The presence of Christensenella (Bacillota, in class Clostridia), isolated from human faeces, has been found to correlate with lower body mass index.

Faecalibacterium prausnitzii (F. prausnitzii) is a member of the Bacillota phylum that may have anti-inflammatory effects in humans. This species is associated with reduced low-grade inflammation in obesity. Additionally, patients with