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Related Experiment Video

Updated: May 30, 2026

Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing

Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing

Published on: October 15, 2019

Intestinal microbiota and overweight.

A Lyra¹, S Lahtinen, K Tiihonen

¹Danisco Sweeteners, Health and Nutrition, Sokeritehtaantie 20, 02460 Kantvik, Finland. anna.lyra@danisco.com

Beneficial Microbes

|August 12, 2011

Summary

Gut microbes impact body weight by influencing energy extraction and cellular processes. While specific microbial markers for obesity remain unclear, research confirms microbes contribute to weight gain and associated metabolic diseases.

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Published on: July 31, 2019

Area of Science:

Microbiology
Human Health
Metabolic Syndrome

Background:

Gut microbiota plays a role in host energy metabolism, influencing weight through carbohydrate degradation and cellular energy status.
Studies indicate differences in the gastrointestinal microbiota composition between lean and overweight/obese individuals.
Initial research suggested a link between obesity and altered ratios of bacterial phyla, specifically decreased Bacteroidetes and increased Firmicutes.

Purpose of the Study:

To review the current understanding of the association between gastrointestinal microbiota and overweight/obesity.
To identify the challenges in determining specific microbial markers for obesity.
To highlight the contribution of gut microbes to weight gain and related metabolic disorders.

Main Methods:

Review of molecular methods used to study the gastrointestinal microbiota in relation to weight.
Analysis of findings from multiple studies assessing microbial alterations in overweight and obese subjects.
Consideration of factors contributing to discrepancies in research results, including methodological issues and microbiota complexity.

Main Results:

Contradictory results exist regarding the association of specific bacterial groups with weight, indicating difficulty in identifying consistent microbial markers.
The gastrointestinal microbiota is a complex, dynamic, and highly subject-specific ecosystem, complicating direct correlations with weight.
Despite inconsistencies, a clear contribution of microbes to weight gain and associated health issues like metabolic syndrome and type II diabetes is evident.

Conclusions:

It is premature to pinpoint specific bacterial groups as definitive indicators of overweight or obesity.
Gut microbes are significant contributors to weight gain and related metabolic diseases.
Continued research is crucial to identify common microbial markers for obesity and explore modulation strategies using probiotics and prebiotics for health promotion.