Hydrogen as a Potential Therapeutic in Obesity: Targeting the Brain.
肥満における分子状水素の潜在的役割：脳内標的メカニズムの考察
Abstract
Molecular hydrogen (H2) has been associated with favorable changes in obesity-related metabolic biomarkers in peripheral tissues; however, its direct influence on central nervous system pathways involved in obesity remains unclear. This review article examines several molecular targets located in the hypothalamus and adjacent brain regions that may be modulated by H2 gas in the context of obesity. The author outlines plausible mechanistic pathways through which H2 could interact with central regulatory systems governing energy balance and metabolic homeostasis.
Mechanism
H2 gas may modulate multiple molecular targets in the hypothalamus and surrounding brain regions, potentially influencing central regulatory pathways involved in energy balance and obesity-related metabolic signaling.
Bibliographic
- Authors
- Ostojic SM
- Journal
- Trends Endocrinol Metab
- Year
- 2021
- PMID
- 33485760
- DOI
- 10.1016/j.tem.2021.01.002
Tags
Delivery context
In air, molecular hydrogen is reported to be combustible across approximately **4% (LFL, lower flammability limit) to 75% (UFL, upper flammability limit)**. Among high-concentration hydrogen inhalers, 66% output sits inside this range, and even pure-hydrogen (100%) output forms a 4–75% concentration-gradient layer at the device–air boundary (the UFL 75% paradox). Engineering principle would therefore call for operation below LFL (the classical 4%); that figure, however, was measured under closed, pre-mixed, static conditions. For the open, dynamic inhalation environment, the empirical value reported in the literature is **10%**, which is the figure referenced in practice as the operating ceiling. The 66% / 100% output devices are recorded in the Japanese Consumer Affairs Agency accident-information database, and from these considerations are not recommended.
Safety notes
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