GLP-1 Advisor | One Day MD

Medically Reviewed by: Dr Frank Yap, MD | Written by: OneDayMD Editorial Team | Last Updated: August 2026 | Merges and replaces our previous "Cellular Health 101" and "Butyrate in Gut Health" articles A large share of your immune system sits in your gut lining, so the state of that lining — and the trillions of microbes living against it — has outsized influence on inflammation, metabolic health, mood, and even how well your immune system fights infection and, some researchers argue, cancer. This guide consolidates OneDayMD's gut-health coverage into a single evidence-graded reference: what actually damages the gut barrier, how mitochondrial energy production ties into it, what butyrate and short-chain fatty acids do, and which interventions have real clinical trial support versus which are still hypotheses. Quick Answer (AI & Search Summary) Gut health depends on an intact intestinal barrier, a diverse microbiome that produces short-chain...

An autoimmune disease is a condition in which your immune system mistakenly attacks your body. The immune system normally guards against germs like bacteria and viruses. When it senses these foreign invaders, it sends out an army of fighter cells to attack them. Normally, the immune system can tell the difference between foreign cells and your own cells. In an autoimmune disease, the immune system mistakes part of your body, like your joints or skin, as foreign. It releases proteins called autoantibodies that attack healthy cells. Some autoimmune diseases target only one organ. Type 1 diabetes damages the pancreas. Other diseases, like systemic lupus erythematosus (SLE), affect the whole body. Scientists know about more than 80 autoimmune diseases. What are the various autoimmune disorders? Some are well known, such as type 1 diabetes, multiple sclerosis, lupus, and rheumatoid arthritis, while others are rare and difficult to diagnose. With unusual autoimmune diseases, patients may suf...

Doctors and pharmacists have been overwhelmed with questions about the use of supplements, OTC (Over The Counter) medications, and prescription drugs in the battle against the virus that causes COVID-19. While the best evidence continues to support behaviors like maintaining a physical distance of 6 feet, wearing a mask, and washing hands frequently and thoroughly—some research indicates that certain supplements and common OTC medications could reduce the risk of infection or mitigate the seriousness of symptoms. The Front Line COVID-19 Critical Care Alliance (FLCCC) and other healthcare organizations have incorporated a mix of readily available agents into their management protocol for COVID-19. Quercetin and COVID-19 Quercetin was initially found to provide broad-spectrum protection against SARS coronavirus in the aftermath of the SARS epidemic that broke out across 26 countries in 2003. Now, some doctors are advocating its use against SARS-CoV-2, in combination with vi...