The most balanced answer is this: tirzepatide is better for patients who need a proven and available treatment now, while retatrutide may turn out to be the more powerful molecule if future trials continue to support the early data
Similarly, a high-fat diet has been shown to induce dysbiosis in gut microbiota, subsequently leading to reduced expression of mucus and tight junction proteins in the colon, triggering local and systemic inflammation [109, 110]
Drucker agreed that these newer drugs do not meaningfully penetrate the brain, but Secher, Rinaman, and others have shown they do meaningfully signal to many regions deep within the brain
Discovery of GLP-1-Based Drugs for the Treatment of Obesity
Some of the earlier GLP-1 compounds appear to access the brain more readily than semaglutide, Kanoski says
& Kumar, R