Document Detail

Effect of evening exposure to bright or dim light after daytime bright light on absorption of dietary carbohydrates the following morning.
MedLine Citation:
PMID:  20551588     Owner:  NLM     Status:  MEDLINE    
We had previously reported on the effect of exposure to light on the human digestive system: daytime bright light exposure has a positive effect, whereas, evening bright light exposure has a negative effect on the efficiency of dietary carbohydrate absorption from the evening meal. These results prompted us to examine whether the light intensity to which subjects are exposed in the evening affects the efficiency of dietary carbohydrate absorption the following morning. In this study, subjects were exposed to either 50 lux (dim light conditions) or 2,000 lux (bright light conditions) in the evening for 9 h (from 15:00 to 24:00) after staying under bright light in the daytime (under 2,000 lux from 07:00 to 15:00). We measured unabsorbed dietary carbohydrates using the breath-hydrogen test the morning after exposure to either bright light or dim light the previous evening. Results showed that there was no significant difference between the two conditions in the amount of breath hydrogen. This indicates that evening exposure to bright or dim light after bright light exposure in the daytime has no varying effect on digestion or absorption of dietary carbohydrates in the following morning's breakfast.
Naoko Hirota; Yoshiaki Sone; Hiromi Tokura
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of physiological anthropology     Volume:  29     ISSN:  1880-6805     ISO Abbreviation:  J Physiol Anthropol     Publication Date:  2010  
Date Detail:
Created Date:  2010-06-16     Completed Date:  2010-08-31     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101269653     Medline TA:  J Physiol Anthropol     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  79-83     Citation Subset:  IM    
Faculty of Human Health Science, Matsumoto University, Japan.
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MeSH Terms
Breath Tests
Dietary Carbohydrates / metabolism*
Digestion / physiology,  radiation effects*
Hydrogen / analysis
Intestinal Absorption / radiation effects
Postprandial Period / radiation effects
Young Adult
Reg. No./Substance:
0/Dietary Carbohydrates; 1333-74-0/Hydrogen

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