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Their profound effect on weight loss has resulted in widespread use of these medicines for treating obesity. Extensive studies have shown that GLP-1s decrease body weight, lean mass, and other metabolic phenotypes. These studies were supported by the mechanism of signaling pathways of GLP-1s in cells and their metabolic effects. Recently, studies have focused on the effect of GLP-1s on the brain, showing that they affect food cognition, depression, drug addiction, and even neurodegenerative diseases. Although recent studies have investigated the impact of GLP-1s on the brain, our understanding of these effects is limited. This review describes how GLP-1s have become the most effective drugs in obesity, such as their known signaling pathway in cells and their pharmaceutical processing over the years. 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