How Is the Microbiome Involved in Obesity

How is the microbiome involved in obesity?

A) Lean people have fewer Firmicutes than obese people.
B) Obese people have fewer Firmicutes than lean people.
C) Obese people are able to extract more calories from their food because of their Firmicutes.
D) Lean people have fewer Firmicutes than obese people, and obese people are able to extract more calories from their food because of their Firmicutes.
E) Obese people have fewer Firmicutes than lean people, and they are able to extract more calories from their food because of their Firmicutes.