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Antibiotics

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Oral antibiotics are tied to colorectal cancer (CRC). Researchers matched over 28,000 patients with CRC found in the Clinical Practice Research Datalink database with controls. Results showed that CRC risk depends on antibiotic type and location in the colon, but overall, CRC risk was dose dependent with any antibiotic use. Antibiotics with anti-anaerobic activity, which disrupts the gut microbiome in a way that allows carcinogenic microbes to develop, posed the greatest risk, especially in the proximal colon. These antibiotics include penicillin (ampicillin and amoxicillin). Interestingly, antibiotics showed a protective effect against rectal cancers, specifically in doses of more than 60 days of antibiotic exposure when compared to no antibiotic exposure. While the study was funded by Johns Hopkins Fisher Center Discovery Center and Bloomberg-Kimmel Institute for Cancer Immunotherapy, the study reported indirect competing interests, including receiving financial support from pharmaceutical companies. Gut Takeaway: While these results do not prove a…

Hilary didn’t have a history of lots of antibiotic use in the past, but she was a picky eater in childhood who avoided fruits and vegetables like the plague. She was now in her thirties and in good health until a case of severe gastroenteritis, with nausea, vomiting, fever, and dehydration led to a five-day hospitalization. The cause of the gastroenteritis was never identified, but because she had a fever, while in the hospital she was treated with two different intravenous antibiotics and discharged on an additional ten-day course of oral antibiotics. Hilary felt better by the time she completed the antibiotics, but three months after the hospitalization she developed mushy stool that she described as having an oatmeal consistency, as well as severe bloating. Upper endoscopy and colonoscopy were unrevealing, and biopsies were negative for celiac disease, microscopic colitis, or any other abnormalities. A month later Hilary was prescribed…

Glenn had been on various antibiotics for cystic acne for seventeen years. His skin would initially respond well, but after a year or two the cystic lesions would return, and his dermatologist would switch him to a different antibiotic. Ten years after he first started taking antibiotics Glenn began to have persistent loose stools and weight loss. He experimented with cutting out dairy and tried to increase his calories, but no matter what he ate, he still had diarrhea and trouble gaining weight. Evaluation of his digestive tract eventually revealed a diagnosis of celiac disease, and he was put on a gluten free diet (GFD), which he adhered to strictly. His doctor reassured Glenn that after a few months on the GFD his diarrhea and weight loss would improve, but two years later nothing had changed. Repeat evaluation showed the signs of celiac disease had completely resolved, and his small…

Antibiotic therapy disrupts the gut microbiome and results in a pro-inflammatory response that negatively affects bone health. Previous studies have uncovered the direct relationship between a balanced microbiome and healthy bone development. A February 2019 study took this relationship further and investigated the use of a broad-spectrum antibiotic in mice to determine if there were any microbiome-mediated alterations in skeletal formation on a cellular level. After administering antibiotic therapy during the post-puberty phase (this phase is responsible for 40% of our bone accumulation), researchers found that the antibiotics led to significant disruptions in gut bacteria that altered the communication between immune cells and bone cells. These alterations led to substantial changes to trabecular bone – the bone type that experiences high rates of bone metabolism. The American Journal of Pathology  Takeaway: Antibiotics, especially broad-spectrum ones, significantly alter the gut microbiome, which may have negative and lasting effects on skeletal health. Researchers hope to conduct…

While we are never quick to recommend antibiotics at Gutbliss, they can definitely be life saving in certain situations – and when deadly bacteria don’t respond to antibiotics, there can be grave consequences. Antibiotic resistance is a growing issue in the medical field; research that sheds light on how some bacteria evade antibiotics can’t come quickly enough. Luckily, scientists at the University of California San Diego conducted a study that helps us answer the question of how some bacteria survive antibiotic treatment. UCSD researchers found that bacteria can regulate the uptake of alkaline metal (magnesium specifically) ions to stabalize their ribosomes – the very foundations of survival on a cellular level, which transform genes into proteins – to survive antibiotic attacks. With this new and surprising finding, scientists hope to alter current antibiotic drugs and increase their potency by controlling how bacteria take up magnesium, to fight against this unique bacterial…