Dose-Dependent Effects of Intranasal Insulin on Resting-State Brain Activity
Open accessAbstract
Context: Insulin action in the human brain influences eating behavior, cognition, and whole-body metabolism. Studies investigating brain insulin rely on intranasal application. Objective: To investigate effects of three doses of insulin and placebo as nasal sprays on the central and autonomous nervous system and analyze absorption of insulin into the bloodstream. Design, Participants, and Methods: Nine healthy men received placebo or 40 U, 80 U, and 160 U insulin spray in randomized order. Before and after spray, brain activity was assessed by functional magnetic resonance imaging, and heart rate variability (HRV) was assessed from electrocardiogram. Plasma insulin, C-peptide, and glucose were measured regularly. Setting: General community. Results: Nasal insulin administration dose-dependently modulated regional brain activity and the normalized high-frequency component of the HRV. Post hoc analyses revealed that only 160 U insulin showed a considerable difference from placebo. Dose-dependent spillover of nasal insulin into the bloodstream was detected. The brain response was not correlated with this temporary rise in circulating insulin. Conclusions: Nasal insulin dose-dependently modulated regional brain activity with the strongest effects after 160 U. However, this dose was accompanied by a transient increase in circulating insulin concentrations due to a spillover into circulation. Our current results may serve as a basis for future studies with nasal insulin to untangle brain insulin effects in health and disease.
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In previous placebo-controlled assessments, the placebo nasal spray did not impact hypothalamic blood flow.
“However, in our previous placebo-controlled assessments6,8,39 (see Supplementary Material 2 for more details), the placebo nasal spray did not impact hypothalamic blood flow.”
From Brain insulin action on peripheral insulin sensitivity in women depends on menstrual cycle phase (2023) · cites this paper as [6]
Using nasal delivery, only a tiny fraction of insulin reaches the bloodstream.
“while only a tiny fraction reaches the bloodstream6”
From Brain insulin action on peripheral insulin sensitivity in women depends on menstrual cycle phase (2023) · cites this paper as [6]
The used dose of 160 U resulted in substantial effects on brain activity, comparable to oral glucose ingestion, and has been widely used in previous trials on acute brain effects of insulin.
“Despite the lack of data on the exact amount of insulin reaching the brain, previous trials found that the used dose of 160 U resulted in substantial effects on brain activity6,7, comparable to oral glucose ingestion, and this dose has been widely used in previous trials on acute brain effects of insulin38.”
From Brain insulin action on peripheral insulin sensitivity in women depends on menstrual cycle phase (2023) · cites this paper as [6]
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Intranasal Insulin Administration Does Not Affect LH Concentrations in Men with Diabetes
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Circulating epigenetic signatures classifying brain insulin resistance in humans
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Self-citationIntranasal delivery of insulin: An update on status quo and challenges for diabetes treatment
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Self-citationIntranasal insulin therapy in the treatment of alzheimer’s disease – A narrative review
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Closed-loop individual EEG neurofeedback of appetite interventions: a conceptual framework
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Effect of Intranasal Insulin on Cognitive Function in Diabetic Patients
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Protein and peptide delivery through respiratory pathway
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Das Gehirn als Schlüsselorgan der Stoffwechselregulation
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Self-citation
- Authors
- Kullmann, S., Veit, R., Peter, A., Pohmann, R., Scheffler, K., Häring, H.-U., Fritsche, A., Preissl, H., & Heni, M.
- Affiliations
- German Center for Diabetes Research (DE)
- Max Planck Institute for Biological Cybernetics (DE)
- Helmholtz Munich (DE)
- Corresponding author
- Heni, Martin
- ORCID
- Venue
- The Journal of Clinical Endocrinology & Metabolism
- Publisher
- The Endocrine Society
- Published
- 2017-10-31
- Volume
- 103
- Issue
- 1
- Pages
- 253-262
- ISSN
- 0021-972X (ISSN-L)
- 1945-7197
- OpenAlex
- W2766902973
- Cited by
- 78
- References
- 39
- Citations by year
- 2026: 11 · 2025: 10 · 2024: 10 · 2023: 12 · 2022: 10 · 2021: 6 · 2020: 9 · 2019: 7 · 2018: 3
- FWCI
- 4.10
- Type
- journal article
- Language
- en
- Open access
- Licence
- other-oa
- Locations
- The Journal of Clinical Endocrinology & Metabolism (publishedVersion)
- PubMed (publishedVersion)
- Max Planck Digital Library (submittedVersion)
- Site cant be reached (submittedVersion, other-oa)
- MPG.PuRe (Max Planck Society) (submittedVersion)
- PuSH - Publication Server of Helmholtz Zentrum München (submittedVersion)
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
- Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
- Keywords
- intranasal insulin, brain insulin, resting-state brain activity, dose-dependent effects, heart rate variability, plasma insulin, C-peptide, glucose, functional MRI, healthy men
- MeSH terms
- Administration, Intranasal, Adult, Blood Glucose, Brain, Cognition, Dose-Response Relationship, Drug, Follow-Up Studies, Heart Rate, Humans, Hypoglycemic Agents, Insulin, Magnetic Resonance Imaging, Male, Prognosis, Young Adult, Nasal Sprays
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