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Open research questions in Regulation of Appetite and Obesity

362 gap statements mined from Regulation of Appetite and Obesity papers in our 7.9M-paper local library, which holds 1,574 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • Sympathetic overactivation promotes inguinal fat browning via β3-adrenergic signaling, yet full UCP1 induction remains incomplete; thus, this adaptive response is insufficient to prevent obesity.

    Metabolic changes following relief of upper airway obstruction promote rebound weight gain in mice · 2026 · DOI

  • While a strong epidemiological connection was made between obesity and increased risk for BC, the molecular mechanisms are not fully elucidated.

    Leptin Drives Breast Cancer Aggressiveness Acting Through the Activation of the NCOA1/STAT3 Pathway · 2026 · DOI

  • Likewise, it remains unclear how fasting, as a metabolic stimulus that directly affects PVN neurons, and subsequent refeeding influence the neural activity of specific cell populations within this circuit. However, the effects of chronic stress and long-term palatable food intake on the neural activation of this circuit have not been investigated.

    Homeostatic and Hedonic Signals Differentially Regulate cFos Activation in PVN MC4R, PVN pro-TRH, PBN vGlut2, and PBN CRF Neuronal Populations · 2026 · DOI

  • Future research should focus on elucidating the mechanisms of deacylated ghrelin and GHS-R1b to expand therapeutic Zhang et al. GHS-R1b can also penetrate the brain through passive diffusion; however, its mode of action and effects within the central nervous system remain unknown.

    Potential role of ghrelin in neuroprotection and cognitive function: implications for diabetic cognitive impairment · 2025 · DOI

  • In parallel, the detailed molecular mechanism of the GnIH action should be investigated to explore its potential as a therapeutic target. Currently, there is insufficient evidence for the direct action of GnIH via its receptors, other than the fact that GnIH/GnIH-Rs are expressed in the peripheral metabolic tissues.

    Metabolic Regulation by the Hypothalamic Neuropeptide, Gonadotropin-Inhibitory Hormone at Both the Central and Peripheral Levels · 2025 · DOI

  • While much remains to be tested to ascertain the full extent of hunger and satiety-related impairments across these diverse conditions, there is evidence, stronger in some cases weaker in others, that supports a linkage between MTL integrity, declarative learning and memory function, and hunger and satiety.

    Hunger, Satiety, and Their Vulnerabilities · 2024 · DOI

  • One challenge is the limited success of current strategies to treat obesity. Another challenge is the need for new bioactive compounds with satiating capacity. A technical challenge is the measurement of postprandial blood ghrelin levels in rats.

    Anti-Obesity Effects of a Collagen with Low Digestibility and High Swelling Capacity: A Human Randomized Control Trial · 2024 · DOI

  • Current strategies to treat obesity have limited success. There is a need for new bioactive compounds with satiating capacity to improve dietary treatments. The effects of collagen on obesity in humans are not well understood.

    Anti-Obesity Effects of a Collagen with Low Digestibility and High Swelling Capacity: A Human Randomized Control Trial · 2024 · DOI

  • It highlights the need for further research on the effects of GLP-2 on gastrointestinal motor activity and peripheral satiety signals. The paper suggests that a better understanding of GLP-2's role could lead to the development of new treatments for obesity.

    The Possible Involvement of Glucagon-like Peptide-2 in the Regulation of Food Intake through the Gut–Brain Axis · 2024 · DOI

  • There is a need to understand the biological responses to nutritional changes in geese. The study aims to fill this gap by examining the effects of fasting and refeeding on blood biochemical indicators and transcriptional profiles in geese.

    Investigating the Impact of Fasting and Refeeding on Blood Biochemical Indicators and Transcriptional Profiles in the Hypothalamus and Subcutaneous Adipose Tissue in Geese · 2024 · DOI

  • Major Depressive Disorder (MDD) has a complex, bi-directional relationship with metabolic dysfunction, yet the neural correlates of this association are not well understood.

    Leptin’s Inverse Association With Brain Morphology and Depressive Symptoms: A Discovery and Confirmatory Study Across 2 Independent Samples · 2024 · DOI

  • The main limitation of the current study was the relatively smaller sample size of Balkhi sheep (n = 60).

    Association of polymorphisms in the ovine Leptin gene with body weight and body measurement traits in Balkhi sheep · 2026 · DOI

  • Future studies validating these observations are warranted through preclinical models and examining possible pharmacological strategies.

    Leptin Drives Breast Cancer Aggressiveness Acting Through the Activation of the NCOA1/STAT3 Pathway · 2026 · DOI

  • However, only gene expression was measured, so the underlying mechanisms remain unclear.

    Differential effects of L-alanine, L-glutamine, L-arginine HCl, and glycine on feed intake and hypothalamic appetite-related responses in layer-type chicks · 2026 · DOI

  • Ghrelin is a key regulator of energy homeostasis, yet its behavior during the hypoglycemic phase of the oral glucose tolerance test (OGTT) remains poorly characterized.

    Ghrelin responses to oral glucose and reactive hypoglycemia across BMI categories · 2026 · DOI

  • Reactive hypoglycemia (RH) is increasingly recognized across the spectrum of adiposity; however, little is known about whether ghrelin changes measured during an OGTT differ across BMI categories in individuals with RH.

    Ghrelin responses to oral glucose and reactive hypoglycemia across BMI categories · 2026 · DOI

  • However, functional studies that have only measured the effect of MRAP2 variants on MC4R-mediated cAMP signaling have produced inconsistent findings and most do not reduce MC4R function.

    Obesity-associated MRAP2 variants impair multiple MC4R-mediated signaling pathways · 2025 · DOI

  • Understanding the underlying mechanisms that contribute to the success of bariatric surgery remains an active research area. The interplay between bariatric surgery, weight loss, physical exercise, leptin, and ghrelin is not well understood.

    Possible Interaction Between Physical Exercise and Leptin and Ghrelin Changes Following Roux-en-Y Gastric Bypass in Sarcopenic Obesity Patients—A Pilot Study · 2024 · DOI

  • Ghrelin reactive antibodies are present in healthy subjects and altered in individuals with eating disorders but its regulation by diet has not been explored.

    Ghrelin Reactive Antibodies Levels Differ Between Individuals Following a Plant Based or Omnivorous Diet · 2024 · DOI

  • While the pathogenesis of depression has been extensively studied, the mechanisms underlying appetite suppression in depression remain poorly understood.

    MicroRNA-124–3p regulates NPY to affect appetite in individuals with depressive disorder · 2025 · DOI

  • Studies must determine whether retatrutide modulates central inflammatory and neuroimmune pathways through GLP-1 and GIP receptor engagement in appetite-regulating brain regions.

    Metabolic inflammation at the adipose-brain axis · 2026 · DOI

  • Research examining the association between stress and leptin remains relatively scarce.

    Occupational Stress and Altered Serum Leptin Among Female Workers in Southern Brazil · 2026 · DOI

  • Although the precise molecular pathways remain unclear, we confirmed reduced expression of Pth1r in eWAT and iWAT of ob/ob mice, which may impair PTH…

    Parathyroid hormone enhances appetite and fails to reduce adiposity in ob/ob mice · 2026 · DOI

  • Targeting the gut microbiota might represent a strategy to counteract overweight, - A better understanding of the possible role of GLP-2 in regulating food intake through the gut-brain axis could represent a starting point for the development of new strategies to treat some pathological…

    The Possible Involvement of Glucagon-like Peptide-2 in the Regulation of Food Intake through the Gut–Brain Axis · 2024 · DOI

  • Further studies are needed to explore the impact of exercise on leptin and ghrelin levels in patients with sarcopenic obesity, - Research should investigate the long-term effects of exercise on weight loss maintenance and metabolic improvements, - Studies should examine the optimal exercise program for patients with sarcopenic obesity after bariatric…

    Possible Interaction Between Physical Exercise and Leptin and Ghrelin Changes Following Roux-en-Y Gastric Bypass in Sarcopenic Obesity Patients—A Pilot Study · 2024 · DOI

Most-cited papers in Regulation of Appetite and Obesity

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Open questions raised by papers listed on this page include: (1) While a strong epidemiological connection was made between obesity and increased risk for BC, the molecular mechanisms are not fully elucidated (“Leptin Drives Breast Cancer Aggressiveness Acting Through the Activation of the…”, 2026); (2) It remains unclear how fasting, as a metabolic stimulus that directly affects PVN neurons, and subsequent refeeding influence the neural activity of specific cell populations within this circuit (“Homeostatic and Hedonic Signals Differentially Regulate cFos Activation in PVN…”, 2026); (3) Only gene expression was measured, so the underlying mechanisms remain unclear (“Differential effects of L-alanine, L-glutamine, L-arginine HCl, and glycine on…”, 2026); (4) Reactive hypoglycemia (RH) is increasingly recognized across the spectrum of adiposity; however, little is known about whether ghrelin changes measured during an OGTT differ across BMI categories in individuals with RH (“Ghrelin responses to oral glucose and reactive hypoglycemia across BMI…”, 2026); (5) While the pathogenesis of depression has been extensively studied, the mechanisms underlying appetite suppression in depression remain poorly understood (“MicroRNA-124–3p regulates NPY to affect appetite in individuals with depressive…”, 2025). 362 gap statements have been mined from Regulation of Appetite and Obesity papers in our 7.9M-paper local library, which holds 1,574 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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