Lever
Lifestyle
- Ensure adequate sleep
- Manage stress effectively
- Regular physical activity
Blutwerte · Marker
Ghrelin
Acyl Ghrelin · Hungerhormon · Growth Hormone Secretagogue
Adipokine & Metabolische HormoneNüchtern erforderlichZeitabhängig
- Einheit:
- pg/mL
Ghrelin measures the concentration of the hunger hormone, which regulates appetite and energy balance.
Reference Ranges
Reference
0.5–2pg/mL
0.5
2
LowNormalHigh
Reference
Unit · pg/mLLevels fluctuate with meals and time of day; fasting measurements are recommended.
Overview
Übersicht
Ghrelin, a peptide hormone composed of 28 amino acids, is primarily recognized for its role as a ligand for the growth hormone secretagogue receptor (GHSR). It is predominantly produced in the stomach and is involved in stimulating the release of growth hormone from the pituitary gland. Biologically, ghrelin is a key regulator of energy balance, influencing appetite and food intake by signaling hunger to the brain. It also plays roles in gastric acid secretion, gastric motility, and insulin secretion. Clinically, ghrelin levels are of interest due to their association with metabolic conditions. Elevated ghrelin levels have been linked to increased hunger and appetite, contributing to obesity, especially in the context of sleep deprivation. Conversely, low levels may be associated with conditions such as anorexia and cachexia. In the realm of athletic performance and biohacking, ghrelin is of interest for its potential impact on body composition and energy regulation. Athletes and biohackers may monitor ghrelin to optimize energy intake and expenditure, potentially influencing body weight and muscle mass. However, ghrelin levels can be influenced by various factors, including sleep patterns, nutritional status, and time of day. Researchers have found that ghrelin levels typically rise before meals and fall after eating, making fasting and time-of-day considerations important for accurate measurement. Additionally, stress and sleep deprivation can artificially elevate ghrelin levels, confounding interpretation.
Klinische Bedeutung
Elevated ghrelin levels are associated with increased hunger and potential weight gain, often seen in sleep-deprived individuals. Reduced levels may indicate conditions like anorexia or cachexia.
Dynamics
Trend Interpretation
Rising Values
Progressively rising ghrelin levels suggest increased hunger and potential weight gain; consider re-evaluating lifestyle factors.
Falling Values
Falling ghrelin levels may indicate improved appetite control or potential underlying conditions like obesity.
Re-test Interval
4 weeks if outside optimal range
Etiology
Causes — High & Low
Cause
Elevated Levels
- Sleep deprivation
- Chronic stress
- Fasting
- Prader-Willi syndrome
- Anorexia nervosa
Cause
Low Levels
- Obesity
- Postprandial state
- Bariatric surgery
- Hypothyroidism
- Cachexia
Protocol
How to Optimize
Lever
Nutrition
- Balanced meals with protein
- Regular meal timing
- Avoid excessive fasting
Note:
Consult a healthcare provider for personalized advice, especially if considering significant dietary changes.
Testing Guidelines
🍽️Fasting Required
🕐Time-Sensitive
Ghrelin levels peak before meals; morning fasting samples are preferred.
Testing Frequency
Annually for general monitoring, more frequently if managing metabolic conditions.
Interfering Factors
- Recent eating
- Stress levels
- Sleep quality
Related Markers
Related Peptides & Hormones
Leptin
hormoneCorrelated with
Open Research Questions
Current research suggests that the reference ranges and optimal targets for ghrelin levels in various populations, particularly in relation to sleep and obesity, remain poorly defined. Researchers have not yet established the confounding factors that may influence ghrelin levels, such as age, sex, and metabolic status. Additionally, clinical questions regarding the therapeutic potential of ghrelin modulation in obesity management and its role in cancer progression remain unanswered.
33 Research Publications
2,929
Total Citations
11
Human/RCT
8.6
Avg. Influence
2024
Latest
Sort
Filter
01Top
#01
Metabolic consequences of sleep and sleep loss.
ReviewInfluence26.0
801
This study examined the relationship between sleep duration and metabolic health. Researchers found that reduced sleep is linked to hormonal changes that increase appetite, specifically higher levels of ghrelin and lower levels of leptin, contributing to obesity and type 2 diabetes risk.
02Top
#02
Role of sleep and sleep loss in hormonal release and metabolism.
ReviewInfluence10.0
560
This chapter reviewed the impact of sleep loss on metabolic health. Researchers observed that chronic sleep restriction increases ghrelin levels and decreases leptin levels, leading to increased hunger and a potential rise in obesity rates.
03Top
#03
Sleep and obesity.
ReviewInfluence13.0
542
This review summarized recent findings on the connection between sleep and obesity. Researchers found that decreased sleep duration and poor sleep quality are associated with increased ghrelin levels, decreased leptin levels, and heightened hunger, contributing to obesity risk.
04
#04
Towards frailty biomarkers: Candidates from genes and pathways regulated in aging and age-related diseases.
ReviewInfluence13.0
432
This study aimed to identify potential frailty biomarkers. Researchers included ghrelin in a proposed biomarker panel for frailty, suggesting its relevance in assessing health risks in aging populations.
05
#05
Effects of acute sleep loss on leptin, ghrelin, and adiponectin in adults with healthy weight and obesity: A laboratory study.
HumanInfluence1.0
87
This study investigated the effects of acute sleep deprivation on hormone levels in adults. Researchers observed that sleep loss resulted in lower leptin levels and higher ghrelin levels, particularly among individuals with obesity. These hormonal changes may contribute to weight gain if they persist over time.
06
#06
Nutritional Status and Its Detection in Patients with Inflammatory Bowel Diseases.
ReviewInfluence6.0
83
Researchers found an association between plasma ghrelin levels and nutritional status in patients with inflammatory bowel diseases (IBDs). Malnutrition in these patients is linked to increased risks of complications, highlighting the importance of monitoring ghrelin levels as part of nutritional assessments.
07
#07
Ghrelin and cancer progression.
ReviewInfluence4.0
78
This review focused on the role of ghrelin in cancer progression. Researchers found that ghrelin is involved in various physiological processes and may influence cancer metastasis and proliferation, indicating its potential clinical significance in cancer outcomes.
08
#08
Ghrelin and Neurodegenerative Disorders-a Review.
Shi Limin, et al. · Molecular neurobiology · 2017
Review
71
This review discussed ghrelin's role in neurodegenerative disorders. Researchers found that changes in ghrelin levels may be linked to disease progression in conditions like Alzheimer's and Parkinson's, suggesting its potential as a biomarker for these disorders.
Key findings
- 01Ghrelin is involved in higher brain functions, including memory and mood.
- 02Changes in ghrelin levels are linked to the progression of neurodegenerative diseases.
- 03Ghrelin may serve as a potential biomarker for clinical diagnosis and therapy in these disorders.
09
#09
Molecular Mechanisms and Health Benefits of Ghrelin: A Narrative Review.
Review
58
This narrative review summarized the various roles of ghrelin in metabolic regulation, inflammation, and stress response. Researchers highlighted the need for more comprehensive studies to fully understand ghrelin's mechanisms and its potential clinical significance.
10
#10
Chronic Circadian Disruption and Sleep Restriction Influence Subjective Hunger, Appetite, and Food Preference.
Human
45
This study investigated the effects of chronic circadian disruption on hunger and appetite. Researchers found that changes in the ghrelin/leptin ratio were significantly correlated with alterations in subjective hunger and appetite among participants.
Clinical Trials (10)
10
Total Trials
1,549
Total Enrolled
Salivary Apelin, Chemerin, Ghrelin, and Lipocalin-2 Levels in Diabetic Patients With Periodontitis
NCT07703345RECRUITING
Sponsor
Necmettin Erbakan University
Enrollment
88
Started
2026
Primary outcome
Salivary apelin, chemerin, ghrelin, and lipocalin-2 levels
PeriodontitisType 2 Diabetes Mellitus (T2DM)
The Role of Transcutaneous Vagus Nerve Stimulation in Treatment of Acute Brain Injury
NCT07384845NOT_YET_RECRUITING
Sponsor
Clinical Hospital Centre Zagreb
Enrollment
60
Started
2026
Primary outcome
Biomarkers of traumatic brain injury (S100B, neuron-specific enolase, GFAP) and ghrelin
Acute Brain InjuryTranscutaneous Vagus Nerve StimulationNeuromodulationImmunomodulation
Impact of FTO Gene Variation on Body Composition, Lipid Profile, Insulin Resistance, Advanced Glycation End-Products and Ghrelin Levels in Response to Hypocaloric, Protein Rich-Diet
NCT06426017COMPLETED
Sponsor
Khyber Medical University Peshawar
Enrollment
110
Started
2024
Primary outcome
Body Composition
ObesityInsulin ResistanceDyslipidemiasAdvance GlycationInflammation
The Gastric HormonE BioMarkers of Preneoplastic Lesions Study
NCT06085677UNKNOWN
Sponsor
Imperial College London
Enrollment
600
Started
2023
Primary outcome
Serologic concentrations of ghrelin, gastrin, pepsinogens and vitamin B12
Stomach NeoplasmChronic Atrophic GastritisIntestinal Metaplasia
Circulating Ghrelin as a Biomarker for Dementia
NCT05381090COMPLETED
Sponsor
Swansea University
Enrollment
85
Started
2022
Primary outcome
Ghrelin ratio in PD and PDD
Dementia
Effect of a Ghrelin Receptor Agonist on Muscle and Bone
Sponsor
Tufts University
Enrollment
32
Started
2019
Primary outcome
Total Body Muscle Mass
SarcopeniaOsteopenia
Stevia Rebaudiana Bertoni on Levels of GCF Glucose and Bio-markers in Diabetics.
Sponsor
SVS Institute of Dental Sciences
Enrollment
19
Started
2019
Primary outcome
Bio-marker (Ghrelin) levels in Gingival crevicular fluid.
Periodontitis
Ghrelin and Obestatin in CKD Children
NCT03171116COMPLETED
Sponsor
Azienda Ospedaliero Universitaria Maggiore della Carita
Enrollment
154
Started
2013
Primary outcome
AG concentrations by ELISA kit on plasma samples
Chronic Kidney Diseases
Octreotide Therapy in Children and Young Adults With Prader-Willi Syndrome (PWS)
NCT00399893TERMINATED
Sponsor
Duke University
Enrollment
5
Started
2006
Primary outcome
Number of Participants With Decrease in Fasting Total Ghrelin
Prader-Willi Syndrome
Effects Of An Oral Growth Hormone Secretagogue In Older Functionally Limited Adults
Sponsor
Pfizer
Enrollment
396
Started
1999
Primary outcome
Percent increase in lean (non fat) body mass.
AgingFrail Older Adults
Publication Trend
Research publications about Ghrelin over time
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