A new mouse study found that combining defatted rice bran with inulin, two dietary fibers, raised gut Bifidobacteria and the short-chain fatty acid butyrate more than either fiber alone, and modestly improved exploratory behavior in middle-aged female mice. The effect has only been shown in a small group of mice, and most memory and motor tests showed no difference between groups.
A new mouse study found that daily doses of the probiotic yeast Saccharomyces boulardii cut food intake by about 10% and significantly slowed weight gain in obese mice, alongside coordinated shifts in gut bacteria, gut chemistry, and immune signaling. The effect has only been shown in mice, with no pair-fed control group to rule out that eating less, not the yeast itself, explains the changes.
Researchers at Mayo Clinic, Harvard Medical School, and Colorado State University propose a new framework in Annals of Neurology: the gut wall acts as both a site of immune priming in multiple sclerosis and a direct target of autoimmune attack in related neurological diseases like NMOSD and anti-DPPX encephalitis.
A new Nature Microbiology study in mice finds that a toxin from enterotoxigenic Bacteroides fragilis (ETBF) kills the gut nerve cells that control digestion, causing lasting dysmotility. A second bacterium makes the damage worse, and a Bifidobacterium-based probiotic reversed it in mice.
A new Science Advances study found that urolithin A, a postbiotic your gut bacteria make from pomegranate and berry compounds, directly activates a heart-relaxation protein called PKGIα, improving cardiac function in mice with a hard-to-treat form of heart failure and in lab-grown human heart tissue. The findings are preclinical only, and whether your gut even produces urolithin A from pomegranates in the first place depends on which bacteria you host.
A new preprint tracked 25 rectal cancer patients before and after pre-surgery chemo and radiation. In patients whose tumors responded completely, two secondary bile acids fell while a beneficial gut byproduct, butyrate, rose, alongside shifts in immune-related blood genes. The study is small, unreviewed, and has no comparison group of poor responders, but its authors propose a gut bacteria - bile acid - immune chain that may help explain why some rectal tumors respond better to treatment than others.
A new critical review of 143 studies examines Lachnospiraceae, a common family of gut bacteria linked to immune regulation and cancer immunotherapy response. The mechanisms are well established in rodents, but most human evidence is correlational, and only one strain has cleared FDA review and real placebo-controlled trials, for blood sugar control, not cancer.
A new mechanistic study in mice and lab-grown stomach tissue traces the molecular relay, from a bacterial trigger through an immune signal to a hormone-like messenger, that pushes stomach lining cells into an abnormal, embryo-like growth state tied to the earliest steps toward gastric cancer. The work is entirely preclinical, but it identifies specific, potentially druggable switches in that process for the first time.
A new mouse study finds that both extreme low-salt and extreme high-salt diets disrupt gut bacteria and impair memory, through different biological routes tied to the gut-brain axis.
Mice bred to develop peanut allergy are completely missing lysozyme, an antimicrobial gut protein, before they ever encounter a peanut. Children with peanut allergy show a smaller version of the same deficiency in their own gut biopsies, a UNC-led study finds, though the human evidence so far is a small correlation, not proof.
