In the brain, GLP-1 receptors are found in regions integral to appetite regulation, including the hypothalamus, brainstem, and reward-processing areas such as the nucleus accumbens and ventral tegmental area
A study published in August 2025 found that lean muscle mass loss via a mouse model was less than previous studies had reported, and also found that a good portion of the And research presented at the European Congress on Obesity (ECO 2025) reported that adults taking GLP-1 drugs were able to retain muscle while losing weight by strength training and eating enough protein
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In consideration of the multiple metabolic and cardiovascular effects seen in subjects treated with GLP-1RAs and SGLT-2is (e.g., reduction of hyperglycemia, weight loss, free/fat mass and bone remodeling, anti-atherosclerosis, natriuresis), it is reasonable to speculate that GH and IGF-1 may play a about a relevant role in this context
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