing environmental pollution and supporting ecological sustainability. The process of lutein synthesis from food waste can occur mainly through fermentative production of biomass from different microorganisms followed by a solvent-based extraction process. In addition, supercritical fluid extraction using carbon dioxide, direct solvent extraction, solvent extraction using a Soxhlet apparatus, enzyme- or ultrasound-assisted extraction, or simple mechanical extraction can be performed using various food waste sources. The currently reported and available sources of lutein obtained by reusing food-processing wastes or by-products are listed in Table 1.

Table 1: Lutein valorization from different types of food processing wastes and by products

Although a wide range of extraction methods has been reported for recovering lutein from food waste, their suitability for industrial translation varies considerably. Conventional solvent extraction remains attractive due to its low capital cost and operational simplicity; however, it suffers from high solvent consumption, extended extraction times, and challenges in solvent recovery and regulatory compliance, particularly when toxic organic solvents are used. These limitations restrict scalability and increase downstream purification costs, reducing overall process sustainability.^2,11

Green and assisted extraction technologies, including supercritical CO₂, ultrasound-assisted, and enzyme-assisted extraction, offer distinct advantages in terms of scalability, reduced solvent residues, and environmental footprint. Supercritical CO₂ extraction, especially when combined with ethanol as a co-solvent, enables high-purity lutein recovery with efficient solvent recycling and minimal thermal degradation, making it attractive for nutraceutical applications. However, its industrial adoption is constrained by high capital investment and energy requirements, which may limit cost-effectiveness for small and medium-scale processors.^8,13 In contrast, ultrasound and enzyme-assisted techniques are more adaptable to decentralize waste valorization systems, offering moderate energy demand, improved mass transfer, and shorter extraction times, although enzyme costs and process optimization remain a challenge.^15,21

A critical yet underexplored challenge across all extraction strategies is the variability in food waste composition, which directly influences extraction efficiency and reproducibility. Differences in raw material maturity, seasonal availability, processing history, and moisture content can result in fluctuating lutein yields and impurity profiles. Such heterogeneity complicates process standardization and scale-up, particularly for solvent-based methods that are sensitive to matrix effects. Integrated bioconversion approaches using microalgae grown on food waste hydrolysates partially mitigate this issue by converting heterogeneous substrates into more uniform biomass; however, they introduce additional operational complexity and time requirements.^18,19

From an environmental perspective, solvent recovery, energy input, and waste generation are decisive factors in determining process sustainability. Supercritical CO₂ systems offer near-complete solvent recyclability and minimal secondary waste, aligning well with circular economy principles, whereas conventional solvent extraction generates higher solvent loses and environmental burdens if recovery systems are inefficient. Life-cycle and techno-economic assessments consistently highlight that combining green extraction technologies with effective solvent recovery and waste minimization strategies is essential for achieving both environmental and economic viability in large-scale lutein production from food waste.^2,6

Significance of lutein in health and bioavailability

The health effects of lutein can be broadly categorized into clinically supported benefits and emerging or preclinical evidence. While strong human data support lutein’s role in eye health and systemic antioxidant activity, several other reported benefits are primarily derived from in vitro experiments, animal models, or limited observational studies. These emerging findings should therefore be interpreted cautiously and not equated with established clinical outcomes.^3,27

Lutein exhibits low bioavailability due to its poor water solubility and susceptibility towards oxidative degradation. Its intestinal absorption is limited by inefficient micelle formation and interaction with bile acids, digestive enzymes, and other physiological factors. Being heat and light sensitive, lutein content is often reduced during cooking or processing.²⁸ As a fat-soluble compound, its absorption is enhanced in lipid-rich food matrices.²⁹ Commercially lutein is available in diverse formulations-including pure tablets, capsules, syrup, concentrates, dehydrated powders with bioactives, vitamin blends, topical creams, intravenous solutions, nano-encapsulated carriers, and antioxidant sprays- for both nutraceutical and pharmaceutical applications. The key therapeutic domains in which lutein serves as a critical bioactive agent are outlined below:

Major domains

Clinically supported effects

Eye and cognitive health

Age-related macular degeneration (AMD) and other ocular defects stem from oxidative stress and chronic blue light exposure. Lutein supplementation counteracts these by quenching singlet oxygen, neutralizing zeaxanthin radicals, supressing pro-inflammatory cytokines, upregulating superoxide dismutase (SOD) activity, attenuating lipid peroxidation, and promoting retinal epithelial (RPE) cell repair and homeostasis.²⁸   It also demonstrates efficacy in cataract prevention and symptom alleviation.

In maternal nutrition, lutein fosters fetal eye, brain, and neural development, enhances cognitive outcomes, and correlates with reduced preeclampsia risk via elevated plasma levels; higher cord blood carotenoids further bolster maternal-prenatal health and long term child neurodevelopement.³⁰ Neuroprotectively, lutein safeguards docosahexaenoic acid (DHA) in key brain regions, augments memory consolidation and attentional processing, readily traverses the blood-brain barrier, and attenuates amyloid-β-induced memory deficits in Alzheimer’s disease models.³¹

Cardio-metabolic and oxidative stress

Lutein exerts cardio-protective effects by modulating Peroxisome Proliferator-activated receptor-α (PPAR-α) signalling, attenuating amyloid plaque deposition, supressing pro-inflammatory cytokines, such as Tumour Necrosis Factor-α (TNF-α), Interleukin 6 (IL-6), and acute-phase markers, such as C-Reactive proteins, and preventing cardiac arrhythmias, myocardial infarction, and acute coronary syndromes.⁵ It optimizes lipid homeostasis by enhancing cholesterol efflux, reducing LDL (Low-Density Lipoprotein) oxidation, and lowering triglyceride levels, yielding long term protection against lipid peroxidation, endothelial dysfunction and atherosclerosis.³² As a multifaceted agent, lutein functions as a potent antioxidant, anti-apoptotic modulator, and anti-inflammatory mediator, mitigating oxidative DNA damage and restoring homeostasis.³³ By scavenging reactive oxygen species (ROS) and downregulating Nuclear Factor κB (NF-κB) pathways, it alleviates systemic oxidative stress-underpinning its therapeutic roles in tissue repair, vascular integrity and chronic disease amelioration.²⁷

Robust clinical and epidemiological evidence supports lutein’s role in eye health, particularly in reducing the risk and progression of age-related macular degeneration and cataract, through antioxidant, anti-inflammatory, and blue-light filtering mechanisms.^1,5,30

Emerging and preclinical evidence

Evidence for lutein’s role in cancer, liver, lung, and bone health is largely derived from cell culture studies, animal models, and observational analyses, with limited confirmation from controlled human trials. Preclinical studies suggest that lutein may modulate oxidative stress, inflammatory signalling, and cell proliferation pathways; however, these findings remain exploratory and require clinical validation.

Cancer

Inhibits vascular growth in endothelium, reduces risk of cancers, and decreases incidence of non-Hodgkin lymphoma.⁵ Preclinical studies indicate that lutein may inhibit angiogenesis and cancer cell proliferation through antioxidant and anti-inflammatory mechanisms; however, current evidence is largely limited to in-vitro and animal models, with insufficient clinical data to support therapeutic claims in humans.^3,27

Skin condition

Enhances brightness, texture, elasticity and protects from UV damage.³⁴

Liver disease

Enhances hepatic signalling via sirtuin-1 and PPAR-α, protects against hepatotoxicity, and reduces risk of non-alcoholic fatty liver disease.³⁵

Lung disease

Improves lung capacity and expiratory volume; trials show limited benefit in asthma and bronchopulmonary dysplasia. Observational and experimental studies suggest a potential association between lutein intakes and improved respiratory outcomes, but clinical trials report inconsistent or modest effects, indicating that evidence for lung health benefits remains inconclusive.³⁶

Bone associated problems

Lutein regulates the activity of NF-κB, thus helping with bone formation and inhibition of bone reabsorption, decreasing interleukin-1-dependent differentiation of osteoclasts.³⁷ Studies have shown its effectiveness in increasing hip bone mineral density in men, contributing to overall bone health development.³⁸ Experimental studies demonstrate that lutein may influence bone metabolism by regulating NF-κB signalling and osteoclast activity; however, human evidence is currently limited to cross-sectional associations, warranting further longitudinal and interventional studies.^37,38

Regulatory status of lutein

Lutein is a well-characterized xanthophyll carotenoid with established approvals for use in foods, dietary supplements, and pharmaceuticals. Regulatory authorities such as the ESFA, JECFA and the FDA have evaluated its safety and defined acceptable intake levels for human consumption. However, when lutein is derived from food waste or processing by-products, additional regulatory considerations arise that extend beyond those applied to conventionally sourced lutein.

Regulatory classification of food-waste-derived lutein

Although lutein itself is an approved bioactive, its derivation from food waste introduces regulatory complexity. In many jurisdictions, waste-derived bioactives are not automatically covered under existing lutein authorizations and may instead be regulated as ‘novel foods’, ‘new dietary ingredients’, or ‘recycled food ingredients’, depending on the origin of the waste material and the processing pathway employed. Regulatory agencies such as ESFA and the FDA typically require clear evidence that waste-derived lutein is compositionally equivalent to lutein obtained from traditional sources, produced under food-grade conditions, and compliant enhanced documentation of traceability, source segregation, and process control to ensure regulatory acceptance and consumer safety.^39,40

Safety, toxicological evaluation and contaminant risks

While lutein has a well-established safety profile, food-waste-derived lutein requires additional toxicological scrutiny due to the potential presence of contaminants. Food waste streams may carry pesticide residues, heavy metals, mycotoxins, process-related contaminants, or microbial hazards, depending on their origin and handling. As a result, regulatory approval commonly demands comprehensive safety assessment, including chemical characterization, impurity and contaminant profiling, stability testing, and toxicological evaluation using in-vitro and in-vivo models. Demonstration of batch-to-batch consistency and compliance with acceptable daily intakes values, established at 1 mg/kg body weight by ESFA and 2 mg/kg body weight by JECFA, is essential to support safety claims and regulatory approval.^41,39

Regulatory approval and commercialization barriers

Despite strong scientific and sustainability rationales, several challenges hinder the commercialization of food-waste-derived lutein. Regulatory approval processes are often time-intensive and costly, particularly when novel food dossiers or new dietary ingredient notifications are required. Variability in waste composition across seasons and regions complicates standardization and large-scale production, while differences among International regulatory frameworks create barriers to global market entry. In addition, consumer perception of ‘waste-derived ‘ingredients may necessitate transparent labelling, Effective communication, and regulatory harmonization to build trust. Addressing these barriers through standardized processing protocols, robust safety datasets, and clearly defined regulatory pathways will be critical for the successful integration of food-waste-derived lutein into nutraceutical and functional food markets.⁴²

Limitations and research gaps in food-waste-derived lutein valorization

Despite notable progress, several challenges limit the large-scale utilization of food-waste-derived lutein. Extraction yields vary due to heterogeneity in waste composition, seasonal availability, and prior processing, while lutein’s sensitivity to heat, light and oxygen leads to degradation during extraction, processing, and storage. Its poor aqueous solubility and limited intestinal absorption further restrict bioavailability, even when recovery yields are high. Although encapsulation and lipid-based delivery systems improve stability and uptake, their industrial scalability and cost-effectiveness remain insufficiently validated. In addition, waste-derived lutein faces increased regulatory scrutiny because food waste streams may contain pesticide residues, heavy metals, or microbial contaminants, requiring rigorous purification, toxicological evaluation, and batch-to-batch consistency testing. Such products are often regulated as novel foods or new dietary ingredients, increasing approval timelines and costs. Finally, the predominance of in-vitro and animal studies, coupled with limited human clinical trials, restricts robust assessment of bioavailability, dose-response relationships, and long-term safety, while the scarcity of life cycle and techno-economic analyses constrains evaluation of environmental and industrial feasibility compared with conventional lutein sources.^2,27

Discussion

The primary goal of this review was to critically evaluate food-waste-derived lutein as a sustainable bioactive ingredient for preventive nutrition, integrating evidences on its sources, extraction strategies, biological functions, and formulation challenges within a circular economy framework. This current discussion highlights that valorization of food processing residues and agro-industrial waste is not merely an environmental remediation strategy but a scientifically and economically viable route for producing high-value nutraceuticals such as lutein.

Food Waste as a strategic lutein reservoir

A central insight emerging from this work is the diversity and abundance of lutein-rich food waste streams, including fruit and vegetable peels, pomace, processing wastewater, and expired food products. Unlike conventional lutein sources, which rely heavily on fresh marigold flowers or refined algal biomass, food waste offers a decentralized, low-cost, and renewable feedstock. The studies complied demonstrate that both plant-derived wastes (e.g., carrot, spinach, pumpkin, tomato peels) and secondary waste streams used to cultivate microalgae can yield appreciable lutein concentrations when appropriate extraction or bioconversion strategies are applied. Importantly, the feasibility of lutein recovery from waste depends not only on pigment content but also on process efficiency, solvent safety, energy consumption, and scalability. Advanced green technologies- such as supercritical CO₂ extraction, ultrasound-assisted extraction, and enzyme-assisted processes-consistently outperform conventional solvent extraction in terms of yield, selectivity, and environmental compatibility. These approaches align well with sustainable processing goals and reduce reliance on toxic organic solvents, thereby improving regulatory acceptability for food and nutraceutical applications.

Functional relevance to preventive nutrition

The discussion of health benefits reinforces lutein’s position as a cornerstone carotenoid in preventive nutrition rather than a niche ophthalmic supplement. Beyond its established role in age-related macular degeneration, lutein demonstrates systemic antioxidant and anti-inflammatory activities that are relevant to cardiovascular health, neuroprotection, metabolic regulation, and chronic disease prevention. This broad physiological relevance strengthens the argument for incorporating lutein into functional foods and dietary supplements targeted at diverse population groups, including the elderly, pregnant women, and individuals at risk of oxidative stress-related disorders. From a preventive nutrition perspective, food-waste-derived lutein is particularly attractive because it supports the development of functional foods that address micronutrient insufficiency while simultaneously reducing environmental burden. This study highlights that habitual dietary intake of lutein remains substantially below recommended levels in many populations. Integrating lutein into commonly consumed food matrices such as bakery products, beverages, dairy alternatives, and edible oils could help bridge this gap without necessitating high-dose supplementation.

Bioavailability as a limiting factor

Despite its promising health profile, lutein’s low bioavailability remains a major bottleneck to its effective utilization. Poor aqueous solubility, sensitivity to heat, light, and oxygen, and limited intestinal absorption restricts its biological efficacy, particularly when delivered through conventional food matrices. Here it has been shown that extraction yield alone is not a sufficient indicator of functional success; bioaccessibility and stability must be addressed concurrently. Emerging delivery systems including nano- and microencapsulation, lipid-based carriers, nanoemulsions, and protein-polysaccharide complexes represent a critical translational bridge between food waste valorization and clinical efficacy. These systems not only protect lutein during processing and storage but also enhance micellarization and intestinal uptake. Future work should prioritize comparative studies that link waste-derived lutein formulations with in-vivo bioavailability and functional biomarkers, enabling evidence-based product development.

Regulatory and safety considerations

Another important dimension discussed is regulatory compliance. While lutein is widely regarded as safe and has established acceptable daily intake limits, waste-derived lutein introduces additional scrutiny related to source variability, contaminants, and batch-to-batch consistency. Comprehensive characterization, toxicological evaluation, and adherence to food-grade processing standards are essential for regulatory approval by agencies such as EFSA, JECFA, and the FDA. This discussion also highlighted that the regulatory pathway for waste-derived bioactives may be facilitated by transparent sourcing, traceability, and the adoption of standardized extraction protocols. Harmonization of safety assessment frameworks will be critical for global commercialization, particularly as food waste streams differ significantly across regions.

Future prospects and research directions

Looking forward, the integration of food-waste-derived lutein into preventive nutrition strategies presents several promising research and industrial avenues. First, techno-economic and life-cycle assessments should be conducted to quantify the environmental and economic benefits of waste-based lutein production relative to conventional sources. Such analyses are crucial for attracting industrial investment and policy support. Second, interdisciplinary research linking food science, nutrition, and clinical studies is needed to establish dose-response relationships and long-term health outcomes associated with waste-derived lutein consumption. This is particularly relevant for emerging applications in cognitive health, metabolic disorders, and maternal nutrition, where mechanistic evidence is still lacking as omega-3 fatty acids, polyphenols, or dietary fibres could amplify health benefits while improving market appeal. Food waste streams themselves may provide complementary bioactive compounds, enabling the creation of holistic, waste-derived nutraceutical blends. Finally, policy-driven incentives and industry-academia collaborations will be instrumental in scaling laboratory successes to commercial reality. Embedding lutein recovery within existing food processing infrastructures, such as juice, starch, or fermentation industries, could significantly lower production costs and enhance adoption.

Although this review draws upon a broad and diverse body of literature to minimize selection bias, certain limitations should be acknowledged. Potential sources of bias include publication bias favouring studies with positive outcomes, heterogeneity in extraction methods, waste matrices, and analytical protocols, as well as the predominance of preclinical and in-vitro evidence over human clinical data. Additionally, variations in regulatory frameworks and reporting standards across studies may influence data comparability. These factors may affect the generalizability of findings; therefore, conclusions should be interpreted within the context of these limitations. Explicit recognition of such biases strengthens transparency and supports balanced interpretation of food-waste-derived lutein’s functional and therapeutic potential.

To address the limitations more systematically in a nutshell, future research should focus on several key areas. First, standardization of extraction methodologies, analytical quantification, and reporting units is required to reduce heterogeneity across food-waste-derived lutein studies and enable meaningful cross-comparison. Second, the predominance of in-vitro and preclinical evidence highlights the need for well-designed human clinical trials evaluating bioavailability, dose-response relationships, and long-term safety of waste-derived lutein formulations. Third, variability in food waste composition and the potential presence of contaminants necessitate rigorous source characterization, toxicological evaluation, and batch-to-batch consistency testing to meet regulatory requirements. Finally, integrated techno-economic and life-cycle assessments are needed to determine industrial scalability and environmental advantages over conventional lutein sources. Collectively, addressing these aspects will strengthen the translational relevance of food-waste-derived lutein for preventive nutrition and functional food applications.

Conclusion

Lutein is a potent antioxidant and therapeutic carotenoid with well-established roles in preventive nutrition and human health. Its regular intake through a balanced diet is particularly important for vulnerable populations, including the elderly, pregnant women, and individuals with chronic health conditions. In cases of impaired absorption, dietary supplementation may be required; however, available evidence indicates lower incidences of reported acute or chronic toxicity. To ensure consumer safety, the acceptable daily intake of lutein has been established at 1 mg/kg body weight by the European Food Safety Authority (EFSA) and 2 mg/kg body weight by the Joint Expert Committee on Food Additives (JECFA).

Food waste, often regarded as an environmental burden, represents a valuable and sustainable reservoir of lutein that can be efficiently recovered through low-cost extraction processes. Valorization of such waste streams not only mitigates environmental pollution but also enables the development of value-added industries focused on nutraceutical and functional food production, thereby supporting circular economy principles.

Despite its promise, large scale recovery of lutein from food waste faces challenges related to extraction efficiency, stability, bioavailability, regulatory approval, and cost effectiveness. Addressing these limitations through process optimization, advanced formulation strategies, and regulatory alignment will be essential for successful industrial translation of laboratory-scale valorization into commercially viable nutraceutical applications.

Acknowledgement

The author thanks Department of Food Technology, Haldia Institute of Technology for providing the infrastructural support

Funding Sources

The author(s) received no financial support for the research, authorship, and/or publication of this article.

Conflict of Interest

The authors do not have any conflict of interest.

Data Availability Statement

This statement does not apply to this article.

Ethics Statement

This research did not involve human participants, animal subjects, or any material that requires ethical approval

Informed Consent Statement

This study did not involve human participants, and therefore, informed consent was not required.

Clinical Trial Registration

This research does not involve any clinical trials

Permission to Reproduce Materials from Other Sources.

Not Applicable

Author Contributions

The sole author was responsible for the conceptualization, methodology, data collection, analysis, writing, and final approval of the manuscript

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Abbreviations List:

FAO: Food and Agriculture Organization

FDA: Food and Drug Administration

StARD3: StAR-related lipid transfers domain-3

Sc-CO_2: Supercritical CO₂

AMD: Age-related macular degeneration

SOD: Superoxide Dismutase

RPE: Retinal Epithelial

DHA: Docosahexaenoic Acid

TNF-α: Tumour Necrosis Factor α

IL-6: Interleukin 6

LDL: Low-Density Lipoprotein

ROS: Reactive oxygen species

NF-κB: Nuclear Factor κB

UV: Ultraviolet

PPAR-α: Peroxisome proliferator-activated receptor alpha

EFSA: European Food Safety Authority

JECFA: Joint Expert Committee on Food Additives