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This source of methane is technically known as enteric fermentation.

"We found that the opioid signaling pathway is required for the developmental formation of nerves in the gut, an understudied part of the body called the enteric nervous system," Uribe said.

Research suggests that apple cider vinegar delays stomach emptying so perhaps increased time in contact with stomach acid might account for the claimed protective effect against enteric infections.

For example, in 2021, deaths from enteric diseases were largely concentrated in sub-Saharan Africa and South Asia.

They also did a computer study to learn more about how the antibacterial peptides kill Salmonella Typhi and other enteric pathogens.