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Gut microbiota: a factor in energy regulation
1Department of Nutritional Sciences and Toxicology, University of California, Berkeley, California, USA. nutritionreviews@ilsi.org
Nutrition Reviews
|February 24, 2006
Summary
The gut microbiota helps conventional mice gain more calories and fat by breaking down plant fibers and boosting fat storage. This highlights the crucial role of gut bacteria in regulating host energy.
Area of Science:
- Microbiology
- Physiology
- Nutrition Science
Background:
- Intestinal bacteria play a role in host energy metabolism.
- Germ-free and conventional animal models are used to study microbiota effects.
- Gut microbiota influences the digestion of complex carbohydrates.
Purpose of the Study:
- To investigate the role of intestinal bacterial populations in host energy uptake and fat deposition.
- To compare energy metabolism in germ-free and conventional mice.
Main Methods:
- Comparative analysis of germ-free and conventional mice.
- Assessment of bacterial hydrolysis of plant polysaccharides.
- Measurement of lipoprotein lipase activity and its inhibitors.
Main Results:
- Conventional mice exhibited increased calorie provision from indigestible plant polysaccharides.
- Gut microbiota suppressed a circulating inhibitor of lipoprotein lipase, increasing its activity.
- Conventional mice showed significantly greater body fat deposition compared to germ-free mice.
Conclusions:
- Intestinal microbiota is essential for hydrolyzing plant polysaccharides into absorbable calories.
- Gut bacteria regulate host fat deposition by modulating lipoprotein lipase activity.
- The gut microbiota acts as a key regulator of energy uptake and storage in a symbiotic relationship with the host.