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Open research questions in Nutrition and Health in Aging

350 unresolved questions extracted from the limitations and future-work sections of 1,162 Nutrition and Health in Aging papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Missing data in older-adult cohorts. Selection bias in complete-case analysis. Need for multiple imputation to reduce bias and improve the robustness of the findings. Challenges in establishing a valid experimental model of aged diabetic rats.

    Vitamin D status and sarcopenia in older adults: population-based evidence for synergy with diabetes and experimental validation in an aged diabetic rat model · 2026 · DOI

  • The association between vitamin D status and sarcopenia, and the potential modifying effect of diabetes, are unclear. Limited understanding of the underlying mechanisms of sarcopenia and the role of vitamin D. Need for experimental validation of the findings.

    Vitamin D status and sarcopenia in older adults: population-based evidence for synergy with diabetes and experimental validation in an aged diabetic rat model · 2026 · DOI

  • Further research is needed to understand the role of NI in shaping symptom pathways during chemotherapy, - Studies should investigate the relationship between NI and inflammatory biomarkers, - Research should explore the impact of NI on treatment outcomes and survival

    Symptom-Heavy Nutritional Insecurity in Older Adults Initiating Chemotherapy · 2026 · DOI

  • The study was limited to patients with unexpected weight loss, - The study only included patients aged 18 years and above, - The study only included patients with at least 12 months of registration with their practice, - The study excluded patients with a history of cancer prior to UWL

    Blood test trend versus single threshold abnormality to discriminate cancer from non-cancer in patients with unexpected weight loss: A retrospective cohort study · 2026 · DOI

  • The current evidence base for using non-specific blood tests to risk stratify for cancer in primary care is almost entirely limited to unadjusted blood test abnormalities of single tests. There is a need to assess the discrimination of blood test trends for undiagnosed cancer.

    Blood test trend versus single threshold abnormality to discriminate cancer from non-cancer in patients with unexpected weight loss: A retrospective cohort study · 2026 · DOI

  • Retrospective study, - Limited by availability of data, - ECOG performance status was recorded for only 0.5% of patients

    Timing matters: gastrostomy placement and outcomes in patients with head and neck cancer undergoing chemoradiotherapy · 2026 · DOI

  • Investigate causal effects of gastrostomy timing, - Examine outcomes in different patient subgroups, - Develop predictive models for gastrostomy placement

    Timing matters: gastrostomy placement and outcomes in patients with head and neck cancer undergoing chemoradiotherapy · 2026 · DOI

  • Gaps in coverage for medical nutrition therapy across diagnoses and care settings. Limited availability of dietitian-led care and clinically indicated nutrition products. Discontinuity across care transitions and lack of integration with food and financial assistance.

    Health insurance coverage for medical nutrition therapy in older women with cancer: a comparative health policy perspective on long-term care, frailty, and survivorship equity · 2026 · DOI

  • The lack of consensus definitions and measurements of sarcopenia in dementia caregivers. The heterogeneity of the available evidence, including different study designs and populations. The limited number of studies examining the relationship between dementia caregiving and sarcopenia.

    Sarcopenia in Informal Caregivers of Persons Living with Dementia: A Scoping Review · 2026 · DOI

  • Investigate the relationship between dementia caregiving and sarcopenia using longitudinal designs, - Examine the effects of interventions on sarcopenia in informal dementia caregivers, - Explore the mechanisms by which chronic psychological stress contributes to sarcopenia in this population

    Sarcopenia in Informal Caregivers of Persons Living with Dementia: A Scoping Review · 2026 · DOI

  • The study faced challenges in terms of the complexity of dysphagia, which requires good coordination among multiple tissues and organs. The study also faced challenges in terms of the limited understanding of the prognostic value of PNI in older Japanese patients with dysphagia.

    Prognostic nutritional index negative associated with mortality in older Japanese patients with dysphagia · 2025 · DOI

  • Further studies are needed to investigate the association between PNI and mortality in different populations, - Research on the correlation between PNI and other biomarkers is required, - Studies on the impact of PNI on hospital length of stay (LOS) are necessary

    Prognostic nutritional index negative associated with mortality in older Japanese patients with dysphagia · 2025 · DOI

  • Further studies are needed to investigate the mechanisms underlying the association between PNI and mortality outcomes. Research should focus on the development of personalized nutritional interventions based on PNI values. Studies should explore the applicability of PNI in different populations and clinical settings.

    Association of prognostic nutritional index with all-cause mortality and cardiovascular mortality: a nationwide population-based cohort study · 2025 · DOI

  • Critical gaps remain in understanding the PNI and its link to mortality in the general adult population. Most studies focus on specific groups, raising concerns about PNI's applicability in the U.S. population.

    Association of prognostic nutritional index with all-cause mortality and cardiovascular mortality: a nationwide population-based cohort study · 2025 · DOI

  • the studies included had varying methodological quality, - 125 records were excluded after full-text assessment, - the search was limited to five electronic databases, - the analysis was based on published studies from 2012-2024

    Association between malnutrition diagnosed by different screening and assessment tools and clinical outcomes: an umbrella review · 2025 · DOI

  • The lack of a comprehensive review of the associations between malnutrition and clinical outcomes using meta-analyses. The need to identify the tools with high evidence scores that are highly recommended for diagnosing malnutrition. The confusion caused by different malnutrition diagnosis and assessment tools among clinicians and nursing staff.

    Association between malnutrition diagnosed by different screening and assessment tools and clinical outcomes: an umbrella review · 2025 · DOI

  • The study is retrospective, - The sample size is limited to 1,244 patients, - The study only includes patients from two cohorts, - The study does not account for potential confounding variables

    The relationship between elderly nutritional risk index and short-term all-cause mortality in critically ill patients with cerebral injury: a retrospective cohort study from two cohorts · 2025 · DOI

  • Further studies are needed to validate the GNRI in different populations, - Research should investigate the optimal nutritional intervention strategies, - Studies should examine the relationship between GNRI and long-term outcomes, - Investigation of the GNRI in other critically ill patient populations

    The relationship between elderly nutritional risk index and short-term all-cause mortality in critically ill patients with cerebral injury: a retrospective cohort study from two cohorts · 2025 · DOI

  • The diagnosis of malnutrition is challenging in patients with OSCC. Traditional indicators of malnutrition may not be adequate in OSCC patients. The study had a limited number of cases, which may affect the generalizability of the results.

    Nutritional factors and survival in a cohort of patients with oral cancer · 2025 · DOI

  • The two groups were not comparable, - The control group had a higher prevalence of less severe cases, - The study had a limited number of cases, - The study was retrospective

    Nutritional factors and survival in a cohort of patients with oral cancer · 2025 · DOI

  • Investigate the effects of specific nutritional interventions on sarcopenia and treatment outcomes. Examine the prognostic value of sarcopenia in other types of cancer. Develop strategies to prevent or mitigate excessive skeletal muscle loss during cancer treatment.

    Impact of skeletal muscle loss and sarcopenia on outcomes of neoadjuvant immunochemotherapy in esophageal squamous cell carcinoma · 2025 · DOI

  • The prognostic relevance of sarcopenia in esophageal cancer remains debated. There is a need to identify novel predictive markers that are more cost-effective and reliable than PD-L1. The impact of dynamic changes in skeletal muscle during treatment on neoadjuvant immunochemotherapy efficacy and prognosis is not well understood.

    Impact of skeletal muscle loss and sarcopenia on outcomes of neoadjuvant immunochemotherapy in esophageal squamous cell carcinoma · 2025 · DOI

  • Targeted educational interventions to enhance caregivers' nutritional knowledge, - Studies on the effects of nutritional management on functionally disabled older adults, - Research on the relationship between caregiver burden and nutritional management

    Knowledge, attitudes, and practices of caregivers of functionally disabled older adults regarding nutritional management · 2025 · DOI

  • The associations between erythrocyte levels of n-3 polyunsaturated fatty acids and incidence of frailty remain unknown. The pathophysiological mechanisms leading to frailty are not fully understood.

    Erythrocyte levels of n-3 polyunsaturated fatty acids and incidence of frailty after a 6-year follow-up: the Korean frailty and aging cohort study · 2025 · DOI

  • The study used a convenient sampling method, - The study had a limited geographic scope, focusing on one urban and one rural community in Chengdu, China

    Prevalence of mild cognitive impairment and its association with malnutrition in older Chinese adults in the community · 2024 · DOI

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350 open questions have been extracted from the limitations and future-work passages of 1,162 Nutrition and Health in Aging 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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