Calories aren’t enough to correct malnourishment, but eating foods that spur specific microbes to grow in the gut can.

Animal studies and a few small clinical trials show it’s possible to get commensal microbes to protect against bone loss, rather than contribute to it.

Research in mice and humans is beginning to establish a link between the composition of microbes in the gut and immune responses to tumor cells, but the mechanisms are not yet clear.

The microbiomes of men who have sex with men are associated with greater immune system activation and promote elevated rates of viral infection in vitro.

The gut microbiome has been linked to depression, schizophrenia, and other neurological conditions, but it’s not yet clear whether the relationship is causal.

An experiment delves into how the microbiome shapes immunity.

Molecules produced by resident bacteria and their hosts may signal immune cells to attack the body’s own tissues.

Antigens originating from the microbiome may trigger an autoimmune response.

Scientists map the presence of Helicobacter pylori in the stomach of mice, showing where the bacteria colonize the gastric glands.