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Open research questions in Coffee research and impacts

56 unresolved questions extracted from the limitations and future-work sections of 378 Coffee research and impacts papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Further research is needed to evaluate the performance of the VIS/NIR HSI system on different types of coffee beans. Future studies can explore the potential of deep learning methods for hyperspectral analysis in real-time industrial sorting.

    Application of hyperspectral imaging techniques for sorting coffee beans · 2026 · DOI

  • There is a gap between laboratory demonstrations and real-time deployment of VIS/NIR hyperspectral sorting for green coffee. Conventional RGB-based optical sorters can be limited when contaminants display visual similarities to healthy beans.

    Application of hyperspectral imaging techniques for sorting coffee beans · 2026 · DOI

  • There is a lack of understanding of the relationship between caffeine consumption and migraine. Prior studies have provided conflicting evidence, and the paper seeks to address this gap. The study aims to provide a comprehensive evaluation of the association between caffeine exposure and migraine.

    The impact of caffeine consumption on migraine: a systematic review · 2026 · DOI

  • The underpinnings for cognitive decline are thought to typically develop over decades. The mechanisms by which caffeinated coffee influences cognitive health are unclear.

    Moderate Consumption of Caffeinated Coffee Reduces Risk of Dementia · 2026 · DOI

  • The mechanisms by which caffeinated coffee influences cognitive health are unclear. Previous studies have not differentiated between caffeinated and decaffeinated coffee.

    Moderate Consumption of Caffeinated Coffee Reduces Risk of Dementia · 2026 · DOI

  • Climate change is impacting coffee production systems, leading to reduced yields and increased stress. Breeding for climate change resilience is a challenge due to the lack of breeders' capacity to generate new cultivars quickly. Understanding root anatomy is crucial for developing climate-resilient coffee varieties.

    Anatomy of absorptive roots in fine root system of different coffee species · 2026 · DOI

  • Climate change, - Market durability, - Lack of access to water and modern methods, - Inadequate infrastructure, - Limited access to technical knowledge, - Market uncertainties, - Price fluctuations, - Insufficient institutional support.

    SUSTAINABLE COFFEE FARMING IN KORAPUT: CHALLENGES AND OPPOURTUNITES FOR COFFEE FARMERS" A STUDY IN KORAPUT DISTRICT OF ODISHA · 2026 · DOI

  • The removal of pesticide residues from coffee beans. The need for a scalable and repeatable paradigm to ensure safety of coffee. The impact of zeolite-based rinsing on coffee flavor and aroma chemistry.

    Innovative Coffee Detoxification Method Advancements · 2026 · DOI

  • Drought stress is a major challenge in farming worldwide, exacerbated by climate change and water shortages. Soil degradation and loss of fertility are significant challenges in tropical coffee agroecosystems. There is a need for sustainable soil management practices that can improve soil health and plant productivity while minimizing environmental impacts.

    Long-term soil health and microbiome responses to sustainable management under drought stress in tropical coffee agroecosystems · 2026 · DOI

  • There is a need for long-term studies on the effects of sustainable soil management on soil health in tropical coffee agroecosystems. Prior work has focused on short-term effects, and there is a lack of understanding of the long-term implications of conservation management strategies.

    Long-term soil health and microbiome responses to sustainable management under drought stress in tropical coffee agroecosystems · 2026 · DOI

  • The study does not mention any specific limitations. However, it can be inferred that the study is limited to a specific region (Vietnam's Central Highlands) and crop (Robusta coffee).

    Transpiration dynamics of Robusta coffee in response to irrigation regime, agroforestry system, and dry season severity · 2026 · DOI

  • The study identifies a gap in understanding crop water use in the context of climate change. There is a need to tailor irrigation practices to enhance the resilience of coffee systems. The study aims to address this gap by investigating the transpiration dynamics and productivity of Robusta coffee under different irrigation regimes and agroforestry systems.

    Transpiration dynamics of Robusta coffee in response to irrigation regime, agroforestry system, and dry season severity · 2026 · DOI

  • There is a lack of data on the presence of pharmaceuticals in surface and drinking water of Esmeraldas, Ecuador. Conventional wastewater treatment systems are not optimized for the removal of pharmaceuticals.

    Caffeine is a widespread pollutant in rivers and drinking water of a coastal tropical city (Esmeraldas, Ecuador) · 2026 · DOI

  • The effects of combined decaffeinated green coffee and green tea extracts on hyperglycemia-induced fibroblast activation are unclear. There is a need for novel therapeutic agents for preventing fibrosis and hypertrophy in diabetes mellitus.

    Combined decaffeinated green coffee and green tea extracts prevents fibrosis and hypertrophy in high-glucose-treated fibroblasts · 2026 · DOI

  • longer exposure durations or repeated high-glucose challenges will be necessary to more accurately recapitulate the temporal dynamics of fibrotic remodeling. Moreover, to elucidate the precise molecular mechanisms underlying the antifibrotic effects of GCGTE, particularly its potential involvement in the MMP-9/TGF-β/Smad and/or PI3K/AKT signaling pathways, future in vitro investigations should incorporate pathway-specific inhibitors or genetic approaches, such as gene silencing or knockout models. These strategies would provide stronger evidence for causal relationships between signaling pathway modulation and fibroblast activation. In addition, in vivo studies using diabetic animal models are necessary to validate the translational relevance of the present findings and to assess the efficacy of GCGTE in complex tissue environments. Comprehensive evaluation of pharmacokinetics, optimal dosing regimens, and safety profiles is also required to support further development. Finally, mechanistic studies examining potential interactions between the major bioactive constituents of GCGTE, particularly EGCG and CGA, may provide insight into their combined biological effects and strengthen the therapeutic rationale for GCGTE as a natural antifibrotic intervention in diabetes.

    Combined decaffeinated green coffee and green tea extracts prevents fibrosis and hypertrophy in high-glucose-treated fibroblasts · 2026 · DOI

  • The primary limitation lies in highlighting key limitations of the available evidence base. No study conducted both caffeine and placebo conditions in both menstrual cycle phases. Sub-group analyses are intended to guide hypotheses for future sports nutrition and menstrual cycle research, rather than establish causal interaction effects.

    Caffeine and physical performance in female intermittent sport athletes: a systematic review and meta-analysis considering menstrual cycle phase · 2026 · DOI

  • Female athletes remain underrepresented in caffeine-based performance research. Inconsistent menstrual cycle classification limits generalization of current evidence.

    Caffeine and physical performance in female intermittent sport athletes: a systematic review and meta-analysis considering menstrual cycle phase · 2026 · DOI

  • The study only examined six coffee species. Phenotypic measurements were performed on a limited number of plants. The study did not investigate the functional implications of the observed anatomical traits.

    Anatomy of absorptive roots in fine root system of different coffee species · 2026 · DOI

  • Further studies can be conducted to compare the caffeine levels in coffee from different regions. Further studies can be conducted to analyze the effects of caffeine on human health.

    Extraction and determination of caffeine content in ground coffee commercially available on Bosnian market · 2026 · DOI

  • The lack of comparable studies conducted in Bosnia and Herzegovina on caffeine levels in brewed coffee. The need to determine the level of caffeine in coffee brewed and consumed at home in Bosnia and Herzegovina.

    Extraction and determination of caffeine content in ground coffee commercially available on Bosnian market · 2026 · DOI

  • There is a need to investigate the effects of GCBE on lipid profile and oxidative stress. The study aims to fill the gap in the current literature on the health benefits of GCBE.

    Effects of green coffee bean extract supplementation on lipid profile and oxidative stress in female rabbits · 2026 · DOI

  • Further studies are needed to investigate the mechanisms underlying the associations between coffee and tea consumption and CVD risk. Studies should consider the role of sweetener use in coffee and tea consumption. Research should aim to inform public health guidelines and recommendations for coffee and tea consumption.

    Associations of unsweetened and sweetened coffee and tea consumption with incident cardiovascular disease: a large prospective cohort study · 2026 · DOI

  • The associations of coffee and tea consumption with CVD risk have been inconsistent in previous studies. The role of sweetener use in coffee and tea consumption has not been fully considered in previous studies.

    Associations of unsweetened and sweetened coffee and tea consumption with incident cardiovascular disease: a large prospective cohort study · 2026 · DOI

  • There is a lack of information on the optimal conditions for caffeine extraction from Ilex guayusa. There is a need to evaluate the physicochemical parameters and heavy metal levels of the freeze-dried extract.

    Extracto liofilizado de Ilex guayusa: potencial ingredientepara bebidas energizantes · 2026 · DOI

  • The study identifies a gap in the literature regarding the short-term effects of caffeinated coffee consumption on cardiovascular function and glucose metabolism in healthy young females. Prior studies have shown inconsistent results, and the current study aims to investigate this gap.

    ACUTE EFFECTS OF CAFFEINATED COFFEE ON CARDIOVASCULAR PARAMETERS AND BLOOD GLUCOSE LEVEL IN HEALTHY YOUNG FEMALES · 2026 · DOI

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56 open questions have been extracted from the limitations and future-work passages of 378 Coffee research and impacts papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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