title: Breath hydrogen produced by ingestion of commercial hydrogen water and milk.
abstract: OBJECTIVE
  To compare how and to what extent ingestion of hydrogen water and milk increase breath hydrogen in adults.
  
  
  METHODS
  Five subjects without specific diseases, ingested distilled or hydrogen water and milk as a reference material that could increase breath hydrogen. Their end-alveolar breath hydrogen was measured.
  
  
  RESULTS
  Ingestion of hydrogen water rapidly increased breath hydrogen to the maximal level of approximately 40 ppm 10-15 min after ingestion and thereafter rapidly decreased to the baseline level, whereas ingestion of the same amount of distilled water did not change breath hydrogen (p < 0.001). Ingestion of hydrogen water increased both hydrogen peaks and the area under the curve (AUC) of breath hydrogen in a dose-dependent manner. Ingestion of milk showed a delayed and sustained increase of breath hydrogen in subjects with milk intolerance for up to 540 min. Ingestion of hydrogen water produced breath hydrogen at AUC levels of 2 to 9 ppm hour, whereas milk increased breath hydrogen to AUC levels of 164 ppm hour for 540 min after drinking.
  
  
  CONCLUSIONS
  Hydrogen water caused a rapid increase in breath hydrogen in a dose-dependent manner; however, the rise in breath hydrogen was not sustained compared with milk.
authors: Department of Etiology and Pathogenesis, National Cardiovascular Center Research Institute, Japan.
authors: Akito
authors: A
authors: Shimouchi
authors: Kazutoshi
authors: K
authors: Nose
authors: Makoto
authors: M
authors: Yamaguchi
authors: Hiroshi
authors: H
authors: Ishiguro
authors: Takaharu
authors: T
authors: Kondo